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/*******************************************************************************
* Copyright (c) 2007, 2015 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.help.internal;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.StringReader;
import java.net.URL;
import java.net.URLConnection;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
public class CachedEntityResolver implements EntityResolver {
@Override
public InputSource resolveEntity(String publicId, String systemId) {
int index = systemId.lastIndexOf("/"); //$NON-NLS-1$
File cachedCopy = null;
if (index != -1) {
cachedCopy = new File(HelpPlugin.getConfigurationDirectory(), "/DTDs"); //$NON-NLS-1$
cachedCopy.mkdirs();
cachedCopy = new File(cachedCopy, systemId.substring(index));
}
if (cachedCopy != null) {
if (!cachedCopy.exists()) {
try {
URL system = new URL(systemId);
URLConnection sc = system.openConnection();
BufferedReader in = new BufferedReader(
new InputStreamReader(
sc.getInputStream()));
String inputLine;
BufferedWriter out = new BufferedWriter(new FileWriter(cachedCopy));
while ((inputLine = in.readLine()) != null) {
out.write(inputLine);
out.newLine();
}
in.close();
out.flush();
out.close();
} catch (IOException e) {}
}
try {
InputSource is = new InputSource(new FileReader(cachedCopy));
is.setSystemId(systemId);
is.setPublicId(publicId);
return is;
} catch (FileNotFoundException e) {}
}
return new InputSource(new StringReader("")); //$NON-NLS-1$
}
}
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