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/*******************************************************************************
* Copyright (c) 2004, 2006 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;
}
}
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