org.apache.tools.ant.DemuxInputStream Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package org.apache.tools.ant;
import java.io.IOException;
import java.io.InputStream;
/**
*
* Passes input requests to the project object for demuxing into
* individual tasks and threads.
*
* @since Ant 1.6
*/
public class DemuxInputStream extends InputStream {
private static final int MASK_8BIT = 0xFF;
/**
* The project to from which to get input.
*/
private Project project;
/**
* Create a DemuxInputStream for the given project
*
* @param project the project instance
*/
public DemuxInputStream(Project project) {
this.project = project;
}
/**
* Read a byte from the project's demuxed input.
* @return the next byte
* @throws IOException on error
*/
public int read() throws IOException {
byte[] buffer = new byte[1];
if (project.demuxInput(buffer, 0, 1) == -1) {
return -1;
}
return buffer[0] & MASK_8BIT;
}
/**
* Read bytes from the project's demuxed input.
* @param buffer an array of bytes to read into
* @param offset the offset in the array of bytes
* @param length the number of bytes in the array
* @return the number of bytes read
* @throws IOException on error
*/
public int read(byte[] buffer, int offset, int length) throws IOException {
return project.demuxInput(buffer, offset, length);
}
}