| /******************************************************************************* |
| * Copyright (c) 2004, 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.osgi.baseadaptor.bundlefile; |
| |
| import java.io.*; |
| import java.net.URL; |
| import org.eclipse.osgi.framework.debug.Debug; |
| |
| /** |
| * A BundleEntry represents one entry of a BundleFile. |
| * <p> |
| * Clients may extend this class. |
| * </p> |
| * @since 3.2 |
| */ |
| public abstract class BundleEntry { |
| protected static final int BUF_SIZE = 8 * 1024; |
| |
| /** |
| * Return an InputStream for the entry. |
| * |
| * @return InputStream for the entry. |
| * @throws java.io.IOException If an error occurs reading the bundle. |
| */ |
| public abstract InputStream getInputStream() throws IOException; |
| |
| /** |
| * Return the size of the entry (uncompressed). |
| * |
| * @return size of entry. |
| */ |
| public abstract long getSize(); |
| |
| /** |
| * Return the name of the entry. |
| * |
| * @return name of entry. |
| */ |
| public abstract String getName(); |
| |
| /** |
| * Get the modification time for this BundleEntry. |
| * <p>If the modification time has not been set, |
| * this method will return <tt>-1</tt>. |
| * |
| * @return last modification time. |
| */ |
| public abstract long getTime(); |
| |
| /** |
| * Get a URL to the bundle entry that uses a common protocol (i.e. file: |
| * jar: or http: etc.). |
| * @return a URL to the bundle entry that uses a common protocol |
| */ |
| public abstract URL getLocalURL(); |
| |
| /** |
| * Get a URL to the content of the bundle entry that uses the file: protocol. |
| * The content of the bundle entry may be downloaded or extracted to the local |
| * file system in order to create a file: URL. |
| * @return a URL to the content of the bundle entry that uses the file: protocol |
| */ |
| public abstract URL getFileURL(); |
| |
| /** |
| * Return the name of this BundleEntry by calling getName(). |
| * |
| * @return String representation of this BundleEntry. |
| */ |
| public String toString() { |
| return (getName()); |
| } |
| |
| /** |
| * Used for class loading. This default implementation gets the input stream from this entry |
| * and copies the content into a byte array. |
| * @return a byte array containing the content of this entry |
| * @throws IOException |
| */ |
| public byte[] getBytes() throws IOException { |
| InputStream in = getInputStream(); |
| int length = (int) getSize(); |
| byte[] classbytes; |
| int bytesread = 0; |
| int readcount; |
| if (Debug.DEBUG && Debug.DEBUG_LOADER) |
| Debug.println(" about to read " + length + " bytes from " + getName()); //$NON-NLS-1$ //$NON-NLS-2$ |
| |
| try { |
| if (length > 0) { |
| classbytes = new byte[length]; |
| for (; bytesread < length; bytesread += readcount) { |
| readcount = in.read(classbytes, bytesread, length - bytesread); |
| if (readcount <= 0) /* if we didn't read anything */ |
| break; /* leave the loop */ |
| } |
| } else /* BundleEntry does not know its own length! */{ |
| length = BUF_SIZE; |
| classbytes = new byte[length]; |
| readloop: while (true) { |
| for (; bytesread < length; bytesread += readcount) { |
| readcount = in.read(classbytes, bytesread, length - bytesread); |
| if (readcount <= 0) /* if we didn't read anything */ |
| break readloop; /* leave the loop */ |
| } |
| byte[] oldbytes = classbytes; |
| length += BUF_SIZE; |
| classbytes = new byte[length]; |
| System.arraycopy(oldbytes, 0, classbytes, 0, bytesread); |
| } |
| } |
| if (classbytes.length > bytesread) { |
| byte[] oldbytes = classbytes; |
| classbytes = new byte[bytesread]; |
| System.arraycopy(oldbytes, 0, classbytes, 0, bytesread); |
| } |
| } finally { |
| try { |
| in.close(); |
| } catch (IOException ee) { |
| // nothing to do here |
| } |
| } |
| return classbytes; |
| } |
| } |