    001// Copyright 2009 The Apache Software Foundation
    002//
    003// Licensed under the Apache License, Version 2.0 (the "License");
    004// you may not use this file except in compliance with the License.
    005// You may obtain a copy of the License at
    006//
    007//     http://www.apache.org/licenses/LICENSE-2.0
    008//
    009// Unless required by applicable law or agreed to in writing, software
    010// distributed under the License is distributed on an "AS IS" BASIS,
    011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    012// See the License for the specific language governing permissions and
    013// limitations under the License.
    014package org.apache.tapestry5.ioc;
    015
    016import java.util.ArrayList;
    017import java.util.List;
    018
    019import org.apache.tapestry5.commons.OrderedConfiguration;
    020
    021/**
    022 * Represents an order constraints for {@link OrderedConfiguration}.
    023 *
    024 * @since 5.2.0.0
    025 */
    026public class OrderConstraint
    027{
    028    private static final String ALL = "*";
    029
    030    private List<String> constraints = new ArrayList<String>();
    031
    032    /**
    033     * Adds an <i>after:id</i> constraint.
    034     */
    035    public OrderConstraint after(String id)
    036    {
    037        constraints.add("after:" + id);
    038
    039        return this;
    040    }
    041
    042    /**
    043     * Adds an <i>after:*</i> constraint.
    044     */
    045    public OrderConstraint afterAll()
    046    {
    047        return after(ALL);
    048    }
    049    /**
    050     * Adds a <i>before:id</i> constraint.
    051     */
    052    public OrderConstraint before(String id)
    053    {
    054        constraints.add("before:" + id);
    055
    056        return this;
    057    }
    058
    059    /**
    060     * Adds a <i>before:*</i> constraint.
    061     */
    062    public OrderConstraint beforeAll()
    063    {
    064        return before(ALL);
    065    }
    066
    067    /**
    068     * Returns all constraints as array of strings.
    069     */
    070    public String[] build()
    071    {
    072        return constraints.toArray(new String[]{});
    073    }
    074}