00001 /* 00002 * ComparableMin.hpp 00003 * 00004 * Copyright (c) 2000, 2009, Oracle and/or its affiliates. All rights reserved. 00005 * 00006 * Oracle is a registered trademarks of Oracle Corporation and/or its 00007 * affiliates. 00008 * 00009 * This software is the confidential and proprietary information of Oracle 00010 * Corporation. You shall not disclose such confidential and proprietary 00011 * information and shall use it only in accordance with the terms of the 00012 * license agreement you entered into with Oracle. 00013 * 00014 * This notice may not be removed or altered. 00015 */ 00016 #ifndef COH_COMPARABLE_MIN_HPP 00017 #define COH_COMPARABLE_MIN_HPP 00018 00019 #include "coherence/lang.ns" 00020 00021 #include "coherence/util/aggregator/AbstractComparableAggregator.hpp" 00022 #include "coherence/util/ValueExtractor.hpp" 00023 00024 COH_OPEN_NAMESPACE3(coherence,util,aggregator) 00025 00026 00027 /** 00028 * Calculates a minimum among values extracted from a set of entries in a Map. 00029 * This aggregator is most commonly used with objects that implement 00030 * <tt>Comparable</tt> such as <tt>String<tt/>; a <tt>Comparator</tt> can also 00031 * be supplied to perform the comparisons. 00032 * 00033 * @author djl/pp 2008.05.09 00034 */ 00035 class COH_EXPORT ComparableMin 00036 : public class_spec<ComparableMin, 00037 extends<AbstractComparableAggregator> > 00038 { 00039 friend class factory<ComparableMin>; 00040 00041 // ----- constructors --------------------------------------------------- 00042 00043 protected: 00044 /** 00045 * Default constructor (necessary for the PortableObject interface). 00046 */ 00047 ComparableMin(); 00048 00049 /** 00050 * Construct a ComparableMin aggregator. 00051 * 00052 * @param vExtractor the extractor that provides an object to be compared 00053 * @param vComparator the comparator used to compare the extracted 00054 * object, if NULL then the extracted object must 00055 * implement Comparable 00056 */ 00057 ComparableMin(ValueExtractor::View vExtractor, 00058 Comparator::View vComparator = NULL); 00059 00060 00061 // ----- AbstractAggregator Interface ---------------------------------- 00062 00063 protected: 00064 /** 00065 * {@inheritDoc} 00066 */ 00067 virtual void process(Object::View v, bool fFinal); 00068 }; 00069 00070 COH_CLOSE_NAMESPACE3 00071 00072 #endif // COH_COMPARABLE_MIN_HPP