com.mchange.v1.xml.ResourceEntityResolver Maven / Gradle / Ivy
/*
* Distributed as part of mchange-commons-java 0.2.9
*
* Copyright (C) 2015 Machinery For Change, Inc.
*
* Author: Steve Waldman
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of EITHER:
*
* 1) The GNU Lesser General Public License (LGPL), version 2.1, as
* published by the Free Software Foundation
*
* OR
*
* 2) The Eclipse Public License (EPL), version 1.0
*
* You may choose which license to accept if you wish to redistribute
* or modify this work. You may offer derivatives of this work
* under the license you have chosen, or you may provide the same
* choice of license which you have been offered here.
*
* 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.
*
* You should have received copies of both LGPL v2.1 and EPL v1.0
* along with this software; see the files LICENSE-EPL and LICENSE-LGPL.
* If not, the text of these licenses are currently available at
*
* LGPL v2.1: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* EPL v1.0: http://www.eclipse.org/org/documents/epl-v10.php
*
*/
package com.mchange.v1.xml;
import java.io.InputStream;
import java.io.IOException;
import org.xml.sax.InputSource;
import org.xml.sax.EntityResolver;
import org.xml.sax.SAXException;
public class ResourceEntityResolver implements EntityResolver
{
ClassLoader cl;
String prefix;
public ResourceEntityResolver(ClassLoader cl, String rsrcPrefix)
{
///System.err.println("rsrcPrefix: " + rsrcPrefix);
this.cl = cl;
this.prefix = rsrcPrefix;
}
public ResourceEntityResolver(Class loadSibling)
{ this(loadSibling.getClassLoader(), classToPrefix(loadSibling)); }
public InputSource resolveEntity(String publicId, String systemId)
throws SAXException, IOException
{
// System.err.println("publicId: " + publicId);
// System.err.println("systemId: " + systemId);
if (systemId == null)
return null;
int last_slash = systemId.lastIndexOf('/');
String systemIdFilePart = (last_slash >= 0 ? systemId.substring(last_slash + 1) : systemId);
InputStream is = cl.getResourceAsStream(prefix + systemIdFilePart);
return (is == null ? null : new InputSource(is));
}
private static String classToPrefix(Class c)
{
String className = c.getName();
int last_dot = className.lastIndexOf('.');
String pkgName = (last_dot > 0 ? className.substring(0, last_dot) : null);
StringBuffer sb = new StringBuffer(256);
/* ClassLoader.getResourceAsStream() takes an arg always relative to classloader root. */
//sb.append('/');
if (pkgName != null)
{
sb.append(pkgName);
for (int i = 0, len = sb.length(); i < len; ++i)
if (sb.charAt(i) == '.') sb.setCharAt(i, '/');
sb.append('/');
}
return sb.toString();
}
}
// /* DEBUG CRAP */
// System.err.println();
// System.err.println();
// System.err.println();
// System.err.println("RESOLVING ENTITY");
// System.err.println();
// System.err.println();
// System.err.println(cl);
// InputStream test = cl.getResourceAsStream(prefix + systemIdFilePart);
// System.err.println("test: " + test);
// if (test == null)
// System.err.println("NULL DTD!!! (" + prefix + systemIdFilePart + ')');
// else
// {
// for (int b = test.read(); b >= 0; b = test.read()) System.err.write(b);
// System.err.flush();
// }
// /* END DEBUG CRAP */