mirror of git://gcc.gnu.org/git/gcc.git
442 lines
14 KiB
Java
442 lines
14 KiB
Java
/* gnu.java.beans.IntrospectionIncubator
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Copyright (C) 1998, 2004 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 gnu.java.beans;
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import gnu.java.lang.ArrayHelper;
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import gnu.java.lang.ClassHelper;
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import java.beans.BeanInfo;
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import java.beans.EventSetDescriptor;
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import java.beans.IndexedPropertyDescriptor;
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import java.beans.IntrospectionException;
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import java.beans.Introspector;
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import java.beans.MethodDescriptor;
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import java.beans.PropertyDescriptor;
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import java.lang.reflect.Array;
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import java.lang.reflect.Method;
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import java.lang.reflect.Modifier;
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import java.util.Enumeration;
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import java.util.Hashtable;
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import java.util.Vector;
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/**
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** IntrospectionIncubator takes in a bunch of Methods, and
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** Introspects only those Methods you give it.<br/>
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**
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** See {@link addMethod(Method)} for details which rules apply to
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** the methods.
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**
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** @author John Keiser
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** @author Robert Schuster
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** @see gnu.java.beans.ExplicitBeanInfo
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** @see java.beans.BeanInfo
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**/
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public class IntrospectionIncubator {
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Hashtable propertyMethods = new Hashtable();
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Hashtable listenerMethods = new Hashtable();
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Vector otherMethods = new Vector();
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Class propertyStopClass;
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Class eventStopClass;
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Class methodStopClass;
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public IntrospectionIncubator() {
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}
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/** Examines the given method and files it in a suitable collection.
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* It files the method as a property method if it finds:
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* <ul>
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* <li>boolean "is" getter</li>
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* <li>"get" style getter</li>
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* <li>single argument setter</li>
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* <li>indiced setter and getter</li>
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* </ul>
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* It files the method as a listener method if all of these rules apply:
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* <ul>
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* <li>the method name starts with "add" or "remove"</li>
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* <li>there is only a single argument</li>
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* <li>the argument type is a subclass of <code>java.util.EventListener</code></li>
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* </ul>
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* All public methods are filed as such.
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*
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* @param method The method instance to examine.
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*/
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public void addMethod(Method method) {
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if(Modifier.isPublic(method.getModifiers())) {
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String name = ClassHelper.getTruncatedName(method.getName());
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Class retType = method.getReturnType();
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Class[] params = method.getParameterTypes();
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boolean isVoid = retType.equals(java.lang.Void.TYPE);
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Class methodClass = method.getDeclaringClass();
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/* Accepts the method for examination if no stop class is given or the method is declared in a subclass of the stop class.
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* The rules for this are described in {@link java.beans.Introspector.getBeanInfo(Class, Class)}.
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* This block finds out whether the method is a suitable getter or setter method (or read/write method).
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*/
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if(isReachable(propertyStopClass, methodClass)) {
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/* At this point a method may regarded as a property's read or write method if its name
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* starts with "is", "get" or "set". However, if a method is static it cannot be part
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* of a property.
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*/
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if(Modifier.isStatic(method.getModifiers())) {
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// files method as other because it is static
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otherMethods.addElement(method);
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} else if(name.startsWith("is")
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&& retType.equals(java.lang.Boolean.TYPE)
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&& params.length == 0) {
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// files method as boolean "is" style getter
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addToPropertyHash(name,method,IS);
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} else if(name.startsWith("get") && !isVoid) {
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if(params.length == 0) {
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// files as legal non-argument getter
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addToPropertyHash(name,method,GET);
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} else if(params.length == 1 && params[0].equals(java.lang.Integer.TYPE)) {
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// files as legal indiced getter
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addToPropertyHash(name,method,GET_I);
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} else {
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// files as other because the method's signature is not Bean-like
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otherMethods.addElement(method);
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}
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} else if(name.startsWith("set") && isVoid) {
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if(params.length == 1) {
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// files as legal single-argument setter method
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addToPropertyHash(name,method,SET);
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} else if(params.length == 2 && params[0].equals(java.lang.Integer.TYPE)) {
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// files as legal indiced setter method
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addToPropertyHash(name,method,SET_I);
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} else {
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// files as other because the method's signature is not Bean-like
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otherMethods.addElement(method);
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}
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}
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}
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if(isReachable(eventStopClass, methodClass)) {
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if(name.startsWith("add")
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&& isVoid
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&& params.length == 1
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&& java.util.EventListener.class.isAssignableFrom(params[0])) {
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addToListenerHash(name,method,ADD);
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} else if(name.startsWith("remove")
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&& isVoid
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&& params.length == 1
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&& java.util.EventListener.class.isAssignableFrom(params[0])) {
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addToListenerHash(name,method,REMOVE);
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}
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}
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if(isReachable(methodStopClass, methodClass)) {
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// files as reachable public method
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otherMethods.addElement(method);
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}
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}
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}
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public void addMethods(Method[] m) {
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for(int i=0;i<m.length;i++) {
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addMethod(m[i]);
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}
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}
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public void setPropertyStopClass(Class c) {
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propertyStopClass = c;
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}
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public void setEventStopClass(Class c) {
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eventStopClass = c;
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}
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public void setMethodStopClass(Class c) {
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methodStopClass = c;
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}
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public BeanInfoEmbryo getBeanInfoEmbryo() throws IntrospectionException {
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BeanInfoEmbryo b = new BeanInfoEmbryo();
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findXXX(b,IS);
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findXXXInt(b,GET_I);
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findXXXInt(b,SET_I);
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findXXX(b,GET);
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findXXX(b,SET);
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findAddRemovePairs(b);
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for(int i=0;i<otherMethods.size();i++) {
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MethodDescriptor newMethod = new MethodDescriptor((Method)otherMethods.elementAt(i));
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if(!b.hasMethod(newMethod)) {
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b.addMethod(new MethodDescriptor((Method)otherMethods.elementAt(i)));
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}
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}
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return b;
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}
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public BeanInfo getBeanInfo() throws IntrospectionException {
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return getBeanInfoEmbryo().getBeanInfo();
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}
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void findAddRemovePairs(BeanInfoEmbryo b) throws IntrospectionException {
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Enumeration listenerEnum = listenerMethods.keys();
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while(listenerEnum.hasMoreElements()) {
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DoubleKey k = (DoubleKey)listenerEnum.nextElement();
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Method[] m = (Method[])listenerMethods.get(k);
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if(m[ADD] != null && m[REMOVE] != null) {
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EventSetDescriptor e = new EventSetDescriptor(Introspector.decapitalize(k.getName()),
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k.getType(), k.getType().getMethods(),
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m[ADD],m[REMOVE]);
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e.setUnicast(ArrayHelper.contains(m[ADD].getExceptionTypes(),java.util.TooManyListenersException.class));
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if(!b.hasEvent(e)) {
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b.addEvent(e);
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}
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}
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}
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}
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void findXXX(BeanInfoEmbryo b, int funcType) throws IntrospectionException {
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Enumeration keys = propertyMethods.keys();
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while(keys.hasMoreElements()) {
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DoubleKey k = (DoubleKey)keys.nextElement();
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Method[] m = (Method[])propertyMethods.get(k);
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if(m[funcType] != null) {
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PropertyDescriptor p = new PropertyDescriptor(Introspector.decapitalize(k.getName()),
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m[IS] != null ? m[IS] : m[GET],
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m[SET]);
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if(m[SET] != null) {
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p.setConstrained(ArrayHelper.contains(m[SET].getExceptionTypes(),java.beans.PropertyVetoException.class));
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}
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if(!b.hasProperty(p)) {
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b.addProperty(p);
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}
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}
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}
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}
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void findXXXInt(BeanInfoEmbryo b, int funcType) throws IntrospectionException {
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Enumeration keys = propertyMethods.keys();
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while(keys.hasMoreElements()) {
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DoubleKey k = (DoubleKey)keys.nextElement();
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Method[] m = (Method[])propertyMethods.get(k);
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if(m[funcType] != null) {
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boolean constrained;
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if(m[SET_I] != null) {
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constrained = ArrayHelper.contains(m[SET_I].getExceptionTypes(),java.beans.PropertyVetoException.class);
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} else {
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constrained = false;
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}
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/** Find out if there is an array type get or set **/
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Class arrayType = Array.newInstance(k.getType(),0).getClass();
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DoubleKey findSetArray = new DoubleKey(arrayType,k.getName());
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Method[] m2 = (Method[])propertyMethods.get(findSetArray);
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IndexedPropertyDescriptor p;
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if(m2 == null) {
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p = new IndexedPropertyDescriptor(Introspector.decapitalize(k.getName()),
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null,null,
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m[GET_I],m[SET_I]);
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} else {
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if(constrained && m2[SET] != null) {
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constrained = ArrayHelper.contains(m2[SET].getExceptionTypes(),java.beans.PropertyVetoException.class);
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}
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p = new IndexedPropertyDescriptor(Introspector.decapitalize(k.getName()),
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m2[GET],m2[SET],
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m[GET_I],m[SET_I]);
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}
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p.setConstrained(constrained);
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if(!b.hasProperty(p)) {
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b.addProperty(p);
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}
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}
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}
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}
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static final int IS=0;
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static final int GET_I=1;
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static final int SET_I=2;
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static final int GET=3;
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static final int SET=4;
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static final int ADD=0;
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static final int REMOVE=1;
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void addToPropertyHash(String name, Method method, int funcType) {
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String newName;
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Class type;
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switch(funcType) {
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case IS:
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type = java.lang.Boolean.TYPE;
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newName = name.substring(2);
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break;
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case GET_I:
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type = method.getReturnType();
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newName = name.substring(3);
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break;
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case SET_I:
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type = method.getParameterTypes()[1];
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newName = name.substring(3);
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break;
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case GET:
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type = method.getReturnType();
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newName = name.substring(3);
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break;
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case SET:
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type = method.getParameterTypes()[0];
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newName = name.substring(3);
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break;
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default:
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return;
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}
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newName = capitalize(newName);
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if (newName.length() == 0)
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return;
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DoubleKey k = new DoubleKey(type,newName);
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Method[] methods = (Method[])propertyMethods.get(k);
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if(methods == null) {
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methods = new Method[5];
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propertyMethods.put(k,methods);
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}
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methods[funcType] = method;
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}
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void addToListenerHash(String name, Method method, int funcType) {
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String newName;
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Class type;
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switch(funcType) {
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case ADD:
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type = method.getParameterTypes()[0];
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newName = name.substring(3,name.length()-8);
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break;
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case REMOVE:
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type = method.getParameterTypes()[0];
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newName = name.substring(6,name.length()-8);
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break;
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default:
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return;
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}
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newName = capitalize(newName);
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if (newName.length() == 0)
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return;
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DoubleKey k = new DoubleKey(type,newName);
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Method[] methods = (Method[])listenerMethods.get(k);
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if(methods == null) {
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methods = new Method[2];
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listenerMethods.put(k,methods);
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}
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methods[funcType] = method;
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}
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/* Determines whether <code>stopClass</code> is <code>null</code>
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* or <code>declaringClass<code> is a true subclass of <code>stopClass</code>.
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* This expression is useful to detect whether a method should be introspected or not.
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* The rules for this are described in {@link java.beans.Introspector.getBeanInfo(Class, Class)}.
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*/
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static boolean isReachable(Class stopClass, Class declaringClass) {
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return stopClass == null || (stopClass.isAssignableFrom(declaringClass) && !stopClass.equals(declaringClass));
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}
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/** Transforms a property name into a part of a method name.
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* E.g. "value" becomes "Value" which can then concatenated with
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* "set", "get" or "is" to form a valid method name.
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*
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* Implementation notes:
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* If "" is the argument, it is returned without changes.
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* If <code>null</code> is the argument, <code>null</code> is returned.
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*
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* @param name Name of a property.
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* @return Part of a method name of a property.
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*/
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static String capitalize(String name) {
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try {
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if(Character.isUpperCase(name.charAt(0))) {
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return name;
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} else {
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char[] c = name.toCharArray();
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c[0] = Character.toLowerCase(c[0]);
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return new String(c);
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}
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} catch(StringIndexOutOfBoundsException E) {
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return name;
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} catch(NullPointerException E) {
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return null;
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}
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}
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}
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/** This class is a hashmap key that consists of a <code>Class</code> and a
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* <code>String</code> element.
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*
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* It is used for XXX: find out what this is used for
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*
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* @author John Keiser
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* @author Robert Schuster
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*/
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class DoubleKey {
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Class type;
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String name;
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DoubleKey(Class type, String name) {
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this.type = type;
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this.name = name;
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}
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Class getType() {
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return type;
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}
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String getName() {
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return name;
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}
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public boolean equals(Object o) {
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if(o instanceof DoubleKey) {
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DoubleKey d = (DoubleKey)o;
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return d.type.equals(type) && d.name.equals(name);
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} else {
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return false;
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}
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}
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public int hashCode() {
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return type.hashCode() ^ name.hashCode();
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}
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}
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