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/*
 * Copyright (c) 1997, 2021 Oracle and/or its affiliates. All rights reserved.
 * Copyright 1995-2005 The Apache Software Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.sun.xml.wss.impl.transform;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;



import org.w3c.dom.Attr;
import org.w3c.dom.Node;


/**
 * A stack based Symble Table.
 *
For speed reasons all the symbols are introduced in the same map, * and at the same time in a list so it can be removed when the frame is pop back. * @author Raul Benito **/ public class NameSpaceSymbTable { /**The map betwen prefix-> entry table. */ HashMap symb = new HashMap(); /**The level of nameSpaces (for Inclusive visibility).*/ int nameSpaces=0; /**The stacks for removing the definitions when doing pop.*/ List level = new ArrayList(); boolean cloned=true; static final String XMLNS="xmlns"; /** * Default constractor **/ public NameSpaceSymbTable() { //Insert the default binding for xmlns. NameSpaceSymbEntry ne=new NameSpaceSymbEntry("",null,true); ne.lastrendered=""; symb.put(XMLNS,ne); } /** * Get all the unrendered nodes in the name space. * For Inclusive rendering * @param result the list where to fill the unrendered xmlns definitions. **/ @SuppressWarnings("unchecked") public void getUnrenderedNodes(Collection result) { //List result=new ArrayList(); Iterator it=symb.entrySet().iterator(); while (it.hasNext()) { NameSpaceSymbEntry n=(NameSpaceSymbEntry)((Map.Entry)it.next()).getValue(); //put them rendered? if ((!n.rendered) && (n.n!=null)) { result.add(n.n); n.rendered=true; } } } /** * Push a frame for visible namespace. * For Inclusive rendering. **/ public void outputNodePush() { nameSpaces++; push(); } /** * Pop a frame for visible namespace. **/ public void outputNodePop() { nameSpaces--; pop(); } /** * Push a frame for a node. * Inclusive or Exclusive. **/ @SuppressWarnings("unchecked") public void push() { //Put the number of namespace definitions in the stack. /**if (cloned) { Object ob[]= {symb,cloned ? symb : null}; level.add(ob); } **/ level.add(null); cloned=false; } /** * Pop a frame. * Inclusive or Exclusive. **/ @SuppressWarnings("unchecked") public void pop() { int size=level.size()-1; Object ob= level.remove(size); if (ob!=null) { symb=(HashMap)ob; if (size==0) { cloned=false; } else cloned=(level.get(size-1)!=symb); } else { cloned=false; } } @SuppressWarnings("unchecked") final void needsClone() { if (!cloned) { level.remove(level.size()-1); level.add(symb); symb=(HashMap) symb.clone(); cloned=true; } } /** * Gets the attribute node that defines the binding for the prefix. * @param prefix the prefix to obtain the attribute. * @return null if there is no need to render the prefix. Otherwise the node of * definition. **/ public Attr getMapping(String prefix) { NameSpaceSymbEntry entry=(NameSpaceSymbEntry) symb.get(prefix); if (entry==null) { //There is no definition for the prefix(a bug?). return null; } if (entry.rendered) { //No need to render an entry already rendered. return null; } // Mark this entry as render. entry=(NameSpaceSymbEntry) entry.clone(); needsClone(); symb.put(prefix,entry); entry.rendered=true; entry.level=nameSpaces; entry.lastrendered=entry.uri; // Return the node for outputing. return entry.n; } /** * Gets a definition without mark it as render. * For render in exclusive c14n the namespaces in the include prefixes. * @param prefix The prefix whose definition is neaded. * @return the attr to render, null if there is no need to render **/ public Attr getMappingWithoutRendered(String prefix) { NameSpaceSymbEntry entry=(NameSpaceSymbEntry) symb.get(prefix); if (entry==null) { return null; } if (entry.rendered) { return null; } return entry.n; } /** * Adds the mapping for a prefix. * @param prefix the prefix of definition * @param uri the Uri of the definition * @param n the attribute that have the definition * @return true if there is already defined. **/ public boolean addMapping(String prefix, String uri,Attr n) { NameSpaceSymbEntry ob = (NameSpaceSymbEntry)symb.get(prefix); if ((ob!=null) && uri.equals(ob.uri)) { //If we have it previously defined. Don't keep working. return false; } //Creates and entry in the table for this new definition. NameSpaceSymbEntry ne=new NameSpaceSymbEntry(uri,n,false); needsClone(); symb.put(prefix, ne); if (ob != null) { //We have a previous definition store it for the pop. //Check if a previous definition(not the inmidiatly one) has been rendered. ne.lastrendered=ob.lastrendered; if ((ob.lastrendered!=null)&& (ob.lastrendered.equals(uri))) { //Yes it is. Mark as rendered. ne.rendered=true; } } return true; } /** * Adds a definition and mark it as render. * For inclusive c14n. * @param prefix the prefix of definition * @param uri the Uri of the definition * @param n the attribute that have the definition * @return the attr to render, null if there is no need to render **/ public Node addMappingAndRender(String prefix, String uri,Attr n) { NameSpaceSymbEntry ob = (NameSpaceSymbEntry)symb.get(prefix); if ((ob!=null) && uri.equals(ob.uri)) { if (!ob.rendered) { ob=(NameSpaceSymbEntry) ob.clone(); needsClone(); symb.put(prefix,ob); ob.lastrendered=uri; ob.rendered=true; return ob.n; } return null; } NameSpaceSymbEntry ne=new NameSpaceSymbEntry(uri,n,true); ne.lastrendered=uri; needsClone(); symb.put(prefix, ne); if (ob != null) { if ((ob.lastrendered!=null)&& (ob.lastrendered.equals(uri))) { ne.rendered=true; return null; } } return ne.n; } /** * Adds and gets(if needed) the attribute node that defines the binding for the prefix. * Take on account if the rules of rendering in the inclusive c14n. * For inclusive c14n. * @param prefix the prefix to obtain the attribute. * @param outputNode the container element is an output element. * @param uri the Uri of the definition * @param n the attribute that have the definition * @return null if there is no need to render the prefix. Otherwise the node of * definition. **/ public Node addMappingAndRenderXNodeSet(String prefix, String uri,Attr n,boolean outputNode) { NameSpaceSymbEntry ob = (NameSpaceSymbEntry)symb.get(prefix); int visibleNameSpaces=nameSpaces; if ((ob!=null) && uri.equals(ob.uri)) { if (!ob.rendered) { ob=(NameSpaceSymbEntry)ob.clone(); needsClone(); symb.put(prefix,ob); ob.rendered=true; ob.level=visibleNameSpaces; return ob.n; } ob=(NameSpaceSymbEntry)ob.clone(); needsClone(); symb.put(prefix,ob); if (outputNode && (((visibleNameSpaces-ob.level)<2) || XMLNS.equals(prefix)) ) { ob.level=visibleNameSpaces; return null; //Already rendered, just return nulll } ob.level=visibleNameSpaces; return ob.n; } NameSpaceSymbEntry ne=new NameSpaceSymbEntry(uri,n,true); ne.level=nameSpaces; ne.rendered=true; needsClone(); symb.put(prefix, ne); if (ob != null) { ne.lastrendered=ob.lastrendered; if ((ob.lastrendered!=null)&& (ob.lastrendered.equals(uri))) { ne.rendered=true; } } return ne.n; } } /** * The internal structure of NameSpaceSymbTable. **/ class NameSpaceSymbEntry implements Cloneable { NameSpaceSymbEntry(String name,Attr n,boolean rendered) { this.uri=name; this.rendered=rendered; this.n=n; } public Object clone() { try { return super.clone(); } catch (CloneNotSupportedException e) { return null; } } /** The level where the definition was rendered(Only for inclusive) */ int level=0; /**The URI that the prefix defines */ String uri; /**The last output in the URI for this prefix (This for speed reason).*/ String lastrendered=null; /**This prefix-URI has been already render or not.*/ boolean rendered=false; /**The attribute to include.*/ Attr n; };




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