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1   /**
2    * Copyright 2005-2014 The Kuali Foundation
3    *
4    * Licensed under the Educational Community License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    * http://www.opensource.org/licenses/ecl2.php
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package org.kuali.rice.krms.framework.engine;
17  
18  import java.util.Collection;
19  
20  import org.kuali.rice.krms.api.engine.ExecutionEnvironment;
21  import org.kuali.rice.krms.api.engine.ResultEvent;
22  import org.kuali.rice.krms.api.engine.Term;
23  import org.kuali.rice.krms.api.engine.TermResolutionException;
24  import org.kuali.rice.krms.framework.engine.expression.ComparisonOperator;
25  import org.kuali.rice.krms.framework.engine.result.BasicResult;
26  
27  public class CollectionOfComparablesTermBasedProposition<T> extends ComparableTermBasedProposition<T> {
28  	private static final ResultLogger LOG = ResultLogger.getInstance();
29  
30  	private CollectionOperator collectionOper;
31  	private Term term;
32  
33  	public CollectionOfComparablesTermBasedProposition(CollectionOperator collectionOper, ComparisonOperator compareOper, Term term, T expectedValue) {
34  		super(compareOper, term, expectedValue);
35  		this.term = term;
36  		this.collectionOper = collectionOper;
37  	}
38  
39  	/**
40  	 * @see org.kuali.rice.krms.framework.engine.ComparableTermBasedProposition#evaluate(org.kuali.rice.krms.api.engine.ExecutionEnvironment)
41  	 * @throws TermResolutionException if there is a problem resolving a {@link Term}
42  	 */
43  	@Override
44  	public PropositionResult evaluate(ExecutionEnvironment environment) {
45  		boolean collatedResult = collectionOper.getInitialCollatedResult();
46  
47  		Collection<? extends Comparable<T>> termValue;
48  
49  		termValue = environment.resolveTerm(term, this);
50  
51  		if (termValue != null) {
52  			for (Comparable<T> item : termValue) {
53  				collatedResult = collectionOper.reduce(compare(item), collatedResult);
54  				if (collectionOper.shortCircuit(collatedResult)) break;
55  			}
56  		}
57  
58  		// TODO: log this appropriately
59  		if (LOG.isEnabled(environment)) {
60  			LOG.logResult(new BasicResult(ResultEvent.PROPOSITION_EVALUATED, this, environment, collatedResult));
61  		}
62  
63  		return new PropositionResult(collatedResult);
64  	}
65  
66  	public String toString() {
67  		StringBuilder sb = new StringBuilder();
68  		sb.append(collectionOper.toString());
69  		sb.append(" "+super.toString());
70  		return sb.toString();
71  	}
72  }