mirror of git://gcc.gnu.org/git/gcc.git
347 lines
8.8 KiB
Java
347 lines
8.8 KiB
Java
/* Bindings.java --
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Copyright (C) 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.xml.transform;
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import gnu.java.lang.CPStringBuilder;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.Iterator;
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import java.util.LinkedList;
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import java.util.Map;
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import javax.xml.namespace.QName;
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import javax.xml.xpath.XPathVariableResolver;
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import org.w3c.dom.Node;
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/**
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* The set of variable bindings in effect for a stylesheet.
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*
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* @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
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*/
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public class Bindings
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implements XPathVariableResolver, Cloneable
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{
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static final int VARIABLE = 0;
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static final int PARAM = 1;
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static final int WITH_PARAM = 2;
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final Stylesheet stylesheet;
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/**
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* Global variables.
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*/
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final LinkedList<Map<QName,Object>> variables;
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/**
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* Parameter value stack.
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*/
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final LinkedList<Map<QName,Object>> parameters;
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/**
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* Argument (with-param) value stack.
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*/
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final LinkedList<Map<QName,Object>> withParameters;
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/**
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* Only search globals.
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*/
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boolean global;
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Bindings(Stylesheet stylesheet)
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{
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this.stylesheet = stylesheet;
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variables = new LinkedList<Map<QName,Object>>();
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parameters = new LinkedList<Map<QName,Object>>();
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withParameters = new LinkedList<Map<QName,Object>>();
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for (int i = 0; i < 3; i++)
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{
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push(i);
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}
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}
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public Object clone()
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{
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try
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{
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return (Bindings) super.clone();
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}
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catch (CloneNotSupportedException e)
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{
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throw new Error(e.getMessage());
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}
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}
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void push(int type)
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{
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switch (type)
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{
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case VARIABLE:
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variables.addFirst(new HashMap<QName,Object>());
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break;
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case PARAM:
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parameters.addFirst(new HashMap<QName,Object>());
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break;
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case WITH_PARAM:
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withParameters.addFirst(new HashMap<QName,Object>());
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break;
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}
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}
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void pop(int type)
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{
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switch (type)
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{
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case VARIABLE:
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variables.removeFirst();
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break;
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case PARAM:
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parameters.removeFirst();
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break;
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case WITH_PARAM:
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withParameters.removeFirst();
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break;
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}
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}
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public boolean containsKey(QName name, int type)
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{
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if (global)
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{
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Map<QName,Object> ctx1 = variables.getLast();
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Map<QName,Object> ctx2 = parameters.getLast();
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return (ctx1.containsKey(name) || ctx2.containsKey(name));
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}
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Iterator<Map<QName,Object>> i = null;
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switch (type)
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{
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case VARIABLE:
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i = variables.iterator();
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break;
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case PARAM:
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i = parameters.iterator();
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break;
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case WITH_PARAM:
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Map<QName,Object> ctx = withParameters.getFirst();
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return ctx.containsKey(name);
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}
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if (i != null)
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{
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while (i.hasNext())
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{
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Map<QName,Object> ctx = i.next();
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if (ctx.containsKey(name))
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{
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return true;
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}
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}
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}
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return false;
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}
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public Object get(QName name, Node context, int pos, int len)
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{
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if (global)
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{
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Map<QName,Object> ctx = variables.getLast();
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Object ret = ctx.get(name);
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if (ret == null)
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{
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ctx = parameters.getLast();
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ret = ctx.get(name);
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}
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return ret;
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}
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//System.err.println("bindings.get: "+name);
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//System.err.println("\t"+toString());
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Object ret = null;
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//if (parameters.size() > 1 && containsKey(name, PARAM))
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// check that template defines parameter
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{
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Map<QName,Object> cwp = withParameters.getFirst();
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ret = cwp.get(name);
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//System.err.println("\twith-param: ret="+ret);
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}
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if (ret == null)
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{
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for (Iterator<Map<QName,Object>> i = variables.iterator();
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i.hasNext() && ret == null; )
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{
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Map<QName,Object> vctx = i.next();
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ret = vctx.get(name);
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}
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//System.err.println("\tvariable: ret="+ret);
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}
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if (ret == null)
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{
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for (Iterator<Map<QName,Object>> i = parameters.iterator();
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i.hasNext() && ret == null; )
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{
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Map<QName,Object> pctx = i.next();
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ret = pctx.get(name);
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}
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//System.err.println("\tparam: ret="+ret);
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}
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/*if (ret instanceof Expr && context != null)
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{
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Expr expr = (Expr) ret;
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ret = expr.evaluate(context, 1, 1);
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}*/
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if (ret instanceof Node)
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{
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ret = Collections.singleton(ret);
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}
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if (ret == null)
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{
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ret = "";
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}
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//System.err.println("\tret="+ret);
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return ret;
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}
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void set(QName name, Object value, int type)
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{
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switch (type)
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{
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case VARIABLE:
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Map<QName,Object> vctx = variables.getFirst();
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vctx.put(name, value);
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break;
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case PARAM:
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Map<QName,Object> pctx = parameters.getFirst();
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pctx.put(name, value);
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break;
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case WITH_PARAM:
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Map<QName,Object> wctx = withParameters.getFirst();
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wctx.put(name, value);
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break;
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}
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//System.err.println("Set "+name+"="+value);
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}
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public Object resolveVariable(QName qName)
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{
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return get(qName, null, 1, 1);
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}
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public String toString()
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{
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CPStringBuilder buf = new CPStringBuilder();
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boolean next = false;
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Collection<QName> seen = new HashSet<QName>();
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Map<QName,Object> wctx = withParameters.getFirst();
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buf.append('(');
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for (Map.Entry<QName,Object> entry : wctx.entrySet())
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{
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if (next)
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{
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buf.append(',');
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}
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else
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{
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next = true;
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}
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QName key = entry.getKey();
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if (!seen.contains(key))
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{
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buf.append(key);
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buf.append('=');
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buf.append(entry.getValue());
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seen.add(key);
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}
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}
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buf.append(')');
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next = false;
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seen.clear();
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buf.append('{');
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for (Map<QName,Object> ctx : variables)
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{
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for (Map.Entry<QName,Object> entry : ctx.entrySet())
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{
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if (next)
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{
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buf.append(',');
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}
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else
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{
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next = true;
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}
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QName key = entry.getKey();
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if (!seen.contains(key))
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{
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buf.append(key);
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buf.append('=');
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buf.append(entry.getValue());
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seen.add(key);
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}
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}
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}
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buf.append('}');
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next = false;
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seen.clear();
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buf.append('[');
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for (Map<QName,Object> ctx : parameters)
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{
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for (Map.Entry<QName,Object> entry : ctx.entrySet())
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{
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if (next)
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{
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buf.append(',');
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}
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else
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{
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next = true;
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}
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QName key = entry.getKey();
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if (!seen.contains(key))
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{
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buf.append(key);
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buf.append('=');
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buf.append(entry.getValue());
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seen.add(key);
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}
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}
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}
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buf.append(']');
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return buf.toString();
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}
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}
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