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/*******************************************************************************
* Copyright (c) 2003 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.osgi.framework.adaptor.core;
import java.io.IOException;
import java.net.URL;
import java.util.Dictionary;
import org.eclipse.osgi.framework.adaptor.BundleData;
import org.eclipse.osgi.framework.internal.core.Constants;
import org.eclipse.osgi.framework.internal.core.Msg;
import org.eclipse.osgi.framework.util.Headers;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleException;
/**
* An abstract BundleData class that has default implementations that most
* BundleData implementations can use.
*/
public abstract class AbstractBundleData implements BundleData {
/**
* The BundleManfifest for this BundleData.
*/
protected Dictionary manifest = null;
/**
* The Bundle object for this BundleData.
*/
protected Bundle bundle;
/**
* Return the BundleManifest for the BundleData. If the manifest
* field is null this method will parse the bundle manifest file and
* construct a BundleManifest file to return. If the manifest field is
* not null then the manifest object is returned.
* @return BundleManifest for the BundleData.
* @throws BundleException if an error occurred while reading the
* bundle manifest data.
*/
public Dictionary getManifest() throws BundleException {
if (manifest == null) {
synchronized (this) {
// make sure the manifest is still null after we have aquired the lock.
if (manifest == null) {
URL url = getEntry(Constants.OSGI_BUNDLE_MANIFEST);
if (url == null){
throw new BundleException(Msg.formatter.getString("MANIFEST_NOT_FOUND_EXCEPTION",Constants.OSGI_BUNDLE_MANIFEST,getLocation()));
}
try {
manifest = Headers.parseManifest(url.openStream());
} catch (IOException e) {
throw new BundleException(Msg.formatter.getString("MANIFEST_NOT_FOUND_EXCEPTION",Constants.OSGI_BUNDLE_MANIFEST,getLocation()), e);
}
}
}
}
return manifest;
}
/**
* Returns a Dictionary of all manifest headers. Returns the
* BundleManifest object of this BundleData. Note that the core
* implementation of BundleManifest extends the Dictionary class.
* @return A Dictionary of all manifest headers.
*/
public Dictionary getHeaders(){
try {
return getManifest();
} catch (BundleException e) {
return null;
}
}
/**
* Sets the Bundle object for this BundleData.
* @param bundle The Bundle Object for this BundleData.
*/
public void setBundle(Bundle bundle){
this.bundle = bundle;
}
}
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