001    /*
002     * Jpkg - Java library and tools for operating system package creation.
003     *
004     * Copyright (c) 2007 Three Rings Design, Inc.
005     * All rights reserved.
006     *
007     * Redistribution and use in source and binary forms, with or without
008     * modification, are permitted provided that the following conditions
009     * are met:
010     * 1. Redistributions of source code must retain the above copyright
011     *    notice, this list of conditions and the following disclaimer.
012     * 2. Redistributions in binary form must reproduce the above copyright
013     *    notice, this list of conditions and the following disclaimer in the
014     *    documentation and/or other materials provided with the distribution.
015     * 3. Neither the name of the copyright owner nor the names of contributors
016     *    may be used to endorse or promote products derived from this software
017     *    without specific prior written permission.
018     *
019     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
020     * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
021     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
022     * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
023     * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
024     * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
025     * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
026     * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
027     * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
028     * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
029     * POSSIBILITY OF SUCH DAMAGE.
030     */
031    package com.threerings.jpkg.debian.dependency;
032    
033    import java.util.ArrayList;
034    import java.util.List;
035    
036    import com.threerings.jpkg.debian.ControlFileData;
037    
038    /**
039     * A generic class which holds {@link ControlFileDependency} objects. These can be used to describe
040     * various Debian package dependency relationships, such as Depends, Conflicts, and Replaces.
041     * @see <a href="http://www.debian.org/doc/debian-policy/ch-relationships.html#s-binarydeps">Debian Policy Manual</a>
042     */
043    public abstract class DependencyContainer
044        implements ControlFileData
045    {
046        /**
047         * Returns the number of dependencies defined.
048         */
049        public int size ()
050        {
051            return _dependencies.size();
052        }
053    
054        /**
055         * Concrete classes may us this to add a generic dependency object to this list of dependencies.
056         */
057        protected void add (ControlFileDependency dependency)
058        {
059            _dependencies.add(dependency);
060        }
061    
062        // from ControlFileData
063        public abstract String getField ();
064    
065        // from ControlFileData
066        public String getFieldValue ()
067        {
068            final StringBuilder builder = new StringBuilder();
069            for (final ControlFileDependency dependency : _dependencies) {
070                if (builder.length() > 0) {
071                    builder.append(", ");
072                }
073                builder.append(dependency.asString());
074            }
075            return builder.toString();
076        }
077    
078        /** The list of dependencies. */
079        private final List<ControlFileDependency> _dependencies = new ArrayList<ControlFileDependency>();
080    }