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Ant example source code file (P4HandlerAdapter.java)

This example Ant source code file (P4HandlerAdapter.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Ant tags/keywords

buildexception, error, input, inputstream, inputstream, io, ioexception, ioexception, p4handler, p4handleradapter, p4outputstream, p4outputstream, pumpstreamhandler, pumpstreamhandler, string

The P4HandlerAdapter.java source code

/*
 *  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.taskdefs.optional.perforce;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.taskdefs.PumpStreamHandler;
/**
 * base class to manage streams around the execution of the Perforce
 * command line client
 */
public abstract class P4HandlerAdapter  implements P4Handler {
    // CheckStyle:VisibilityModifier OFF - bc
    String p4input = "";
    private PumpStreamHandler myHandler = null;
    // CheckStyle:VisibilityModifier ON
    /**
     *  set any data to be written to P4's stdin
     *  @param p4Input the text to write to P4's stdin
     */
    public void setOutput(String p4Input) {
        this.p4input = p4Input;
    }
    /**
     * subclasses of P4HandlerAdapter must implement this routine
     * processing of one line of stdout or of stderr
     * @param line line of stdout or stderr to process
     */
    public abstract void process(String line);

    /**
     * this routine gets called by the execute routine of the Execute class
     * it connects the PumpStreamHandler to the input/output/error streams of the process.
     * @throws BuildException if there is a error.
     * @see org.apache.tools.ant.taskdefs.Execute#execute
     */
    public void start() throws BuildException {
        if (p4input != null && p4input.length() > 0) {
            myHandler = new PumpStreamHandler(new P4OutputStream(this), new P4OutputStream(this),
                new ByteArrayInputStream(p4input.getBytes()));
        } else {
            myHandler = new PumpStreamHandler(new P4OutputStream(this), new P4OutputStream(this));
        }
        myHandler.setProcessInputStream(os);
        myHandler.setProcessErrorStream(es);
        myHandler.setProcessOutputStream(is);
        myHandler.start();
    }

    /**
     * stops the processing of streams
     * called from P4Base#execP4Command(String command, P4Handler handler)
     * @see P4Base#execP4Command(String, P4Handler)
     */
    public void stop() {
        myHandler.stop();
    }

    // CheckStyle:VisibilityModifier OFF - bc
    OutputStream os;    //Input
    InputStream is;     //Output
    InputStream es;     //Error
    // CheckStyle:VisibilityModifier ON

    /**
     * connects the handler to the input stream into Perforce
     * used indirectly by tasks requiring to send specific standard input
     * such as p4label, p4change
     * @param os the stream bringing input to the p4 executable
     * @throws IOException under unknown circumstances
     */
    public void setProcessInputStream(OutputStream os) throws IOException {
        this.os = os;
    }

    /**
     * connects the handler to the stderr of the Perforce process
     * @param is stderr coming from Perforce
     * @throws IOException under unknown circumstances
     */
    public void setProcessErrorStream(InputStream is) throws IOException {
        this.es = is;
    }

    /**
     * connects the handler to the stdout of the Perforce process
     * @param is stdout coming from Perforce
     * @throws IOException under unknown circumstances
     */
    public void setProcessOutputStream(InputStream is) throws IOException {
        this.is = is;
    }
}

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