/*
 *  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
 *
 *      https://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.optional;

import java.util.ArrayList;

import org.apache.tools.ant.util.FileNameMapper;

Script support at map time.
Since:
Ant1.7/**
 * Script support at map time.
 * @since Ant1.7
 */
public class ScriptMapper extends AbstractScriptComponent implements FileNameMapper {

    private ArrayList<String> files;


    
Sets the from part of the transformation rule.
Params:
from – a string./**
     * Sets the from part of the transformation rule.
     *
     * @param from a string.
     */
    @Override
    public void setFrom(String from) {
    }

    
Sets the to part of the transformation rule.
Params:
to – a string./**
     * Sets the to part of the transformation rule.
     *
     * @param to a string.
     */
    @Override
    public void setTo(String to) {
    }

    
Reset the list of files
/**
     * Reset the list of files
     */
    public void clear() {
        files = new ArrayList<>(1);
    }

    
Add a mapped name
Params:
mapping – the value to use./**
     * Add a mapped name
     * @param mapping the value to use.
     */
    public void addMappedName(String mapping) {
        files.add(mapping);
    }

    
Returns an array containing the target filename(s) for the given source
file.
if the given rule doesn't apply to the source file, implementation
must return null. SourceFileScanner will then omit the source file in
question.
Params:
sourceFileName – the name of the source file relative to some given
                      basedirectory.
Returns:
an array of strings if the rule applies to the source file, or
        null if it does not./**
     * Returns an array containing the target filename(s) for the given source
     * file.
     *
     * <p>if the given rule doesn't apply to the source file, implementation
     * must return null. SourceFileScanner will then omit the source file in
     * question.</p>
     *
     * @param sourceFileName the name of the source file relative to some given
     *                       basedirectory.
     * @return an array of strings if the rule applies to the source file, or
     *         null if it does not.
     */

    @Override
    public String[] mapFileName(String sourceFileName) {
        initScriptRunner();
        getRunner().addBean("source", sourceFileName);
        clear();
        executeScript("ant_mapper");
        if (files.isEmpty()) {
            return null;
        }
        return files.toArray(new String[files.size()]);
    }
}