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Ant example source code file (URLResolver.java)

This example Ant source code file (URLResolver.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, extension, extensionresolver, file, file, get, io, must, net, network, project, string, string, url, url, urlresolver

The URLResolver.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.extension.resolvers;

import java.io.File;
import java.net.URL;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.taskdefs.Get;
import org.apache.tools.ant.taskdefs.optional.extension.Extension;
import org.apache.tools.ant.taskdefs.optional.extension.ExtensionResolver;

/**
 * Resolver that just returns s specified location.
 *
 */
public class URLResolver implements ExtensionResolver {
    private File destfile;
    private File destdir;
    private URL url;

    /**
     * Sets the URL
     * @param url the url
     */
    public void setUrl(final URL url) {
        this.url = url;
    }

    /**
     * Sets the destination file
     * @param destfile the destination file
     */
    public void setDestfile(final File destfile) {
        this.destfile = destfile;
    }

    /**
     * Sets the destination directory
     * @param destdir the destination directory
     */
    public void setDestdir(final File destdir) {
        this.destdir = destdir;
    }

    /**
     * Returns the file resolved from URL and directory
     * @param extension the extention
     * @param project the project
     * @return file the file resolved
     * @throws BuildException if the URL is invalid
     */
    public File resolve(final Extension extension,
                         final Project project) throws BuildException {
        validate();

        final File file = getDest();

        final Get get = new Get();
        get.setProject(project);
        get.setDest(file);
        get.setSrc(url);
        get.execute();

        return file;
    }

    /*
     * Gets the destination file
     */
    private File getDest() {
        File result;
        if (null != destfile) {
            result = destfile;
        } else {
            final String file = url.getFile();
            String filename;
            if (null == file || file.length() <= 1) {
                filename = "default.file";
            } else {
                int index = file.lastIndexOf('/');
                if (-1 == index) {
                    index = 0;
                }
                filename = file.substring(index);
            }
            result = new File(destdir, filename);
        }
        return result;
    }

    /*
     * Validates URL
     */
    private void validate() {
        if (null == url) {
            final String message = "Must specify URL";
            throw new BuildException(message);
        }

        if (null == destdir && null == destfile) {
            final String message = "Must specify destination file or directory";
            throw new BuildException(message);
        } else if (null != destdir && null != destfile) {
            final String message = "Must not specify both destination file or directory";
            throw new BuildException(message);
        }
    }

    /**
     * Returns a string representation of the URL
     * @return the string representation
     */
    public String toString() {
        return "URL[" + url + "]";
    }
}

Other Ant examples (source code examples)

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

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