/*******************************************************************************
* Copyright (c) 2006, 2008 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.base.remote;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.core.runtime.preferences.IEclipsePreferences.IPreferenceChangeListener;
import org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent;
import org.eclipse.help.AbstractContentExtensionProvider;
import org.eclipse.help.IContentExtension;
import org.eclipse.help.internal.UAElement;
import org.eclipse.help.internal.base.HelpBasePlugin;
import org.eclipse.help.internal.dynamic.DocumentReader;
public class RemoteExtensionProvider extends AbstractContentExtensionProvider {
private static final String PATH_EXTENSIONS = "/extension"; //$NON-NLS-1$
private DocumentReader reader;
public RemoteExtensionProvider() {
RemoteHelp.addPreferenceChangeListener(new IPreferenceChangeListener() {
public void preferenceChange(PreferenceChangeEvent event) {
contentChanged();
}
});
}
public IContentExtension[] getContentExtensions(String locale) {
if (RemoteHelp.isEnabled()) {
List contributions = new ArrayList();
PreferenceFileHandler handler = new PreferenceFileHandler();
String isEnabled[] = handler.isEnabled();
for (int ic = 0; ic < handler.getTotalRemoteInfocenters(); ic++) {
if (isEnabled[ic].equalsIgnoreCase("true")) { //$NON-NLS-1$
InputStream in = null;
try {
URL url = RemoteHelp.getURL(ic, PATH_EXTENSIONS);
in = url.openStream();
if (reader == null) {
reader = new DocumentReader();
}
UAElement element = reader.read(in);
IContentExtension[] children = (IContentExtension[]) element
.getChildren(IContentExtension.class);
for (int contrib = 0; contrib < children.length; contrib++) {
contributions.add(children[contrib]);
}
} catch (IOException e) {
String msg = "I/O error while trying to contact the remote help server"; //$NON-NLS-1$
HelpBasePlugin.logError(msg, e);
} catch (Throwable t) {
String msg = "Internal error while reading topic extensions from remote server"; //$NON-NLS-1$
HelpBasePlugin.logError(msg, t);
} finally {
if (in != null) {
try {
in.close();
} catch (IOException e) {
// nothing more we can do
}
}
}
}
}
return (IContentExtension[]) contributions.toArray(new IContentExtension[contributions.size()]);
}
return new IContentExtension[0];
}
}
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