org.mule.util.ChainedReader Maven / Gradle / Ivy
/*
* $Id: ChainedReader.java 19191 2010-08-25 21:05:23Z tcarlson $
* --------------------------------------------------------------------------------------
* Copyright (c) MuleSoft, Inc. All rights reserved. http://www.mulesoft.com
*
* The software in this package is published under the terms of the CPAL v1.0
* license, a copy of which has been included with this distribution in the
* LICENSE.txt file.
*/
package org.mule.util;
import java.io.IOException;
import java.io.Reader;
/**
* ChainedReader allows Reader objects to be chained together. Useful
* for concatenating data from multiple Reader objects.
*/
public class ChainedReader extends Reader
{
private final Reader first;
private final Reader second;
private boolean firstRead = false;
public ChainedReader(Reader first, Reader second)
{
this.first = first;
this.second = second;
}
public void close() throws IOException
{
first.close();
second.close();
}
public int read(char[] cbuf, int off, int len) throws IOException
{
if (!firstRead)
{
int i = first.read(cbuf, off, len);
if (i < len)
{
firstRead = true;
int x = second.read(cbuf, i, len - i);
return x + i;
}
else
{
return i;
}
}
else
{
return second.read(cbuf, off, len);
}
}
public int read() throws IOException
{
if (!firstRead)
{
int i = first.read();
if (i == -1)
{
firstRead = true;
return second.read();
}
else
{
return i;
}
}
else
{
return second.read();
}
}
public int read(char[] cbuf) throws IOException
{
if (!firstRead)
{
int i = first.read(cbuf);
if (i < cbuf.length)
{
firstRead = true;
int x = second.read(cbuf, i, cbuf.length - i);
return x + i;
}
else
{
return i;
}
}
else
{
return second.read(cbuf);
}
}
}