001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 package org.apache.commons.betwixt.strategy; 018 019 import java.util.Collection; 020 import java.util.Enumeration; 021 import java.util.Iterator; 022 import java.util.Map; 023 024 /** 025 * Specifies which types should be regarded as collective 026 * @since 0.8 027 */ 028 public abstract class CollectiveTypeStrategy { 029 030 /** 031 * Default collective type strategy 032 */ 033 public static final CollectiveTypeStrategy DEFAULT = new Default(); 034 035 /** 036 * Is this a loop type class? 037 * @since 0.7 038 * @param type is this <code>Class</code> a loop type? 039 * @return true if the type is a loop type, or if type is null 040 */ 041 public abstract boolean isCollective(Class type); 042 043 /** 044 * Default collective type strategy 045 */ 046 public static class Default extends CollectiveTypeStrategy { 047 048 /** 049 * Basic implementation returns true for all the standard java 050 * collective types and their subclasses. 051 */ 052 public boolean isCollective(Class type) { 053 // consider: should this be factored into a pluggable strategy? 054 // check for NPEs 055 if (type == null) { 056 return false; 057 } 058 return type.isArray() 059 || Map.class.isAssignableFrom( type ) 060 || Collection.class.isAssignableFrom( type ) 061 || Enumeration.class.isAssignableFrom( type ) 062 || Iterator.class.isAssignableFrom( type ) 063 || Map.Entry.class.isAssignableFrom( type ) ; 064 065 } 066 067 } 068 }