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/*
* JBoss, Home of Professional Open Source
* Copyright 2005, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.ws.core.utils;
import java.util.HashMap;
/**
* Utility class for resolving predefined XML entity and character references.
*
* @author <a href="mailto:jason.greene@jboss.com">Jason T. Greene</a>
* @version $Revision: 1757 $
*/
public class XMLPredefinedEntityReferenceResolver
{
private static HashMap<String, Character> entities = new HashMap<String, Character>();
static
{
entities.put("quot", '"');
entities.put("amp", '&');
entities.put("lt", '<');
entities.put("gt", '>');
entities.put("apos", '\'');
}
private static int resolveCharRef(String source, int pos, StringBuilder builder)
{
int radix = 10;
if (source.charAt(pos += 2) == 'x')
{
pos++;
radix = 16;
}
int end = source.indexOf(';', pos);
if (end == -1)
throw new IllegalArgumentException("Invalid character reference");
int c = Integer.parseInt(source.substring(pos, end), radix);
builder.append((char) c);
return end + 1;
}
private static int resolveEntityRef(String source, int pos, StringBuilder builder)
{
int end = source.indexOf(';', ++pos);
if (end == -1)
throw new IllegalArgumentException("Invalid entity reference");
String entity = source.substring(pos, end);
Character c = entities.get(entity);
if (c == null)
throw new IllegalArgumentException("Invalid entity: " + entity);
builder.append(c.charValue());
return end + 1;
}
/**
* Transforms an XML normalized string by resolving all predefined character and entity references
*
* @param normalized an XML normalized string
* @return a standard java string that is no longer XML normalized
*/
public static String resolve(String normalized)
{
StringBuilder builder = new StringBuilder();
int end = normalized.length();
int pos = normalized.indexOf('&');
int last = 0;
// No references
if (pos == -1)
return normalized;
while (pos != -1)
{
String sub = normalized.subSequence(last, pos).toString();
builder.append(sub);
int peek = pos + 1;
if (peek == end)
throw new IllegalArgumentException("Invalid entity reference");
if (normalized.charAt(peek) == '#')
pos = resolveCharRef(normalized, pos, builder);
else
pos = resolveEntityRef(normalized, pos, builder);
last = pos;
pos = normalized.indexOf('&', pos);
}
if (last < end)
{
String sub = normalized.subSequence(last, end).toString();
builder.append(sub);
}
return builder.toString();
}
}
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