/*******************************************************************************
 * Copyright (c) 2005, 2011 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.osgi.internal.baseadaptor;

import java.io.*;
import java.net.URL;
import java.net.URLConnection;
import java.util.Dictionary;
import org.eclipse.osgi.baseadaptor.BaseData;
import org.eclipse.osgi.baseadaptor.hooks.StorageHook;
import org.eclipse.osgi.framework.adaptor.BundleData;
import org.eclipse.osgi.framework.adaptor.BundleOperation;
import org.eclipse.osgi.framework.debug.Debug;
import org.eclipse.osgi.framework.internal.core.ReferenceInputStream;
import org.eclipse.osgi.util.NLS;
import org.osgi.framework.*;

public class BundleInstall implements BundleOperation {
	private BaseData data;
	private URLConnection source;
	private BaseStorage storage;

	public BundleInstall(BaseData data, URLConnection source, BaseStorage storage) {
		this.data = data;
		this.source = source;
		this.storage = storage;
	}

	/**
	 * Begin the operation on the bundle (install, update, uninstall).
	 *
	 * @return BundleData object for the target bundle.
	 * @throws BundleException If a failure occured modifiying peristent storage.
	 */
	public BundleData begin() throws BundleException {
		try {
			InputStream in = null;
			try {
				data.setLastModified(System.currentTimeMillis());
				data.setStartLevel(storage.getInitialBundleStartLevel());
				StorageHook[] storageHooks = data.getAdaptor().getHookRegistry().getStorageHooks();
				StorageHook[] instanceHooks = new StorageHook[storageHooks.length];
				for (int i = 0; i < storageHooks.length; i++)
					instanceHooks[i] = storageHooks[i].create(data);
				data.setStorageHooks(instanceHooks);
				BaseStorageHook storageHook = (BaseStorageHook) data.getStorageHook(BaseStorageHook.KEY);
				in = source.getInputStream();
				URL sourceURL = source.getURL();
				String protocol = sourceURL == null ? null : sourceURL.getProtocol();
				if (in instanceof ReferenceInputStream) {
					URL reference = ((ReferenceInputStream) in).getReference();
					if (!"file".equals(reference.getProtocol())) //$NON-NLS-1$
						throw new BundleException(NLS.bind(AdaptorMsg.ADAPTOR_URL_CREATE_EXCEPTION, reference));
					storageHook.setReference(true);
					storageHook.setFileName(reference.getPath());
				} else {
					File genDir = storageHook.createGenerationDir();
					if (!genDir.exists())
						throw new IOException(NLS.bind(AdaptorMsg.ADAPTOR_DIRECTORY_CREATE_EXCEPTION, genDir.getPath()));
					storageHook.setReference(false);
					storageHook.setFileName(BaseStorage.BUNDLEFILE_NAME);
					File outFile = new File(genDir, storageHook.getFileName());
					if ("file".equals(protocol)) { //$NON-NLS-1$
						File inFile = new File(source.getURL().getPath());
						if (inFile.isDirectory())
							AdaptorUtil.copyDir(inFile, outFile);
						else
							AdaptorUtil.readFile(in, outFile);
					} else {
						AdaptorUtil.readFile(in, outFile);
					}
				}
				Dictionary<String, String> manifest = storage.loadManifest(data, true);
				for (int i = 0; i < instanceHooks.length; i++)
					instanceHooks[i].initialize(manifest);
			} finally {
				try {
					if (in != null)
						in.close();
				} catch (IOException e) {
					// do nothing
				}
			}
		} catch (IOException ioe) {
			throw new BundleException(AdaptorMsg.BUNDLE_READ_EXCEPTION, BundleException.READ_ERROR, ioe);
		}

		return (data);
	}

	public void undo() {
		if (data != null) {
			try {
				data.close();
			} catch (IOException e) {
				if (Debug.DEBUG_GENERAL)
					Debug.println("Unable to close " + data + ": " + e.getMessage()); //$NON-NLS-1$ //$NON-NLS-2$
			}
		}

		if (data != null) {
			BaseStorageHook storageHook = (BaseStorageHook) data.getStorageHook(BaseStorageHook.KEY);
			try {
				if (storageHook != null)
					storageHook.delete(false, BaseStorageHook.DEL_BUNDLE_STORE);
			} catch (IOException e) {
				data.getAdaptor().getEventPublisher().publishFrameworkEvent(FrameworkEvent.ERROR, data.getBundle(), e);
			}
		}
	}

	public void commit(boolean postpone) throws BundleException {
		storage.processExtension(data, BaseStorage.EXTENSION_INSTALLED);
		storage.updateState(data, BundleEvent.INSTALLED);
		try {
			data.save();
		} catch (IOException e) {
			throw new BundleException(AdaptorMsg.ADAPTOR_STORAGE_EXCEPTION, e);
		}

	}

}