mirror of git://gcc.gnu.org/git/gcc.git
672 lines
25 KiB
Java
672 lines
25 KiB
Java
/* NamingManager.java -- Creates contexts and objects
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Copyright (C) 2000, 2001, 2002, 2003, 2004,
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2006 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package javax.naming.spi;
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import gnu.classpath.VMStackWalker;
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import gnu.java.lang.CPStringBuilder;
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import java.util.Enumeration;
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import java.util.Hashtable;
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import java.util.StringTokenizer;
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import javax.naming.CannotProceedException;
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import javax.naming.Context;
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import javax.naming.Name;
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import javax.naming.NamingException;
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import javax.naming.NoInitialContextException;
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import javax.naming.RefAddr;
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import javax.naming.Reference;
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import javax.naming.Referenceable;
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import javax.naming.StringRefAddr;
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/**
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* Contains methods for creating contexts and objects referred to by
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* location information. The location is specified in the scope of the
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* certain naming or directory service. This class only contais static
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* methods and cannot be instantiated.
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*/
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public class NamingManager
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{
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/**
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* The environment property into which getContinuationContext() stores the
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* value of the CannotProceedException parameter. The value of this field
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* is <i>java.naming.spi.CannotProceedException<i>.
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*/
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public static final String CPE = "java.naming.spi.CannotProceedException";
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private static InitialContextFactoryBuilder icfb;
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// Package private so DirectoryManager can access it.
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static ObjectFactoryBuilder ofb;
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// This class cannot be instantiated.
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NamingManager ()
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{
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}
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/**
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* Checks if the initial context factory builder has been set.
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*
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* @return true if the builder has been set
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*
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* @see #setInitialContextFactoryBuilder(InitialContextFactoryBuilder)
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*/
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public static boolean hasInitialContextFactoryBuilder ()
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{
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return icfb != null;
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}
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/**
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* Creates the initial context. If the initial object factory builder has
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* been set with {@link #setObjectFactoryBuilder(ObjectFactoryBuilder)},
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* the work is delegated to this builder. Otherwise, the method searches
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* for the property Context.INITIAL_CONTEXT_FACTORY first in the passed
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* table and then in the system properties. The value of this property is
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* uses as a class name to install the context factory. The corresponding
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* class must exist, be public and have the public parameterless constructor.
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*
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* @param environment the properties, used to create the context.
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*
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* @return the created context
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*
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* @throws NoInitialContextException if the initial builder is not set,
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* the property Context.INITIAL_CONTEXT_FACTORY is missing of the
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* class, named by this property, cannot be instantiated.
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* @throws NamingException if throws by the context factory
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*/
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public static Context getInitialContext (Hashtable<?, ?> environment)
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throws NamingException
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{
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InitialContextFactory icf = null;
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if (icfb != null)
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icf = icfb.createInitialContextFactory(environment);
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else
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{
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String java_naming_factory_initial = null;
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if (environment != null)
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java_naming_factory_initial
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= (String) environment.get (Context.INITIAL_CONTEXT_FACTORY);
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if (java_naming_factory_initial == null)
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java_naming_factory_initial =
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System.getProperty (Context.INITIAL_CONTEXT_FACTORY);
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if (java_naming_factory_initial == null)
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throw new
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NoInitialContextException ("Can't find property: "
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+ Context.INITIAL_CONTEXT_FACTORY);
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try
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{
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icf = (InitialContextFactory)Class.forName
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(java_naming_factory_initial, true,
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Thread.currentThread().getContextClassLoader())
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.newInstance ();
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}
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catch (Exception exception)
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{
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NoInitialContextException e
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= new NoInitialContextException
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("Can't load InitialContextFactory class: "
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+ java_naming_factory_initial);
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e.setRootCause(exception);
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throw e;
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}
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}
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return icf.getInitialContext (environment);
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}
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/**
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* <p>
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* Creates the URL context for the given URL scheme id.
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* </p>
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* <p>
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* The class name of the factory that creates the context has the naming
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* pattern scheme-idURLContextFactory. For instance, the factory for the "ftp"
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* sheme should be named "ftpURLContextFactory".
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* </p>
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* <p>
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* The Context.URL_PKG_PREFIXES environment property contains the
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* colon-separated list of the possible package prefixes. The package name is
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* constructed concatenating the package prefix with the scheme id. This
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* property is searched in the passed <i>environment</i> parameter and later
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* in the system properties.
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* </p>
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* <p>
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* If the factory class cannot be found in the specified packages, system will
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* try to use the default internal factory for the given scheme.
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* </p>
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* <p>
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* After the factory is instantiated, its method
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* {@link ObjectFactory#getObjectInstance(Object, Name, Context, Hashtable)}
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* is called to create and return the object instance.
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*
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* @param refInfo passed to the factory
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* @param name passed to the factory
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* @param nameCtx passed to the factory
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* @param scheme the url scheme that must be supported by the given context
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* @param environment the properties for creating the factory and context (may
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* be null)
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* @return the created context
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* @throws NamingException if thrown by the factory when creating the context.
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*/
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static Context getURLContext(Object refInfo, Name name, Context nameCtx,
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String scheme, Hashtable<?,?> environment)
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throws NamingException
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{
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// Doc specifies com.sun.jndi.url as the final destination, but we cannot
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// put our classes into such namespace.
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String defaultPrefix = "gnu.javax.naming.jndi.url";
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// The final default location, as specified in the documentation.
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String finalPrefix = "com.sun.jndi.url";
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CPStringBuilder allPrefixes = new CPStringBuilder();
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String prefixes;
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if (environment != null)
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{
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prefixes = (String) environment.get(Context.URL_PKG_PREFIXES);
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if (prefixes != null)
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allPrefixes.append(prefixes);
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}
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prefixes = System.getProperty(Context.URL_PKG_PREFIXES);
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if (prefixes != null)
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{
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if (allPrefixes.length() > 0)
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allPrefixes.append(':');
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allPrefixes.append(prefixes);
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}
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if (allPrefixes.length() > 0)
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allPrefixes.append(':');
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allPrefixes.append(defaultPrefix);
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allPrefixes.append(':');
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allPrefixes.append(finalPrefix);
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scheme = scheme + "." + scheme + "URLContextFactory";
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StringTokenizer tokens = new StringTokenizer(allPrefixes.toString(), ":");
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while (tokens.hasMoreTokens())
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{
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String aTry = tokens.nextToken();
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try
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{
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String tryClass = aTry + "." + scheme;
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Class factoryClass = forName(tryClass);
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if (factoryClass != null)
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{
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Object obj;
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try
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{
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ObjectFactory factory = (ObjectFactory) factoryClass.newInstance();
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obj = factory.getObjectInstance(refInfo, name, nameCtx,
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environment);
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Context ctx = (Context) obj;
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if (ctx != null)
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return ctx;
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}
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catch (RuntimeException e)
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{
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// TODO Auto-generated catch block
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e.printStackTrace();
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}
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}
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}
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catch (ClassNotFoundException _1)
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{
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// Ignore it.
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}
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catch (ClassCastException _2)
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{
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// This means that the class we found was not an
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// ObjectFactory or that the factory returned something
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// which was not a Context.
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}
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catch (InstantiationException _3)
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{
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// If we couldn't instantiate the factory we might get
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// this.
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}
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catch (IllegalAccessException _4)
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{
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// Another possibility when instantiating.
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}
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catch (NamingException _5)
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{
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throw _5;
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}
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catch (Exception _6)
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{
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// Anything from getObjectInstance.
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}
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}
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return null;
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}
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/**
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* Load the class with the given name. This method tries to use the context
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* class loader first. If this fails, it searches for the suitable class
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* loader in the caller stack trace. This method is a central point where all
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* requests to find a class by name are delegated.
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*/
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static Class forName(String className)
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{
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try
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{
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return Class.forName(className, true,
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Thread.currentThread().getContextClassLoader());
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}
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catch (ClassNotFoundException nex)
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{
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/**
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* Returns the first user defined class loader on the call stack, or
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* null when no non-null class loader was found.
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*/
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Class[] ctx = VMStackWalker.getClassContext();
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for (int i = 0; i < ctx.length; i++)
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{
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// Since we live in a class loaded by the bootstrap
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// class loader, getClassLoader is safe to call without
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// needing to be wrapped in a privileged action.
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ClassLoader cl = ctx[i].getClassLoader();
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try
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{
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if (cl != null)
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return Class.forName(className, true, cl);
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}
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catch (ClassNotFoundException nex2)
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{
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// Try next.
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}
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}
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}
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return null;
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}
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/**
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* <p>
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* Creates the URL context for the given URL scheme id.
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* </p>
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* <p>
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* The class name of the factory that creates the context has the naming
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* pattern scheme-idURLContextFactory. For instance, the factory for the
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* "ftp" scheme should be named "ftpURLContextFactory".
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* The Context.URL_PKG_PREFIXES environment property contains the
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* colon-separated list of the possible package prefixes. The package name
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* is constructed by concatenating the package prefix with the scheme id.
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* </p>
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* <p>
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* If the factory class cannot be found in the specified packages, the
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* system will try to use the default internal factory for the given scheme.
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* </p>
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* <p>
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* After the factory is instantiated, its method
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* {@link ObjectFactory#getObjectInstance(Object, Name, Context, Hashtable)}
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* is called to create and return the object instance.
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*
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* @param scheme the url scheme that must be supported by the given context
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* @param environment the properties for creating the factory and context
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* (may be null)
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* @return the created context
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* @throws NamingException if thrown by the factory when creating the
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* context.
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*/
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public static Context getURLContext (String scheme,
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Hashtable<?, ?> environment)
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throws NamingException
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{
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return getURLContext (null, null, null, scheme, environment);
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}
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/**
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* Sets the initial object factory builder.
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*
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* @param builder the builder to set
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*
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* @throws SecurityException if the builder cannot be installed due
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* security restrictions.
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* @throws NamingException if the builder cannot be installed due other
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* reasons
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* @throws IllegalStateException if setting the builder repeatedly
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*/
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public static void setObjectFactoryBuilder (ObjectFactoryBuilder builder)
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throws NamingException
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{
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SecurityManager sm = System.getSecurityManager ();
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if (sm != null)
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sm.checkSetFactory ();
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// Once the builder is installed it cannot be replaced.
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if (ofb != null)
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throw new IllegalStateException ("object factory builder already installed");
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if (builder != null)
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ofb = builder;
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}
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static StringTokenizer getPlusPath (String property, Hashtable env,
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Context nameCtx)
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throws NamingException
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{
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String path = (String) env.get (property);
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if (nameCtx == null)
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nameCtx = getInitialContext (env);
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String path2 = (String) nameCtx.getEnvironment ().get (property);
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if (path == null)
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path = path2;
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else if (path2 != null)
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path += ":" + path2;
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return new StringTokenizer (path != null ? path : "", ":");
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}
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/**
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* <p>Creates an object for the specified name context, environment and
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* referencing context object.</p>
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* <p>
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* If the builder factory is set by
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* {@link #setObjectFactoryBuilder(ObjectFactoryBuilder)}, the call is
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* delegated to that factory. Otherwise, the object is created using the
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* following rules:
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* <ul>
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* <li>If the referencing object (refInfo) contains the factory class name,
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* the object is created by this factory. If the creation fails,
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* the parameter refInfo is returned as the method return value.</li>
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* <li>If the referencing object has no factory class name, and the addresses
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* are StringRefAddrs having the address type "URL", the object is
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* created by the URL context factory. The used factory corresponds the
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* the naming schema of the each URL. If the attempt to create
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* the object this way is not successful, the subsequent rule is
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* tried.</li>
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* <li> If the refInfo is not an instance of Reference or Referencable
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* (for example, null), the object is created by the factories,
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* specified in the Context.OBJECT_FACTORIES property of the
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* environment and the provider resource file, associated with the
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* nameCtx. The value of this property is the colon separated list
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* of the possible factories. If none of the factories can be
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* loaded, the refInfo is returned.
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* </ul>
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* </p>
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* <p>The object factory must be public and have the public parameterless
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* constructor.</p>
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*
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* @param refInfo the referencing object, for which the new object must be
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* created (can be null). If not null, it is usually an instance of
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* the {@link Reference} or {@link Referenceable}.
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* @param name the name of the object. The name is relative to
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* the nameCtx naming context. The value of this parameter can be
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* null if the name is not specified.
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* @param nameCtx the naming context, in which scope the name of the new
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* object is specified. If this parameter is null, the name is
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* specified in the scope of the initial context.
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* @param environment contains additional information for creating the object.
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* This paramter can be null if there is no need to provide any
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* additional information.
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*
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* @return the created object. If the creation fails, in some cases
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* the parameter refInfo may be returned.
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*
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* @throws NamingException if the attempt to name the new object has failed
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* @throws Exception if the object factory throws it. The object factory
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* only throws an exception if it does not want other factories
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* to be used to create the object.
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*/
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public static Object getObjectInstance (Object refInfo,
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Name name,
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Context nameCtx,
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Hashtable<?, ?> environment)
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throws Exception
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{
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ObjectFactory factory = null;
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if (ofb != null)
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factory = ofb.createObjectFactory (refInfo, environment);
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else
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{
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// First see if we have a Reference or a Referenceable. If so
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// we do some special processing.
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Object ref2 = refInfo;
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if (refInfo instanceof Referenceable)
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ref2 = ((Referenceable) refInfo).getReference ();
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if (ref2 instanceof Reference)
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{
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Reference ref = (Reference) ref2;
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// If we have a factory class name then we use that.
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String fClass = ref.getFactoryClassName ();
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if (fClass != null)
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{
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// Exceptions here are passed to the caller.
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Class k = Class.forName (fClass,
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true,
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Thread.currentThread().getContextClassLoader());
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factory = (ObjectFactory) k.newInstance ();
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}
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else
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{
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// There's no factory class name. If the address is a
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// StringRefAddr with address type `URL', then we try
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// the URL's context factory.
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Enumeration e = ref.getAll ();
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while (e.hasMoreElements ())
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{
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RefAddr ra = (RefAddr) e.nextElement ();
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if (ra instanceof StringRefAddr
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&& "URL".equals (ra.getType ()))
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{
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factory
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= (ObjectFactory) getURLContext (refInfo,
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name,
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nameCtx,
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(String) ra.getContent (),
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environment);
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Object obj = factory.getObjectInstance (refInfo,
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name,
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nameCtx,
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environment);
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if (obj != null)
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return obj;
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}
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}
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// Have to try the next step.
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factory = null;
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}
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}
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// Now look at OBJECT_FACTORIES to find the factory.
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if (factory == null)
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{
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StringTokenizer tokens = getPlusPath (Context.OBJECT_FACTORIES,
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environment, nameCtx);
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while (tokens.hasMoreTokens ())
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{
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String klassName = tokens.nextToken ();
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Class k = Class.forName (klassName,
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true,
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Thread.currentThread().getContextClassLoader());
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factory = (ObjectFactory) k.newInstance ();
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Object obj = factory.getObjectInstance (refInfo, name,
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nameCtx, environment);
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if (obj != null)
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return obj;
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}
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// Failure.
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return refInfo;
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}
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}
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|
|
|
if (factory == null)
|
|
return refInfo;
|
|
Object obj = factory.getObjectInstance (refInfo, name,
|
|
nameCtx, environment);
|
|
return obj == null ? refInfo : obj;
|
|
}
|
|
|
|
/**
|
|
* Sets the initial context factory builder.
|
|
*
|
|
* @param builder the builder to set
|
|
*
|
|
* @throws SecurityException if the builder cannot be installed due
|
|
* security restrictions.
|
|
* @throws NamingException if the builder cannot be installed due other
|
|
* reasons
|
|
* @throws IllegalStateException if setting the builder repeatedly
|
|
*
|
|
* @see #hasInitialContextFactoryBuilder()
|
|
*/
|
|
public static void setInitialContextFactoryBuilder
|
|
(InitialContextFactoryBuilder builder)
|
|
throws NamingException
|
|
{
|
|
SecurityManager sm = System.getSecurityManager ();
|
|
if (sm != null)
|
|
sm.checkSetFactory ();
|
|
// Once the builder is installed it cannot be replaced.
|
|
if (icfb != null)
|
|
throw new IllegalStateException ("ctx factory builder already installed");
|
|
if (builder != null)
|
|
icfb = builder;
|
|
}
|
|
|
|
/**
|
|
* Creates a context in which the context operation must be continued.
|
|
* This method is used by operations on names that span multiple namespaces.
|
|
*
|
|
* @param cpe the exception that triggered this continuation. This method
|
|
* obtains the environment ({@link CannotProceedException#getEnvironment()}
|
|
* and sets the environment property {@link #CPE} = cpe.
|
|
*
|
|
* @return a non null context for continuing the operation
|
|
*
|
|
* @throws NamingException if the naming problems have occured
|
|
*/
|
|
public static Context getContinuationContext (CannotProceedException cpe)
|
|
throws NamingException
|
|
{
|
|
Hashtable env = cpe.getEnvironment ();
|
|
if (env != null)
|
|
env.put (CPE, cpe);
|
|
|
|
// TODO: Check if this implementation matches the API specification
|
|
try
|
|
{
|
|
Object obj = getObjectInstance (cpe.getResolvedObj(),
|
|
cpe.getAltName (),
|
|
cpe.getAltNameCtx (),
|
|
env);
|
|
if (obj != null)
|
|
return (Context) obj;
|
|
}
|
|
catch (Exception _)
|
|
{
|
|
}
|
|
|
|
// fix stack trace for re-thrown exception (message confusing otherwise)
|
|
cpe.fillInStackTrace();
|
|
|
|
throw cpe;
|
|
}
|
|
|
|
/**
|
|
* Get the object state for binding.
|
|
*
|
|
* @param obj the object, for that the binding state must be retrieved. Cannot
|
|
* be null.
|
|
* @param name the name of this object, related to the nameCtx. Can be null if
|
|
* not specified.
|
|
* @param nameCtx the naming context, to that the object name is related. Can
|
|
* be null if the name is related to the initial default context.
|
|
* @param environment the properties for creating the object state. Can be
|
|
* null if no properties are provided.
|
|
* @return the object state for binding, may be null if no changes are
|
|
* returned by the factory
|
|
* @throws NamingException
|
|
*/
|
|
public static Object getStateToBind (Object obj, Name name,
|
|
Context nameCtx, Hashtable<?, ?> environment)
|
|
throws NamingException
|
|
{
|
|
StringTokenizer tokens = getPlusPath (Context.STATE_FACTORIES,
|
|
environment, nameCtx);
|
|
while (tokens.hasMoreTokens ())
|
|
{
|
|
String klassName = tokens.nextToken ();
|
|
try
|
|
{
|
|
Class k = Class.forName (klassName,
|
|
true,
|
|
Thread.currentThread().getContextClassLoader());
|
|
StateFactory factory = (StateFactory) k.newInstance ();
|
|
Object o = factory.getStateToBind (obj, name, nameCtx,
|
|
environment);
|
|
if (o != null)
|
|
return o;
|
|
}
|
|
catch (ClassNotFoundException _1)
|
|
{
|
|
// Ignore it.
|
|
}
|
|
catch (ClassCastException _2)
|
|
{
|
|
// This means that the class we found was not an
|
|
// ObjectFactory or that the factory returned something
|
|
// which was not a Context.
|
|
}
|
|
catch (InstantiationException _3)
|
|
{
|
|
// If we couldn't instantiate the factory we might get
|
|
// this.
|
|
}
|
|
catch (IllegalAccessException _4)
|
|
{
|
|
// Another possibility when instantiating.
|
|
}
|
|
}
|
|
|
|
return obj;
|
|
}
|
|
}
|