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/*
* File: NullReader.java
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* The contents of this file are subject to the terms and conditions of
* the Common Development and Distribution License 1.0 (the "License").
*
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the License by consulting the LICENSE.txt file
* distributed with this file, or by consulting https://oss.oracle.com/licenses/CDDL
*
* 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 LICENSE.txt.
*
* 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]"
*/
package com.oracle.bedrock.runtime.java.io;
import java.io.IOException;
import java.io.Reader;
import java.util.concurrent.atomic.AtomicBoolean;
/**
* A {@link Reader} that produces nothing (is always at the end of the stream).
*
* Copyright (c) 2013. All Rights Reserved. Oracle Corporation.
* Oracle is a registered trademark of Oracle Corporation and/or its affiliates.
*
* @author Brian Oliver
*/
public class NullReader extends Reader
{
/**
* Has the Reader been closed?
*/
private AtomicBoolean m_isClosed;
/**
* Constructs a {@link NullReader}.
*/
public NullReader()
{
super();
m_isClosed = new AtomicBoolean(false);
}
@Override
public void close() throws IOException
{
m_isClosed.set(true);
}
@Override
public boolean ready() throws IOException
{
return false;
}
@Override
public int read(char[] chars,
int offset,
int length) throws IOException
{
if (m_isClosed.get())
{
throw new IOException("NullReader is closed");
}
return -1; // we're at the end of the stream
}
}