001: /*
002: The contents of this file are subject to the Common Public Attribution License
003: Version 1.0 (the "License"); you may not use this file except in compliance with
004: the License. You may obtain a copy of the License at
005: http://www.projity.com/license . The License is based on the Mozilla Public
006: License Version 1.1 but Sections 14 and 15 have been added to cover use of
007: software over a computer network and provide for limited attribution for the
008: Original Developer. In addition, Exhibit A has been modified to be consistent
009: with Exhibit B.
010:
011: Software distributed under the License is distributed on an "AS IS" basis,
012: WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the
013: specific language governing rights and limitations under the License. The
014: Original Code is OpenProj. The Original Developer is the Initial Developer and
015: is Projity, Inc. All portions of the code written by Projity are Copyright (c)
016: 2006, 2007. All Rights Reserved. Contributors Projity, Inc.
017:
018: Alternatively, the contents of this file may be used under the terms of the
019: Projity End-User License Agreeement (the Projity License), in which case the
020: provisions of the Projity License are applicable instead of those above. If you
021: wish to allow use of your version of this file only under the terms of the
022: Projity License and not to allow others to use your version of this file under
023: the CPAL, indicate your decision by deleting the provisions above and replace
024: them with the notice and other provisions required by the Projity License. If
025: you do not delete the provisions above, a recipient may use your version of this
026: file under either the CPAL or the Projity License.
027:
028: [NOTE: The text of this license may differ slightly from the text of the notices
029: in Exhibits A and B of the license at http://www.projity.com/license. You should
030: use the latest text at http://www.projity.com/license for your modifications.
031: You may not remove this license text from the source files.]
032:
033: Attribution Information: Attribution Copyright Notice: Copyright © 2006, 2007
034: Projity, Inc. Attribution Phrase (not exceeding 10 words): Powered by OpenProj,
035: an open source solution from Projity. Attribution URL: http://www.projity.com
036: Graphic Image as provided in the Covered Code as file: openproj_logo.png with
037: alternatives listed on http://www.projity.com/logo
038:
039: Display of Attribution Information is required in Larger Works which are defined
040: in the CPAL as a work which combines Covered Code or portions thereof with code
041: not governed by the terms of the CPAL. However, in addition to the other notice
042: obligations, all copies of the Covered Code in Executable and Source Code form
043: distributed must, as a form of attribution of the original author, include on
044: each user interface screen the "OpenProj" logo visible to all users. The
045: OpenProj logo should be located horizontally aligned with the menu bar and left
046: justified on the top left of the screen adjacent to the File menu. The logo
047: must be at least 100 x 25 pixels. When users click on the "OpenProj" logo it
048: must direct them back to http://www.projity.com.
049: */
050: package com.projity.algorithm;
051:
052: import java.util.Collection;
053: import java.util.Iterator;
054: import java.util.LinkedList;
055: import java.util.List;
056:
057: import com.projity.pm.time.HasStartAndEnd;
058:
059: /**
060: * An abstract class for an interval generator that wraps a collection.
061: */
062: public class CollectionIntervalGenerator implements IntervalGenerator,
063: HasStartAndEnd {
064: protected Collection collection;
065: Object current = null;
066: protected boolean finished = false;
067: long start = 0;
068: boolean active = false;
069: Iterator iterator;
070:
071: /**
072: *
073: */
074: protected CollectionIntervalGenerator(Collection collection) {
075: this .collection = collection;
076: initialize();
077: }
078:
079: public static CollectionIntervalGenerator getInstance(
080: Collection collection) {
081: return new CollectionIntervalGenerator(collection);
082: }
083:
084: public static CollectionIntervalGenerator getInstance(
085: HasStartAndEnd interval) {
086: LinkedList list = new LinkedList();
087: list.add(interval);
088: return getInstance(list);
089: }
090:
091: protected Iterator makeIterator() {
092: if (collection instanceof List)
093: return ((List) collection).listIterator();
094: else
095: return iterator;
096: }
097:
098: protected void initialize() {
099: iterator = makeIterator();
100: if (iterator.hasNext()) {
101: current = iterator.next();
102: updateActiveState();
103: }
104:
105: }
106:
107: private void updateActiveState() {
108: active = ((HasStartAndEnd) current).getStart() == start;
109: }
110:
111: /* (non-Javadoc)
112: * @see com.projity.algorithm.IntervalGenerator#current()
113: */
114: public Object current() {
115: if (active)
116: return current;
117: else
118: return this ;
119: }
120:
121: /* (non-Javadoc)
122: * @see com.projity.algorithm.IntervalGenerator#next()
123: */
124: public boolean evaluate(Object obj) {
125: start = currentEnd(); // move start ahead
126: if (active) { // active implies that the value comes from the collection
127: if (!iterator.hasNext()) {
128: current = null;
129: finished = true;
130: active = false;
131: return false;
132: }
133: current = iterator.next();
134: }
135: // start = currentEnd(); // move start ahead
136: updateActiveState(); // will set to active if the current item in collecition starts at start
137: return true;
138: }
139:
140: /* (non-Javadoc)
141: * @see java.lang.Comparable#compareTo(java.lang.Object)
142: */
143: public int compareTo(Object arg0) {
144: // TODO Auto-generated method stub
145: return 0;
146: }
147:
148: /* (non-Javadoc)
149: * @see com.projity.algorithm.IntervalGenerator#hasNext()
150: */
151: public boolean hasNext() {
152: return iterator.hasNext();
153: }
154:
155: public boolean isCurrentActive() {
156: return active;
157: }
158:
159: /* (non-Javadoc)
160: * @see com.projity.algorithm.IntervalGenerator#currentEnd()
161: */
162: public long currentEnd() {
163: long curEnd = (current == null) ? Long.MAX_VALUE
164: : ((HasStartAndEnd) current).getEnd();
165:
166: if (curEnd == 1)
167: System.out.println(" 1 cur end");
168: return active ? curEnd : ((HasStartAndEnd) current).getStart();
169: }
170:
171: /* (non-Javadoc)
172: * @see com.projity.algorithm.IntervalGenerator#currentStart()
173: */
174: public long currentStart() {
175: return start;
176: // return (current == null) ? lastEnd : ((HasStartAndEnd)current).getStart();
177: }
178:
179: /**
180: * @return Returns the finished.
181: */
182: public boolean isFinished() {
183: return finished;
184: }
185:
186: /* (non-Javadoc)
187: * @see com.projity.pm.time.HasStartAndEnd#getEnd()
188: */
189: public long getEnd() {
190: return currentEnd();
191: }
192:
193: /* (non-Javadoc)
194: * @see com.projity.pm.time.HasStartAndEnd#getStart()
195: */
196: public long getStart() {
197: return currentStart();
198: }
199:
200: public boolean canBeShared() {
201: return true;
202: }
203: }
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