001: /*
002: * ====================================================================
003: * JAFFA - Java Application Framework For All
004: *
005: * Copyright (C) 2002 JAFFA Development Group
006: *
007: * This library is free software; you can redistribute it and/or
008: * modify it under the terms of the GNU Lesser General Public
009: * License as published by the Free Software Foundation; either
010: * version 2.1 of the License, or (at your option) any later version.
011: *
012: * This library is distributed in the hope that it will be useful,
013: * but WITHOUT ANY WARRANTY; without even the implied warranty of
014: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
015: * Lesser General Public License for more details.
016: *
017: * You should have received a copy of the GNU Lesser General Public
018: * License along with this library; if not, write to the Free Software
019: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
020: *
021: * Redistribution and use of this software and associated documentation ("Software"),
022: * with or without modification, are permitted provided that the following conditions are met:
023: * 1. Redistributions of source code must retain copyright statements and notices.
024: * Redistributions must also contain a copy of this document.
025: * 2. Redistributions in binary form must reproduce the above copyright notice,
026: * this list of conditions and the following disclaimer in the documentation
027: * and/or other materials provided with the distribution.
028: * 3. The name "JAFFA" must not be used to endorse or promote products derived from
029: * this Software without prior written permission. For written permission,
030: * please contact mail to: jaffagroup@yahoo.com.
031: * 4. Products derived from this Software may not be called "JAFFA" nor may "JAFFA"
032: * appear in their names without prior written permission.
033: * 5. Due credit should be given to the JAFFA Project (http://jaffa.sourceforge.net).
034: *
035: * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED
036: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
037: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
038: * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
039: * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
040: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
041: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
042: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
043: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
044: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
045: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
046: * SUCH DAMAGE.
047: * ====================================================================
048: */
049:
050: package org.jaffa.tools.patternengine;
051:
052: import java.io.*;
053: import java.util.*;
054: import org.jaffa.tools.common.SourceDecomposer;
055: import org.jaffa.tools.common.SourceDecomposerException;
056:
057: /** This class is used for merging an existing file with a new code generated file.
058: * It will merge the GuardedBorder contents (i.e the custom code) of the existing file into the new file.
059: */
060: public class SourceMerge {
061:
062: /** Merges the existing File into the new code generated file returning the contents as a String
063: * @param newTemplate the new code generated file.
064: * @param existingFile the existing file.
065: * @throws IOException if any IO error occurs.
066: * @throws SourceDecomposerException if the file is malformed or if it cannot be decomposed.
067: * @return the merged contents.
068: */
069: public static String performMerge(BufferedReader newTemplate,
070: BufferedReader existingFile) throws IOException,
071: SourceDecomposerException {
072: StringBuffer buf = new StringBuffer();
073: SourceDecomposer sdNew = new SourceDecomposer(newTemplate);
074: SourceDecomposer sdExisting = new SourceDecomposer(existingFile);
075: Collection elements = sdNew.getCollection();
076: if (elements != null) {
077: for (Iterator itr = elements.iterator(); itr.hasNext();) {
078: Object obj = itr.next();
079: if (obj instanceof SourceDecomposer.PlainText) {
080: buf.append(((SourceDecomposer.PlainText) obj)
081: .getContents());
082: } else if (obj instanceof SourceDecomposer.GuardedBlock) {
083: buf.append(((SourceDecomposer.GuardedBlock) obj)
084: .getContents());
085: } else if (obj instanceof SourceDecomposer.GuardedBorder) {
086: SourceDecomposer.GuardedBorder newGB = (SourceDecomposer.GuardedBorder) obj;
087:
088: // check if the existing file has this piece of code
089: SourceDecomposer.GuardedBorder existingGB = sdExisting
090: .getGuardedBorder(newGB.getKey());
091:
092: if (existingGB != null)
093: buf.append(existingGB.getContents());
094: else
095: buf.append(newGB.getContents());
096: } else {
097: // do nothing
098: }
099:
100: }
101: }
102: return buf.toString();
103: }
104:
105: }
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