Ant example source code file (JavahAdapterFactory.java)

This example Ant source code file (JavahAdapterFactory.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, javahadapter, javahadapter, javahadapterfactory, kaffeh, projectcomponent, projectcomponent, string, sunjavah, sunjavah

The JavahAdapterFactory.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.javah;

import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.ProjectComponent;
import org.apache.tools.ant.util.ClasspathUtils;
import org.apache.tools.ant.util.JavaEnvUtils;

/**
 * Creates the JavahAdapter based on the user choice and
 * potentially the VM vendor.
 *
 * @since Ant 1.6.3
 */
public class JavahAdapterFactory {

    /**
     * Determines the default choice of adapter based on the VM
     * vendor.
     *
     * @return the default choice of adapter based on the VM
     * vendor
     */
    public static String getDefault() {
        if (JavaEnvUtils.isKaffe()) {
            return Kaffeh.IMPLEMENTATION_NAME;
        }
        return SunJavah.IMPLEMENTATION_NAME;
    }

    /**
     * Creates the JavahAdapter based on the user choice and
     * potentially the VM vendor.
     *
     * @param choice the user choice (if any).
     * @param log a ProjectComponent instance used to access Ant's
     * logging system.
     * @return The adapter to use.
     * @throws BuildException if there is an error.
     */
    public static JavahAdapter getAdapter(String choice,
                                          ProjectComponent log)
        throws BuildException {
        if ((JavaEnvUtils.isKaffe() && choice == null)
            || Kaffeh.IMPLEMENTATION_NAME.equals(choice)) {
            return new Kaffeh();
        } else if (SunJavah.IMPLEMENTATION_NAME.equals(choice)) {
            return new SunJavah();
        } else if (choice != null) {
            return resolveClassName(choice);
        }

        // This default has been good enough until Ant 1.6.3, so stick
        // with it
        return new SunJavah();
    }

    /**
     * Tries to resolve the given classname into a javah adapter.
     * Throws a fit if it can't.
     *
     * @param className The fully qualified classname to be created.
     * @throws BuildException This is the fit that is thrown if className
     * isn't an instance of JavahAdapter.
     */
    private static JavahAdapter resolveClassName(String className)
            throws BuildException {
        return (JavahAdapter) ClasspathUtils.newInstance(className,
                JavahAdapterFactory.class.getClassLoader(), JavahAdapter.class);
    }
}