proposal/sandbox/selectors/src/main/org/apache/tools/ant/selectors/FileTypeSelector.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
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 *
 * 5. Products derived from this software may not be called "Apache"
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 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * 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.selectors;

import java.io.File;

/**
 * File selector that performs selection based on
 * file type - file and directory.
 *
 * @author <a href="mailto:umagesh@apache.org">Magesh Umasankar</a>
 */
public class FileTypeSelector implements FileSelector {
    private String value = null;
    private String operation = "equals";
    private boolean cached = false;
    private boolean negate = false;
    private boolean checkForFile = false;
    private boolean checkForDir = false;

    public void setCached(final boolean cached) {
        this.cached = cached;
    }

    public boolean isCached() {
        return cached;
    }

    public void setValue(final String value) {
        this.value = value;
        setCached(false);
    }

    public void setOperation(final String operation) {
        this.operation = operation;
        setCached(false);
    }

    public void doCache() {
        if (!isCached()) {
            if (value == null) {
                throw new NullPointerException("value must not be null.");
            }
            if (value.equalsIgnoreCase("file")) {
                checkForFile = true;
                checkForDir = false;
            } else if (value.equalsIgnoreCase("directory")) {
                checkForDir = true;
                checkForFile = false;
            }
            if (!operation.equalsIgnoreCase("equals")) {
                negate = true;
            } else {
                negate = false;
            }
            setCached(true);
        }
    }

    public boolean isSelected(final String file) {
        doCache();
        if (file == null) {
            throw new NullPointerException("file must not be null.");
        }
        boolean retValue = false;
        File f = new File(file);
        if (checkForFile) {
            retValue = f.isFile();
        } else if (checkForDir) {
            retValue = f.isDirectory();
        }
        if (negate) {
            retValue = !retValue;
        }
        return retValue;
    }
}