de.unkrig.commons.io.WyeReader Maven / Gradle / Ivy
/*
* de.unkrig.commons - A general-purpose Java class library
*
* Copyright (c) 2014, Arno Unkrig
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
* following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the
* following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
* following disclaimer in the documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package de.unkrig.commons.io;
import java.io.FilterReader;
import java.io.IOException;
import java.io.Reader;
import java.io.Writer;
import de.unkrig.commons.lang.AssertionUtil;
import de.unkrig.commons.nullanalysis.Nullable;
/**
* Duplicates all bytes that it reads to a {@link Writer}.
*
* The {@link Writer} is flushed on end-of-input.
*
* The {@link Writer} is not closed on {@link #close()}.
*/
public
class WyeReader extends FilterReader {
static { AssertionUtil.enableAssertionsForThisClass(); }
private final Writer out;
public
WyeReader(Reader in, Writer out) {
super(in);
this.out = out;
}
@Override public int
read() throws IOException {
int b = super.read();
if (b == -1) {
this.out.flush();
} else {
this.out.write(b);
}
return b;
}
@Override public int
read(@Nullable char[] cbuf, int off, int len) throws IOException {
assert cbuf != null;
int count = super.read(cbuf, off, len);
if (count > 0) this.out.write(cbuf, off, count);
if (count == 0) this.out.flush();
return count;
}
}