javax.mail.util.SharedByteArrayInputStream.debug Maven / Gradle / Ivy
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package javax.mail.util;
import java.io.*;
import javax.mail.internet.SharedInputStream;
/**
* A ByteArrayInputStream that implements the SharedInputStream interface,
* allowing the underlying byte array to be shared between multiple readers.
*
* @author Bill Shannon
* @since JavaMail 1.4
*/
public class SharedByteArrayInputStream extends ByteArrayInputStream
implements SharedInputStream {
private static final boolean debug = Boolean.getBoolean("mail.debug.shared");
/**
* Position within shared buffer that this stream starts at.
*/
protected int start = 0;
/**
* Create a SharedByteArrayInputStream representing the entire
* byte array.
*
* @param buf the byte array
*/
public SharedByteArrayInputStream(byte[] buf) {
super(buf);
if (debug)
System.out.println("SBAIS: " + this + " CREATED");
}
/**
* Create a SharedByteArrayInputStream representing the part
* of the byte array from offset for length
* bytes.
*
* @param buf the byte array
* @param offset offset in byte array to first byte to include
* @param length number of bytes to include
*/
public SharedByteArrayInputStream(byte[] buf, int offset, int length) {
super(buf, offset, length);
start = offset;
if (debug)
System.out.println("SBAIS: " + this + " CREATED");
}
/**
* Return the current position in the InputStream, as an
* offset from the beginning of the InputStream.
*
* @return the current position
*/
public long getPosition() {
return pos - start;
}
/**
* Return a new InputStream representing a subset of the data
* from this InputStream, starting at start (inclusive)
* up to end (exclusive). start must be
* non-negative. If end is -1, the new stream ends
* at the same place as this stream. The returned InputStream
* will also implement the SharedInputStream interface.
*
* @param start the starting position
* @param end the ending position + 1
* @return the new stream
*/
public InputStream newStream(long start, long end) {
if (start < 0)
throw new IllegalArgumentException("start < 0");
if (end == -1)
end = count - this.start;
return new SharedByteArrayInputStream(buf,
this.start + (int)start, (int)(end - start));
}
public void close() {
if (debug)
System.out.println("SBAIS: " + this + " CLOSED");
}
}