001: /*
002: * ====================================================================
003: *
004: * The Apache Software License, Version 1.1
005: *
006: * Copyright (c) 1999-2003 The Apache Software Foundation.
007: * All rights reserved.
008: *
009: * Redistribution and use in source and binary forms, with or without
010: * modification, are permitted provided that the following conditions
011: * are met:
012: *
013: * 1. Redistributions of source code must retain the above copyright
014: * notice, this list of conditions and the following disclaimer.
015: *
016: * 2. Redistributions in binary form must reproduce the above copyright
017: * notice, this list of conditions and the following disclaimer in
018: * the documentation and/or other materials provided with the
019: * distribution.
020: *
021: * 3. The end-user documentation included with the redistribution, if
022: * any, must include the following acknowledgement:
023: * "This product includes software developed by the
024: * Apache Software Foundation (http://www.apache.org/)."
025: * Alternately, this acknowledgement may appear in the software itself,
026: * if and wherever such third-party acknowledgements normally appear.
027: *
028: * 4. The names "The Jakarta Project", "Commons", and "Apache Software
029: * Foundation" must not be used to endorse or promote products derived
030: * from this software without prior written permission. For written
031: * permission, please contact apache@apache.org.
032: *
033: * 5. Products derived from this software may not be called "Apache"
034: * nor may "Apache" appear in their names without prior written
035: * permission of the Apache Software Foundation.
036: *
037: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
038: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
039: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
040: * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
041: * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
042: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
043: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
044: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
045: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
046: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
047: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
048: * SUCH DAMAGE.
049: * ====================================================================
050: *
051: * This software consists of voluntary contributions made by many
052: * individuals on behalf of the Apache Software Foundation. For more
053: * information on the Apache Software Foundation, please see
054: * <http://www.apache.org/>.
055: *
056: */
057:
058: package org.apache.commons.jrcs.rcs;
059:
060: /**
061: * Represents a branch node in a version control archive.
062: * This class is NOT thread safe.
063: *
064: * <p>A {@link BranchNode BranchNode} stores the deltas between the previous revision
065: * and the current revision; that is, when the deltas are applied
066: * to the previous revision, the text of the current revision is obtained.
067: * The {@link Node#rcsnext rcsnext} field of a BranchNode points to
068: * the next revision in the branch.
069: * </p>
070: *
071: * @see Node
072: * @see Archive
073: *
074: * @author <a href="mailto:juanco@suigeneris.org">Juanco Anez</a>
075: * @version $Id: BranchNode.java 2967 2005-10-26 10:52:33Z ian@caret.cam.ac.uk $
076: */
077: class BranchNode extends Node {
078: /**
079: * Create a BranchNode with the given version number.
080: * The next field in a Branch node points to the next higher
081: * revision on the same branch.
082: * @param vernum the version number for the node
083: * @param next the next node in the logical RCS hierarchy.
084: */
085: BranchNode(Version vernum, BranchNode next) {
086: super (vernum, next);
087: if (vernum == null) {
088: throw new IllegalArgumentException(vernum.toString());
089: }
090: }
091:
092: /**
093: * Return the last (leaf) node in the branch this node belongs to.
094: * @return The leaf node.
095: */
096: public BranchNode getLeafNode() {
097: BranchNode result = this ;
098: while (result.getRCSNext() != null) {
099: result = (BranchNode) result.getRCSNext();
100: }
101: return result;
102: }
103:
104: /**
105: * Set the next node in the RCS logical hierarcy.
106: * Update the _parent and _child node accordingly.
107: * For BranchNodes, the RCS-next is a child, that is,
108: * a node with a larger version number.
109: */
110: public void setRCSNext(Node node) {
111: super .setRCSNext(node);
112: if (this .getChild() != null) {
113: this .getChild().parent = null;
114: }
115: this .child = node;
116: if (this .getChild() != null) {
117: this .getChild().parent = this ;
118: }
119: }
120:
121: public Node deltaRevision() {
122: return this ;
123: }
124:
125: public Node nextInPathTo(Version vernum, boolean soft)
126: throws NodeNotFoundException {
127: Version branchPoint = vernum.getBase(this .version.size());
128: Version this Base = this .version.getBase(branchPoint.size());
129: if (this Base.isGreaterThan(branchPoint) && !soft) {
130: throw new NodeNotFoundException(vernum);
131: } //!!! InternalError, really
132:
133: if (this .version.equals(vernum)) {
134: return null;
135: } else if (this .version.isLessThan(branchPoint)) {
136: return getChild();
137: } else if (vernum.size() <= this .version.size()) {
138: if (vernum.size() < this .version.size()
139: || branchPoint.last() == 0) {
140: return getChild();
141: } // keep going
142: else {
143: return null;
144: }
145: } else {
146: Node branch = getBranch(vernum.at(this .version.size()));
147: if (branch != null || soft) {
148: return branch;
149: } else {
150: throw new BranchNotFoundException(vernum
151: .getBase(this .version.size() + 1));
152: }
153: }
154: }
155: }
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