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The library for reading and writing Debian Packages.
/*
* dpkg - Debian Package library and the Debian Package Maven plugin
* (c) Copyright 2015 Gerrit Hohl
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package net.sourceforge.javadpkg.io.impl;
import java.io.IOException;
import java.io.InputStream;
import net.sourceforge.javadpkg.io.DataSource;
/**
*
* A {@link DataSource} implementation based on a stream.
*
*
* @author Gerrit Hohl ([email protected])
* @version 1.0, 31.12.2015 by Gerrit Hohl
*/
public class DataStreamSource implements DataSource {
/** The stream. */
private InputStream in;
/**
*
* The public stream which is returned by the {@link #getInputStream()}
* method.
*
*/
private UncloseableInputStream publicIn;
/** The name of the source. */
private String name;
/** The flag if the {@link #close()} method will close the stream. */
private boolean closeable;
/**
*
* Creates a source.
*
*
* @param in
* The stream.
* @param name
* The name of the source.
* @param closeable
* The flag if the {@link #close()} method will close the stream.
* @throws IllegalArgumentException
* If any of the parameters are null
.
*/
public DataStreamSource(InputStream in, String name, boolean closeable) {
super();
if (in == null)
throw new IllegalArgumentException("Argument in is null.");
if (name == null)
throw new IllegalArgumentException("Argument name is null.");
this.in = in;
this.name = name;
this.closeable = closeable;
this.createPublicInputStream();
}
@Override
public String getName() {
return this.name;
}
@Override
public long getLength() {
return -1;
}
@Override
public boolean isResettable() {
return false;
}
@Override
public void reset() throws IOException {
throw new IOException("Source |" + this.name + "| doesn't support a reset.");
}
/**
*
* Creates the {@link InputStream} which is returned by the
* {@link #getInputStream()} method.
*
*/
private void createPublicInputStream() {
this.publicIn = new UncloseableInputStream(this.in, new DelegateCloseHandler(this));
}
@Override
public InputStream getInputStream() throws IOException {
return this.publicIn;
}
@Override
public void close() throws IOException {
try {
if ((this.in != null) && this.closeable) {
this.in.close();
}
} finally {
this.publicIn = null;
this.in = null;
}
}
}