alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Ant example source code file (DefBase.java)

This example Ant source code file (DefBase.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

antclassloader, antlibdefinition, buildexception, classloader, classloader, defbase, deprecated, it, path, path, string, string, the, the

The DefBase.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;

import org.apache.tools.ant.AntClassLoader;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.types.Path;
import org.apache.tools.ant.types.Reference;
import org.apache.tools.ant.util.ClasspathUtils;

/**
 * Base class for Definitions handling uri and class loading.
 * (This was part of Definer)
 *
 * @since Ant 1.6
 */
public abstract class DefBase extends AntlibDefinition {
    private ClassLoader createdLoader;
    private ClasspathUtils.Delegate cpDelegate;

    /**
     * Check if classpath attributes have been set.
     * (to be called before getCpDelegate() is used.
     * @return true if cpDelegate has been created.
     */
    protected boolean hasCpDelegate() {
        return cpDelegate != null;
    }

    /**
     * @param reverseLoader if true a delegated loader will take precedence over
     *                      the parent
     * @deprecated since 1.6.x.
     *             stop using this attribute
     * @ant.attribute ignore="true"
     */
    public void setReverseLoader(boolean reverseLoader) {
        getDelegate().setReverseLoader(reverseLoader);
        log("The reverseloader attribute is DEPRECATED. It will be removed",
            Project.MSG_WARN);
    }

    /**
     * @return the classpath for this definition
     */
    public Path getClasspath() {
        return getDelegate().getClasspath();
    }

    /**
     * @return the reverse loader attribute of the classpath delegate.
     */
    public boolean isReverseLoader() {
        return getDelegate().isReverseLoader();
    }

    /**
     * Returns the loader id of the class path Delegate.
     * @return the loader id
     */
    public String getLoaderId() {
        return getDelegate().getClassLoadId();
    }

    /**
     * Returns the class path id of the class path delegate.
     * @return the class path id
     */
    public String getClasspathId() {
        return getDelegate().getClassLoadId();
    }

    /**
     * Set the classpath to be used when searching for component being defined.
     *
     * @param classpath an Ant Path object containing the classpath.
     */
    public void setClasspath(Path classpath) {
        getDelegate().setClasspath(classpath);
    }

    /**
     * Create the classpath to be used when searching for component being
     * defined.
     * @return the classpath of the this definition
     */
    public Path createClasspath() {
        return getDelegate().createClasspath();
    }

    /**
     * Set a reference to a classpath to use when loading the files.
     * To actually share the same loader, set loaderref as well
     * @param r the reference to the classpath
     */
    public void setClasspathRef(Reference r) {
        getDelegate().setClasspathref(r);
    }

    /**
     * Use the reference to locate the loader. If the loader is not
     * found, the specified classpath will be used and registered
     * with the specified name.
     *
     * This allows multiple taskdef/typedef to use the same class loader,
     * so they can be used together, eliminating the need to
     * put them in the CLASSPATH.
     *
     * @param r the reference to locate the loader.
     * @since Ant 1.5
     */
    public void setLoaderRef(Reference r) {
        getDelegate().setLoaderRef(r);
    }

    /**
     * create a classloader for this definition
     * @return the classloader from the cpDelegate
     */
    protected ClassLoader createLoader() {
        if (getAntlibClassLoader() != null && cpDelegate == null) {
            return getAntlibClassLoader();
        }
        if (createdLoader == null) {
            createdLoader = getDelegate().getClassLoader();
            // need to load Task via system classloader or the new
            // task we want to define will never be a Task but always
            // be wrapped into a TaskAdapter.
            ((AntClassLoader) createdLoader)
                .addSystemPackageRoot("org.apache.tools.ant");
        }
        return createdLoader;
    }

    /**
     * @see org.apache.tools.ant.Task#init()
     * @throws BuildException on error.
     * @since Ant 1.6
     */
    public void init() throws BuildException {
        super.init();
    }

    private ClasspathUtils.Delegate getDelegate() {
        if (cpDelegate == null) {
            cpDelegate = ClasspathUtils.getDelegate(this);
        }
        return cpDelegate;
    }
}

Other Ant examples (source code examples)

Here is a short list of links related to this Ant DefBase.java source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.