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.Iterator;
053: import java.util.LinkedList;
054:
055: import org.apache.commons.collections.Closure;
056: import org.apache.commons.collections.Factory;
057:
058: import com.projity.pm.time.HasStartAndEnd;
059:
060: /**
061: * This class applies an action visitor closure over an interval and select clauses
062: */
063: public class Query implements Factory, HasStartAndEnd {
064: long start;
065: long end;
066: boolean hasGroupBy = false;
067:
068: private LinkedList selectFromClauses = new LinkedList();
069: private IntervalGenerator groupByGenerator = null;
070: private Closure actionVisitor = null;
071:
072: /**
073: * The constructor is empty. The query is built by chaining together parts of statement
074: */
075: private Query() {
076: }
077:
078: public static Query getInstance() {
079: return new Query();
080: }
081:
082: public Query selectFrom(SelectFrom selectFrom) {
083: selectFromClauses.add(selectFrom);
084: return this ;
085: }
086:
087: public Query selectFrom(LinkedList selectFromClauses) {
088: this .selectFromClauses = selectFromClauses;
089: return this ;
090: }
091:
092: public Query groupBy(IntervalGenerator groupByGenerator) {
093: if (groupByGenerator == null)
094: return this ;
095: hasGroupBy = true;
096: this .groupByGenerator = groupByGenerator;
097: return this ;
098: }
099:
100: public Query action(Closure actionVisitor) {
101: this .actionVisitor = actionVisitor;
102: return this ;
103: }
104:
105: public IntervalGenerator[] execute() {
106: if (groupByGenerator == null)
107: groupByGenerator = RangeIntervalGenerator.continuous();
108: create();
109: return null; //TODO return array of intervalgenerators
110: }
111:
112: /**
113: * This is the main calculation function. It will go thru all elements of the group by generator (if any) and
114: * call back the action visitor.
115: * Eventually, it will be capable of returning a generator which itself can be used in a subsequent query
116: */
117: public Object create() {
118: SelectFrom clause;
119: do {
120:
121: // set range of this element
122: start = groupByGenerator.currentStart();
123: end = groupByGenerator.currentEnd();
124: // System.out.println("query dates " + new java.util.Date(start) + " - " + new java.util.Date(end));
125: Iterator i = selectFromClauses.iterator();
126: while (i.hasNext()) { // go thru select from clauses until they are used up
127: clause = (SelectFrom) i.next();
128: clause.initializeCalculations();
129: if (!clause.calculate(start, end)) // if clause is used up, remove it so it won't be treated again
130: i.remove();
131: }
132:
133: if (start != 0L && actionVisitor != null)
134: actionVisitor.execute(this );
135:
136: // in case where there is no specified group by, should stop when no more things to treat
137: if (!hasGroupBy && selectFromClauses.isEmpty())
138: break;
139:
140: } while (groupByGenerator.evaluate(this ));
141: return null; //TODO add support for returning a generator
142: }
143:
144: /**
145: * @return Returns the end.
146: */
147: public long getEnd() {
148: return end;
149: }
150:
151: /**
152: * @return Returns the start.
153: */
154: public long getStart() {
155: return start;
156: }
157:
158: /**
159: * @return Returns the groupByGenerator.
160: */
161: public IntervalGenerator getGroupByGenerator() {
162: return groupByGenerator;
163: }
164:
165: public Object currentGroupByObject() {
166: return groupByGenerator.current();
167: }
168:
169: /**
170: * @return Returns the actionVisitor.
171: */
172: public Closure getActionVisitor() {
173: return actionVisitor;
174: }
175:
176: }
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