Source Code Cross Referenced for Delta.java in  » ERP-CRM-Financial » sakai » org » apache » commons » jrcs » diff » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » ERP CRM Financial » sakai » org.apache.commons.jrcs.diff 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


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.diff;
059:
060:        import java.util.List;
061:
062:        /**
063:         * Holds a "delta" difference between to revisions of a text.
064:         * 
065:         * @version $Revision: 15101 $ $Date: 2006-04-12 18:30:19 +0100 (Wed, 12 Apr
066:         *          2006) $
067:         * @author <a href="mailto:juanco@suigeneris.org">Juanco Anez</a>
068:         * @author <a href="mailto:bwm@hplb.hpl.hp.com">Brian McBride</a>
069:         * @see Diff
070:         * @see Chunk
071:         * @see Revision modifications 27 Apr 2003 bwm Added getOriginal() and
072:         *      getRevised() accessor methods Added visitor pattern accept() method
073:         */
074:
075:        public abstract class Delta extends
076:                org.apache.commons.jrcs.util.ToString {
077:
078:            protected Chunk original;
079:
080:            protected Chunk revised;
081:
082:            static Class[][] DeltaClass;
083:
084:            static {
085:                DeltaClass = new Class[2][2];
086:                DeltaClass[0][0] = org.apache.commons.jrcs.diff.ChangeDelta.class;
087:                DeltaClass[0][1] = org.apache.commons.jrcs.diff.AddDelta.class;
088:                DeltaClass[1][0] = org.apache.commons.jrcs.diff.DeleteDelta.class;
089:                DeltaClass[1][1] = org.apache.commons.jrcs.diff.ChangeDelta.class;
090:            }
091:
092:            /**
093:             * Returns a Delta that corresponds to the given chunks in the original and
094:             * revised text respectively.
095:             * 
096:             * @param orig
097:             *        the chunk in the original text.
098:             * @param rev
099:             *        the chunk in the revised text.
100:             */
101:            public static Delta newDelta(Chunk orig, Chunk rev) {
102:                Class c = DeltaClass[orig.size() > 0 ? 1 : 0][rev.size() > 0 ? 1
103:                        : 0];
104:                Delta result;
105:                try {
106:                    result = (Delta) c.newInstance();
107:                } catch (InstantiationException e) {
108:                    return null;
109:                } catch (IllegalAccessException e) {
110:                    return null;
111:                }
112:                result.init(orig, rev);
113:                return result;
114:            }
115:
116:            /**
117:             * Creates an uninitialized delta.
118:             */
119:            protected Delta() {
120:                // default constructor
121:            }
122:
123:            /**
124:             * Creates a delta object with the given chunks from the original and
125:             * revised texts.
126:             */
127:            protected Delta(Chunk orig, Chunk rev) {
128:                init(orig, rev);
129:            }
130:
131:            /**
132:             * Initializaes the delta with the given chunks from the original and
133:             * revised texts.
134:             */
135:            protected void init(Chunk orig, Chunk rev) {
136:                original = orig;
137:                revised = rev;
138:            }
139:
140:            /**
141:             * Verifies that this delta can be used to patch the given text.
142:             * 
143:             * @param target
144:             *        the text to patch.
145:             * @throws PatchFailedException
146:             *         if the patch cannot be applied.
147:             */
148:            public abstract void verify(List target)
149:                    throws PatchFailedException;
150:
151:            /**
152:             * Applies this delta as a patch to the given text.
153:             * 
154:             * @param target
155:             *        the text to patch.
156:             * @throws PatchFailedException
157:             *         if the patch cannot be applied.
158:             */
159:            public final void patch(List target) throws PatchFailedException {
160:                verify(target);
161:                try {
162:                    applyTo(target);
163:                } catch (Exception e) {
164:                    throw new PatchFailedException(e.getMessage(), e);
165:                }
166:            }
167:
168:            /**
169:             * Applies this delta as a patch to the given text.
170:             * 
171:             * @param target
172:             *        the text to patch.
173:             * @throws PatchFailedException
174:             *         if the patch cannot be applied.
175:             */
176:            public abstract void applyTo(List target);
177:
178:            /**
179:             * Converts this delta into its Unix diff style string representation.
180:             * 
181:             * @param s
182:             *        a {@link StringBuffer StringBuffer} to which the string
183:             *        representation will be appended.
184:             */
185:            public void toString(StringBuffer s) {
186:                original.rangeString(s);
187:                s.append("x");
188:                revised.rangeString(s);
189:                s.append(Diff.NL);
190:                original.toString(s, "> ", "\n");
191:                s.append("---");
192:                s.append(Diff.NL);
193:                revised.toString(s, "< ", "\n");
194:            }
195:
196:            /**
197:             * Converts this delta into its RCS style string representation.
198:             * 
199:             * @param s
200:             *        a {@link StringBuffer StringBuffer} to which the string
201:             *        representation will be appended.
202:             * @param EOL
203:             *        the string to use as line separator.
204:             */
205:            public abstract void toRCSString(StringBuffer s, String EOL);
206:
207:            /**
208:             * Converts this delta into its RCS style string representation.
209:             * 
210:             * @param EOL
211:             *        the string to use as line separator.
212:             */
213:            public String toRCSString(String EOL) {
214:                StringBuffer s = new StringBuffer();
215:                toRCSString(s, EOL);
216:                return s.toString();
217:            }
218:
219:            /**
220:             * Accessor method to return the chunk representing the original sequence of
221:             * items
222:             * 
223:             * @return the original sequence
224:             */
225:            public Chunk getOriginal() {
226:                return original;
227:            }
228:
229:            /**
230:             * Accessor method to return the chunk representing the updated sequence of
231:             * items.
232:             * 
233:             * @return the updated sequence
234:             */
235:            public Chunk getRevised() {
236:                return revised;
237:            }
238:
239:            /**
240:             * Accepts a visitor.
241:             * <p>
242:             * See the Visitor pattern in "Design Patterns" by the GOF4.
243:             * 
244:             * @param visitor
245:             *        The visitor.
246:             */
247:            public abstract void accept(RevisionVisitor visitor);
248:        }
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