svn-gvsig-desktop / trunk / build / distribution / IzPack / src / lib / net / n3 / nanoxml / XMLEntityResolver.java @ 21757
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/* XMLEntityResolver.java NanoXML/Java
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*
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* $Revision: 5819 $
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* $Date: 2006-06-14 09:29:09 +0200 $
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* $Name$
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*
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* This file is part of NanoXML 2 for Java.
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* Copyright (C) 2001 Marc De Scheemaecker, All Rights Reserved.
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*
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* This software is provided 'as-is', without any express or implied warranty.
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* In no event will the authors be held liable for any damages arising from the
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* use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software in
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* a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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*
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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*
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* 3. This notice may not be removed or altered from any source distribution.
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*/
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package net.n3.nanoxml; |
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import java.io.Reader; |
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import java.io.StringReader; |
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import java.util.Hashtable; |
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/**
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* An XMLEntityResolver resolves entities.
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*
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* @author Marc De Scheemaecker
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* @version $Name$, $Revision: 5819 $
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*/
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public class XMLEntityResolver |
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implements IXMLEntityResolver
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{ |
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/**
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* The entities.
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*/
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private Hashtable entities; |
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/**
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* Initializes the resolver.
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*/
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public XMLEntityResolver()
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{ |
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this.entities = new Hashtable(); |
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this.entities.put("amp", "&"); |
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this.entities.put("quot", """); |
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this.entities.put("apos", "'"); |
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this.entities.put("lt", "<"); |
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this.entities.put("gt", ">"); |
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} |
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/**
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* Cleans up the object when it's destroyed.
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*/
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protected void finalize() |
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throws Throwable |
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{ |
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this.entities.clear();
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this.entities = null; |
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super.finalize();
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} |
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/**
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* Adds an internal entity.
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*
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* @param name the name of the entity.
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* @param value the value of the entity.
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*/
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public void addInternalEntity(String name, |
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String value)
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{ |
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if (! this.entities.containsKey(name)) { |
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this.entities.put(name, value);
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} |
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} |
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/**
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* Adds an external entity.
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*
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* @param name the name of the entity.
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* @param publicID the public ID of the entity, which may be null.
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* @param systemID the system ID of the entity.
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*/
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public void addExternalEntity(String name, |
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String publicID,
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String systemID)
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{ |
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if (! this.entities.containsKey(name)) { |
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this.entities.put(name, new String[] { publicID, systemID } ); |
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} |
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} |
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/**
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* Returns a Java reader containing the value of an entity.
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*
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* @param xmlReader the current XML reader
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* @param name the name of the entity.
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*
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* @return the reader, or null if the entity could not be resolved.
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*/
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public Reader getEntity(IXMLReader xmlReader, |
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String name)
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throws XMLParseException |
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{ |
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Object obj = this.entities.get(name); |
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if (obj == null) { |
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return null; |
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} else if (obj instanceof java.lang.String) { |
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return new StringReader((String)obj); |
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} else {
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String[] id = (String[]) obj; |
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return this.openExternalEntity(xmlReader, id[0], id[1]); |
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} |
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} |
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/**
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* Opens an external entity.
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*
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* @param xmlReader the current XML reader
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* @param publicID the public ID, which may be null
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* @param systemID the system ID
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*
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* @return the reader, or null if the reader could not be created/opened
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*/
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protected Reader openExternalEntity(IXMLReader xmlReader, |
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String publicID,
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String systemID)
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throws XMLParseException |
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{ |
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try {
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return xmlReader.openStream(publicID, systemID);
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} catch (Exception e) { |
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throw new XMLParseException(xmlReader.getSystemID(), |
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xmlReader.getLineNr(), |
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"Could not open external entity "
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+ "at system ID: " + systemID);
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} |
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} |
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} |