/*
 *  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.util;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.apache.tools.ant.types.Mapper;

A FileNameMapper that contains
other FileNameMappers.
See Also:
FileNameMapper/**
 * A <code>FileNameMapper</code> that contains
 * other <code>FileNameMapper</code>s.
 * @see FileNameMapper
 */
public abstract class ContainerMapper implements FileNameMapper {

    private List<FileNameMapper> mappers = new ArrayList<>();

    
Add a Mapper.
Params:
mapper – the Mapper to add./**
     * Add a <code>Mapper</code>.
     * @param mapper the <code>Mapper</code> to add.
     */
    public void addConfiguredMapper(Mapper mapper) {
        add(mapper.getImplementation());
    }

    
An add configured version of the add method.
This class used to contain an add method and an
addConfiguredMapper method. Dur to ordering,
the add method was always called first. This
addConfigured method has been added to allow
chaining to work correctly.
Params:
fileNameMapper – a FileNameMapper./**
     * An add configured version of the add method.
     * This class used to contain an add method and an
     * addConfiguredMapper method. Dur to ordering,
     * the add method was always called first. This
     * addConfigured method has been added to allow
     * chaining to work correctly.
     * @param fileNameMapper a <code>FileNameMapper</code>.
     */
    public void addConfigured(FileNameMapper fileNameMapper) {
        add(fileNameMapper);
    }

    
Add a FileNameMapper.
Params:
fileNameMapper – a FileNameMapper.
Throws:
IllegalArgumentException – if attempting to add this
        ContainerMapper to itself, or if the specified
        FileNameMapper is itself a ContainerMapper
        that contains this ContainerMapper./**
     * Add a <code>FileNameMapper</code>.
     * @param fileNameMapper a <code>FileNameMapper</code>.
     * @throws IllegalArgumentException if attempting to add this
     *         <code>ContainerMapper</code> to itself, or if the specified
     *         <code>FileNameMapper</code> is itself a <code>ContainerMapper</code>
     *         that contains this <code>ContainerMapper</code>.
     */
    public synchronized void add(FileNameMapper fileNameMapper) {
        if (this == fileNameMapper
            || (fileNameMapper instanceof ContainerMapper
            && ((ContainerMapper) fileNameMapper).contains(this))) {
            throw new IllegalArgumentException(
                "Circular mapper containment condition detected");
        }
        mappers.add(fileNameMapper);
    }

    
Return true if this ContainerMapper or any of
its sub-elements contains the specified FileNameMapper.
Params:
fileNameMapper –   the FileNameMapper to search for.
Returns:
boolean./**
     * Return <code>true</code> if this <code>ContainerMapper</code> or any of
     * its sub-elements contains the specified <code>FileNameMapper</code>.
     * @param fileNameMapper   the <code>FileNameMapper</code> to search for.
     * @return <code>boolean</code>.
     */
    protected synchronized boolean contains(FileNameMapper fileNameMapper) {
        for (FileNameMapper m : mappers) {
            if (m == fileNameMapper) {
                return true;
            }
            if (m instanceof ContainerMapper
                && ((ContainerMapper) m).contains(fileNameMapper)) {
                return true;
            }
        }
        return false;
    }

    
Get the List of FileNameMappers.
Returns:
List./**
     * Get the <code>List</code> of <code>FileNameMapper</code>s.
     * @return <code>List</code>.
     */
    public synchronized List<FileNameMapper> getMappers() {
        return Collections.unmodifiableList(mappers);
    }

    
Empty implementation.
Params:
ignore – ignored./**
     * Empty implementation.
     * @param ignore ignored.
     */
    @Override
    public void setFrom(String ignore) {
        //Empty
    }

    
Empty implementation.
Params:
ignore – ignored./**
     * Empty implementation.
     * @param ignore ignored.
     */
    @Override
    public void setTo(String ignore) {
        //Empty
    }

}