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: /**
053: * A generator which corresponds to an instant in time. It has three periods:
054: * Everything before and up to the instant, the instant itself, and everything after
055: */
056: public class InstantIntervalGenerator implements IntervalGenerator {
057: long start = 0;
058: long end;
059: long instant;
060:
061: public static InstantIntervalGenerator getInstance(long instant) {
062: return new InstantIntervalGenerator(instant);
063: }
064:
065: /**
066: * Constructor
067: * @param instant The instant. Start and end of the active interval are the same
068: */
069: private InstantIntervalGenerator(long instant) {
070: this .instant = instant;
071: start = 0;
072: end = instant;
073: }
074:
075: /* (non-Javadoc)
076: * @see com.projity.algorithm.IntervalGenerator#current()
077: */
078: public Object current() {
079: return null;
080: }
081:
082: /* (non-Javadoc)
083: * @see com.projity.algorithm.IntervalGenerator#currentEnd()
084: */
085: public long currentEnd() {
086: return end;
087: }
088:
089: /* (non-Javadoc)
090: * @see com.projity.algorithm.IntervalGenerator#currentStart()
091: */
092: public long currentStart() {
093: return start;
094: }
095:
096: /* (non-Javadoc)
097: * @see com.projity.algorithm.IntervalGenerator#isCurrentActive()
098: */
099: public boolean isCurrentActive() {
100: return false;
101: }
102:
103: /* (non-Javadoc)
104: * @see com.projity.algorithm.IntervalGenerator#hasNext()
105: */
106: public boolean hasNext() {
107: return start == 0;
108: }
109:
110: /**
111: * Identifies this generator as one that is specific.
112: */
113: public boolean canBeShared() {
114: return false;
115: }
116:
117: /**
118: * Move on to next period.
119: */
120: public boolean evaluate(Object arg0) {
121: if (start == 0) {
122: start = instant;
123: // end is already instant
124: } else if (start == instant) {
125: start = Long.MAX_VALUE;
126: end = Long.MAX_VALUE;
127: } else {
128: return false;
129: }
130: return true;
131: }
132:
133: }
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