Ant example source code file (JJDoc.java)

This example Ant source code file (JJDoc.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, buildexception, commandlinejava, default_suffix_html, default_suffix_text, file, file, hashtable, io, jjdoc, jjdoc, one_table, output_file, string, string, util

The JJDoc.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.javacc;

import java.io.File;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Hashtable;

import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.taskdefs.Execute;
import org.apache.tools.ant.taskdefs.LogStreamHandler;
import org.apache.tools.ant.types.Commandline;
import org.apache.tools.ant.types.CommandlineJava;
import org.apache.tools.ant.types.Path;
import org.apache.tools.ant.util.JavaEnvUtils;

/**
 * Runs the JJDoc compiler compiler.
 *
 */
public class JJDoc extends Task {

    // keys to optional attributes
    private static final String OUTPUT_FILE       = "OUTPUT_FILE";
    private static final String TEXT              = "TEXT";
    private static final String ONE_TABLE         = "ONE_TABLE";

    private final Hashtable optionalAttrs = new Hashtable();

    private String outputFile = null;
    private boolean plainText = false;

    private static final String DEFAULT_SUFFIX_HTML = ".html";
    private static final String DEFAULT_SUFFIX_TEXT = ".txt";

    // required attributes
    private File targetFile      = null;
    private File javaccHome      = null;

    private CommandlineJava cmdl = new CommandlineJava();


    /**
     * Sets the TEXT BNF documentation option.
     * @param plainText a <code>boolean value.
     */
    public void setText(boolean plainText) {
        optionalAttrs.put(TEXT, plainText ? Boolean.TRUE : Boolean.FALSE);
        this.plainText = plainText;
    }

    /**
     * Sets the ONE_TABLE documentation option.
     * @param oneTable a <code>boolean value.
     */
    public void setOnetable(boolean oneTable) {
        optionalAttrs.put(ONE_TABLE, oneTable ? Boolean.TRUE : Boolean.FALSE);
    }

    /**
     * The outputfile to write the generated BNF documentation file to.
     * If not set, the file is written with the same name as
     * the JavaCC grammar file with a suffix .html or .txt.
     * @param outputFile the name of the output file.
     */
    public void setOutputfile(String outputFile) {
        this.outputFile = outputFile;
    }

    /**
     * The javacc grammar file to process.
     * @param target the grammar file.
     */
    public void setTarget(File target) {
        this.targetFile = target;
    }

    /**
     * The directory containing the JavaCC distribution.
     * @param javaccHome the home directory.
     */
    public void setJavacchome(File javaccHome) {
        this.javaccHome = javaccHome;
    }

    /**
     * Constructor
     */
    public JJDoc() {
        cmdl.setVm(JavaEnvUtils.getJreExecutable("java"));
    }

    /**
     * Do the task.
     * @throws BuildException if there is an error.
     */
    public void execute() throws BuildException {

        // load command line with optional attributes
        Enumeration iter = optionalAttrs.keys();
        while (iter.hasMoreElements()) {
            String name  = (String) iter.nextElement();
            Object value = optionalAttrs.get(name);
            cmdl.createArgument()
                .setValue("-" + name + ":" + value.toString());
        }

        if (targetFile == null || !targetFile.isFile()) {
            throw new BuildException("Invalid target: " + targetFile);
        }

        if (outputFile != null) {
            cmdl.createArgument() .setValue("-" + OUTPUT_FILE + ":"
                                            + outputFile.replace('\\', '/'));
        }

        // use the directory containing the target as the output directory
        File javaFile = new File(createOutputFileName(targetFile, outputFile,
                                                      plainText));

        if (javaFile.exists()
             && targetFile.lastModified() < javaFile.lastModified()) {
            log("Target is already built - skipping (" + targetFile + ")",
                Project.MSG_VERBOSE);
            return;
        }

        cmdl.createArgument().setValue(targetFile.getAbsolutePath());

        final Path classpath = cmdl.createClasspath(getProject());
        final File javaccJar = JavaCC.getArchiveFile(javaccHome);
        classpath.createPathElement().setPath(javaccJar.getAbsolutePath());
        classpath.addJavaRuntime();

        cmdl.setClassname(JavaCC.getMainClass(classpath,
                                              JavaCC.TASKDEF_TYPE_JJDOC));

        final Commandline.Argument arg = cmdl.createVmArgument();
        arg.setValue("-mx140M");
        arg.setValue("-Dinstall.root=" + javaccHome.getAbsolutePath());

        final Execute process =
            new Execute(new LogStreamHandler(this,
                                             Project.MSG_INFO,
                                             Project.MSG_INFO),
                        null);
        log(cmdl.describeCommand(), Project.MSG_VERBOSE);
        process.setCommandline(cmdl.getCommandline());

        try {
            if (process.execute() != 0) {
                throw new BuildException("JJDoc failed.");
            }
        } catch (IOException e) {
            throw new BuildException("Failed to launch JJDoc", e);
        }
    }

    private String createOutputFileName(File destFile, String optionalOutputFile,
                                        boolean plain) {
        String suffix = DEFAULT_SUFFIX_HTML;
        String javaccFile = destFile.getAbsolutePath().replace('\\', '/');

        if (plain) {
            suffix = DEFAULT_SUFFIX_TEXT;
        }

        if ((optionalOutputFile == null) || optionalOutputFile.equals("")) {
            int filePos = javaccFile.lastIndexOf("/");

            if (filePos >= 0) {
                javaccFile = javaccFile.substring(filePos + 1);
            }

            int suffixPos = javaccFile.lastIndexOf('.');

            if (suffixPos == -1) {
                optionalOutputFile = javaccFile + suffix;
            } else {
                String currentSuffix = javaccFile.substring(suffixPos);

                if (currentSuffix.equals(suffix)) {
                    optionalOutputFile = javaccFile + suffix;
                } else {
                    optionalOutputFile = javaccFile.substring(0, suffixPos)
                        + suffix;
                }
            }
        } else {
            optionalOutputFile = optionalOutputFile.replace('\\', '/');
        }

        return (getProject().getBaseDir() + "/" + optionalOutputFile)
            .replace('\\', '/');
    }
}