trunk/proposal/sandbox/selectors/src/main/org/apache/tools/ant/types/ZipScanner.java

/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2001 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.types;

import org.apache.tools.ant.DirectoryScanner;
import org.apache.tools.ant.types.Pattern;
import java.io.File;

/**
 * ZipScanner accesses the pattern matching algorithm in DirectoryScanner,
 * which are protected methods that can only be accessed by subclassing.
 *
 * This implementation of FileScanner defines getIncludedFiles to return
 * only the Zip File which is being scanned, not the matching Zip entries.
 * Arguably, it should return the matching entries, however this would
 * complicate existing code which assumes that FileScanners return a
 * set of file system files that can be accessed directly.
 *
 */
public class ZipScanner extends DirectoryScanner {

    /**
     * The zip file which should be scanned.
     */
    protected File srcFile;

    /**
     * Sets the srcFile for scanning. This is the jar or zip file that is scanned
     * for matching entries.
     *
     * @param srcFile the (non-null) zip file name for scanning
     */
    public void setSrc(File srcFile) {
        this.srcFile = srcFile;
    }

    /**
     * Returns the zip file itself, not the matching entries within the zip file.
     * This keeps the uptodate test in the Zip task simple; otherwise we'd need
     * to treat zip filesets specially.
     *
     * @return the source file from which entries will be extracted.
     */
    public String[] getIncludedFiles() {
        String[] result = new String[1];
        result[0] = srcFile.getAbsolutePath();
        return result;
    }

    /**
     * Returns an empty list of directories to create.
     */
    public String[] getIncludedDirectories() {
        return new String[0];
    }

    /**
     * Initialize DirectoryScanner data structures.
     */
    public void init() {
        if (includes == null) {
            // No includes supplied, so set it to 'matches all'
            includes = new Pattern[1];
            includes[0] = new Pattern();
            includes[0].setPattern("**");
        }
        if (excludes == null) {
            excludes = new Pattern[0];
        }
    }

    /**
     * Matches a jar entry against the includes/excludes list,
     * normalizing the path separator.
     *
     * @param path the (non-null) path name to test for inclusion
     *
     * @return <code>true</code> if the path should be included
     *         <code>false</code> otherwise.
     */
    public boolean match(String path) {
        String vpath = path.replace('/', File.separatorChar).
            replace('\\', File.separatorChar);
        return isIncluded(vpath) && !isExcluded(vpath);
    }

}