/*
 *  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.types.resources.selectors;

import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.types.Resource;
import org.apache.tools.ant.types.EnumeratedAttribute;

/**
 * Type file/dir ResourceSelector.
 * @since Ant 1.7
 */
public class Type implements ResourceSelector {

    private static final String FILE_ATTR = "file";
    private static final String DIR_ATTR = "dir";

    /** Static file type selector. */
    public static final Type FILE = new Type(new FileDir(FILE_ATTR));

    /** Static dir type selector. */
    public static final Type DIR = new Type(new FileDir(DIR_ATTR));

    /**
     * Implements the type attribute.
     */
    public static class FileDir extends EnumeratedAttribute {
        private static final String[] VALUES = new String[] {FILE_ATTR, DIR_ATTR};

        /**
         * Default constructor.
         */
        public FileDir() {
        }

        /**
         * Convenience constructor.
         * @param value the String EnumeratedAttribute value.
         */
        public FileDir(String value) {
            setValue(value);
        }

        /**
         * Return the possible values.
         * @return a String array.
         */
        public String[] getValues() {
            return VALUES;
        }
    }

    private FileDir type = null;

    /**
     * Default constructor.
     */
    public Type() {
    }

    /**
     * Convenience constructor.
     * @param fd the FileDir type.
     */
    public Type(FileDir fd) {
        setType(fd);
    }

    /**
     * Set type; file|dir.
     * @param fd a FileDir object.
     */
    public void setType(FileDir fd) {
        type = fd;
    }

    /**
     * Return true if this Resource is selected.
     * @param r the Resource to check.
     * @return whether the Resource was selected.
     */
    public boolean isSelected(Resource r) {
        if (type == null) {
            throw new BuildException("The type attribute is required.");
        }
        int i = type.getIndex();
        return r.isDirectory() ? i == 1 : i == 0;
    }

}