Ant example source code file (IPlanetEjbcTask.java)

This example Ant source code file (IPlanetEjbcTask.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, ejb, file, file, io, iplanetejbc, parser, path, sax, saxexception, saxparser, string, string, the, the, xml, xml

The IPlanetEjbcTask.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.ejb;

import java.io.File;
import java.io.IOException;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.types.Path;
import org.xml.sax.SAXException;

/**
 * Compiles EJB stubs and skeletons for the iPlanet Application Server.
 * The EJBs to be processed are specified by the EJB 1.1 standard XML
 * descriptor, and additional attributes are obtained from the iPlanet Application
 * Server-specific XML descriptor.  Since the XML descriptors can include
 * multiple EJBs, this is a convenient way of specifying many EJBs in a single
 * Ant task.  The following attributes are allowed:
 *   <ul>
 *     <li>ejbdescriptor -- Standard EJB 1.1 XML descriptor (typically
 *                                 titled "ejb-jar.xml").  This attribute is
 *                                 required.
 *     <li>iasdescriptor -- EJB XML descriptor for iPlanet Application
 *                                 Server (typically titled "ias-ejb-jar.xml).
 *                                 This attribute is required.
 *     <li>dest -- The is the base directory where the RMI stubs and
 *                        skeletons are written.  In addition, the class files
 *                        for each bean (home interface, remote interface, and
 *                        EJB implementation) must be found in this directory.
 *                        This attribute is required.
 *     <li>classpath -- The classpath used when generating EJB stubs and
 *                             skeletons.  This is an optional attribute (if
 *                             omitted, the classpath specified when Ant was
 *                             started will be used).  Nested "classpath"
 *                             elements may also be used.
 *     <li>keepgenerated -- Indicates whether or not the Java source
 *                                 files which are generated by ejbc will be
 *                                 saved or automatically deleted.  If "yes",
 *                                 the source files will be retained.  This is
 *                                 an optional attribute (if omitted, it
 *                                 defaults to "no").
 *     <li>debug -- Indicates whether or not the ejbc utility should
 *                         log additional debugging statements to the standard
 *                         output.  If "yes", the additional debugging statements
 *                         will be generated (if omitted, it defaults to "no").
 *     <li>iashome -- May be used to specify the "home" directory for
 *                           this iPlanet Application Server installation.  This
 *                           is used to find the ejbc utility if it isn't
 *                           included in the user's system path.  This is an
 *                           optional attribute (if specified, it should refer
 *                           to the <code>[install-location]/iplanet/ias6/ias
 *                           </code> directory).  If omitted, the ejbc utility
 *                           must be on the user's system path.
 *   </ul>
 * <p>
 * For each EJB specified, this task will locate the three classes that comprise
 * the EJB.  If these class files cannot be located in the <code>dest
 * directory, the task will fail.  The task will also attempt to locate the EJB
 * stubs and skeletons in this directory.  If found, the timestamps on the
 * stubs and skeletons will be checked to ensure they are up to date.  Only if
 * these files cannot be found or if they are out of date will ejbc be called
 * to generate new stubs and skeletons.
 *
 * @see    IPlanetEjbc
 *
 * @ant.task name="iplanet-ejbc" category="ejb"
 */
public class IPlanetEjbcTask extends Task {

    /* Attributes set by the Ant build file */
    private File    ejbdescriptor;
    private File    iasdescriptor;
    private File    dest;
    private Path    classpath;
    private boolean keepgenerated = false;
    private boolean debug         = false;
    private File    iashome;

    /**
     * Sets the location of the standard XML EJB descriptor.  Typically, this
     * file is named "ejb-jar.xml".
     *
     * @param ejbdescriptor The name and location of the EJB descriptor.
     */
    public void setEjbdescriptor(File ejbdescriptor) {
        this.ejbdescriptor = ejbdescriptor;
    }

    /**
     * Sets the location of the iAS-specific XML EJB descriptor.  Typically,
     * this file is named "ias-ejb-jar.xml".
     *
     * @param iasdescriptor The name and location of the iAS-specific EJB
     *                      descriptor.
     */
    public void setIasdescriptor (File iasdescriptor) {
        this.iasdescriptor = iasdescriptor;
    }

    /**
     * Sets the destination directory where the EJB source classes must exist
     * and where the stubs and skeletons will be written.  The destination
     * directory must exist before this task is executed.
     *
     * @param dest The directory where the compiled classes will be written.
     */
    public void setDest(File dest) {
        this.dest = dest;
    }

    /**
     * Sets the classpath to be used when compiling the EJB stubs and skeletons.
     *
     * @param classpath The classpath to be used.
     */
    public void setClasspath(Path classpath) {
        if (this.classpath == null) {
            this.classpath = classpath;
        } else {
            this.classpath.append(classpath);
        }
    }

    /**
     * Adds to the classpath used when compiling the EJB stubs and skeletons.
     * @return the class path.
     */
    public Path createClasspath() {
        if (classpath == null) {
            classpath = new Path(getProject());
        }
        return classpath.createPath();
    }

    /**
     * If true, the Java source files which are generated by ejbc will be saved .
     *
     * @param keepgenerated A boolean indicating if the Java source files for
     *                      the stubs and skeletons should be retained.
     */
    public void setKeepgenerated(boolean keepgenerated) {
        this.keepgenerated = keepgenerated;
    }

    /**
     * If true, debugging output will be generated when ejbc is
     * executed.
     *
     * @param debug A boolean indicating if debugging output should be generated
     */
    public void setDebug(boolean debug) {
        this.debug = debug;
    }

    /**
     * May be used to specify the "home" directory for this iAS installation.
     * The directory specified should typically be
     * <code>[install-location]/iplanet/ias6/ias.
     *
     * @param iashome The home directory for the user's iAS installation.
     */
    public void setIashome(File iashome) {
        this.iashome = iashome;
    }

    /**
     * Does the work.
     * @throws BuildException if there is a problem.
     */
    public void execute() throws BuildException {
        checkConfiguration();

        executeEjbc(getParser());
    }

    /**
     * Verifies that the user selections are valid.
     *
     * @throws BuildException If the user selections are invalid.
     */
    private void checkConfiguration() throws BuildException {

        if (ejbdescriptor == null) {
            String msg = "The standard EJB descriptor must be specified using "
                            + "the \"ejbdescriptor\" attribute.";
            throw new BuildException(msg, getLocation());
        }
        if ((!ejbdescriptor.exists()) || (!ejbdescriptor.isFile())) {
            String msg = "The standard EJB descriptor (" + ejbdescriptor
                            + ") was not found or isn't a file.";
            throw new BuildException(msg, getLocation());
        }

        if (iasdescriptor == null) {
            String msg = "The iAS-speific XML descriptor must be specified using"
                            + " the \"iasdescriptor\" attribute.";
            throw new BuildException(msg, getLocation());
        }
        if ((!iasdescriptor.exists()) || (!iasdescriptor.isFile())) {
            String msg = "The iAS-specific XML descriptor (" + iasdescriptor
                            + ") was not found or isn't a file.";
            throw new BuildException(msg, getLocation());
        }

        if (dest == null) {
            String msg = "The destination directory must be specified using "
                            + "the \"dest\" attribute.";
            throw new BuildException(msg, getLocation());
        }
        if ((!dest.exists()) || (!dest.isDirectory())) {
            String msg = "The destination directory (" + dest + ") was not "
                            + "found or isn't a directory.";
            throw new BuildException(msg, getLocation());
        }

        if ((iashome != null) && (!iashome.isDirectory())) {
            String msg = "If \"iashome\" is specified, it must be a valid "
                            + "directory (it was set to " + iashome + ").";
            throw new BuildException(msg, getLocation());
        }
    }

    /**
     * Returns a SAXParser that may be used to process the XML descriptors.
     *
     * @return Parser which may be used to process the EJB descriptors.
     * @throws BuildException If the parser cannot be created or configured.
     */
    private SAXParser getParser() throws BuildException {

        SAXParser saxParser = null;
        try {
            SAXParserFactory saxParserFactory = SAXParserFactory.newInstance();
            saxParserFactory.setValidating(true);
            saxParser = saxParserFactory.newSAXParser();
        } catch (SAXException e) {
            String msg = "Unable to create a SAXParser: " + e.getMessage();
            throw new BuildException(msg, e, getLocation());
        } catch (ParserConfigurationException e) {
            String msg = "Unable to create a SAXParser: " + e.getMessage();
            throw new BuildException(msg, e, getLocation());
        }

        return saxParser;
    }

    /**
     * Executes the EJBc utility using the SAXParser provided.
     *
     * @param saxParser SAXParser that may be used to process the EJB
     *                  descriptors
     * @throws BuildException If there is an error reading or parsing the XML
     *                        descriptors
     */
    private void executeEjbc(SAXParser saxParser) throws BuildException {
        IPlanetEjbc ejbc = new IPlanetEjbc(ejbdescriptor,
                                            iasdescriptor,
                                            dest,
                                            getClasspath().toString(),
                                            saxParser);
        ejbc.setRetainSource(keepgenerated);
        ejbc.setDebugOutput(debug);
        if (iashome != null) {
            ejbc.setIasHomeDir(iashome);
        }

        try {
            ejbc.execute();
        } catch (IOException e) {
            String msg = "An IOException occurred while trying to read the XML "
                            + "descriptor file: " + e.getMessage();
            throw new BuildException(msg, e, getLocation());
        } catch (SAXException e) {
            String msg = "A SAXException occurred while trying to read the XML "
                            + "descriptor file: " + e.getMessage();
            throw new BuildException(msg, e, getLocation());
        } catch (IPlanetEjbc.EjbcException e) {
            String msg = "An exception occurred while trying to run the ejbc "
                            + "utility: " + e.getMessage();
            throw new BuildException(msg, e, getLocation());
        }
    }

    /**
     * Returns the CLASSPATH to be used when calling EJBc.  If no user CLASSPATH
     * is specified, the System classpath is returned instead.
     *
     * @return Path The classpath to be used for EJBc.
     */
    private Path getClasspath() {
        Path cp = null;
        if (classpath == null) {
            cp = (new Path(getProject())).concatSystemClasspath("last");
        } else {
            cp = classpath.concatSystemClasspath("ignore");
        }

        return cp;
    }
}