com.sun.jersey.api.client.CommittingOutputStream Maven / Gradle / Ivy
/*
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 1997-2007 Sun Microsystems, Inc. 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://jersey.dev.java.net/CDDL+GPL.html
* or jersey/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 jersey/legal/LICENSE.txt.
* Sun designates this particular file as subject to the "Classpath" exception
* as provided by Sun in the GPL Version 2 section of the License file that
* accompanied this code. If applicable, add the following below the License
* Header, with the fields enclosed by brackets [] replaced by your own
* identifying information: "Portions Copyrighted [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 com.sun.jersey.api.client;
import java.io.IOException;
import java.io.OutputStream;
/**
* A commiting output stream that commits before
* the first byte is written to the adapted {@link OutputStream}.
*
* This class may be overridden to provide the commit functionality.
*
* @author [email protected]
*/
public abstract class CommittingOutputStream extends OutputStream {
private OutputStream o;
private boolean isCommitted;
/**
* Construct a new instance.
*
* The method {@link #getOutputStream() } MUST be overridden
* to return an output stream.
*/
public CommittingOutputStream() {
}
/**
* Construct a new instance with an output stream to adapt.
*
* @param o the adapted output stream.
* @throws IllegalArgumentException if o is null.
*/
public CommittingOutputStream(OutputStream o) {
if (o == null)
throw new IllegalArgumentException();
this.o = o;
}
@Override
public void write(byte b[]) throws IOException {
commitWrite();
o.write(b);
}
@Override
public void write(byte b[], int off, int len) throws IOException {
commitWrite();
o.write(b, off, len);
}
public void write(int b) throws IOException {
commitWrite();
o.write(b);
}
@Override
public void flush() throws IOException {
commitWrite();
o.flush();
}
@Override
public void close() throws IOException {
commitWrite();
o.close();
}
private void commitWrite() throws IOException {
if (!isCommitted) {
isCommitted = true;
commit();
if (o == null)
o = getOutputStream();
}
}
/**
* Get the adapted output stream.
*
* This method MUST be overriden if the empty constructor is
* utilized to construct an instance of this class.
*
* @return the adapted output stream.
* @throws java.io.IOException
*/
protected OutputStream getOutputStream() throws IOException {
throw new IllegalStateException();
}
/**
* Perform the commit functionality.
*
* @throws java.io.IOException
*/
protected abstract void commit() throws IOException;
};