src/main/org/apache/tools/ant/taskdefs/optional/extension/resolvers/URLResolver.java

/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2002 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Ant", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
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.
 *
 * @author <a href="mailto:peter@apache.org">Peter Donald</a>
 * @author <a href="mailto:jeff@socialchange.net.au">Jeff Turner</>
 * @version $Revision$ $Date$
 */
public class URLResolver
    implements ExtensionResolver
{
    private File m_destfile;
    private File m_destdir;
    private URL m_url;

    public void setUrl( final URL url )
    {
        m_url = url;
    }

    public void setDestfile( final File destfile )
    {
        m_destfile = destfile;
    }

    public void setDestdir( final File destdir )
    {
        m_destdir = destdir;
    }

    public File resolve( final Extension extension,
                         final Project project )
        throws BuildException
    {
        validate();

        final File file = getDest();

        final Get get = (Get)project.createTask( "get" );
        get.setDest( file );
        get.setSrc( m_url );
        get.execute();

        return file;
    }

    private File getDest()
    {
        if( null != m_destfile )
        {
            return m_destfile;
        }
        else
        {
            final String file = m_url.getFile();
            String filename = null;
            if( null == file || file.length() <= 1 )
            {
                filename = "default.file";
            }
            else
            {
                int index = file.lastIndexOf( '/' );
                if( -1 == index )
                {
                    index = 0;
                }
                filename = file.substring( index );
            }

            return new File( m_destdir, filename );
        }
    }

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

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

    public String toString()
    {
        return "URL[" + m_url + "]";
    }
}