001// *************************************************************************************************************************** 002// * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file * 003// * distributed with this work for additional information regarding copyright ownership. The ASF licenses this file * 004// * to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance * 005// * with the License. You may obtain a copy of the License at * 006// * * 007// * http://www.apache.org/licenses/LICENSE-2.0 * 008// * * 009// * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an * 010// * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the * 011// * specific language governing permissions and limitations under the License. * 012// *************************************************************************************************************************** 013package org.apache.juneau.pojotools; 014 015import java.lang.reflect.*; 016import java.util.*; 017 018import org.apache.juneau.*; 019import org.apache.juneau.internal.*; 020 021/** 022 * Designed to provide paging on POJOs consisting of arrays and collections. 023 * 024 * <p> 025 * Allows you to quickly return subsets of arrays and collections based on position/limit arguments. 026 */ 027@SuppressWarnings({"unchecked","rawtypes"}) 028public final class PojoViewer implements PojoTool<ViewArgs> { 029 030 @Override /* PojoTool */ 031 public Object run(BeanSession session, Object input, ViewArgs args) { 032 033 if (input == null) 034 return null; 035 036 List<String> view = args.getView(); 037 ClassMeta type = session.getClassMetaForObject(input); 038 039 if (type.isBeanMap()) 040 return new DelegateBeanMap(((BeanMap)input).getBean(), session).filterKeys(view); 041 if (type.isMap()) 042 return new DelegateMap((Map)input, session).filterKeys(view); 043 if (type.isBean()) 044 return new DelegateBeanMap(input, session).filterKeys(view); 045 046 ArrayList<Object> l = null; 047 048 if (type.isArray()) { 049 int size = Array.getLength(input); 050 l = new ArrayList<>(size); 051 for (int i = 0; i < size; i++) 052 l.add(Array.get(input, i)); 053 } else if (type.isCollection()) { 054 Collection c = (Collection)input; 055 l = new ArrayList<>(c.size()); 056 for (Object o : c) 057 l.add(o); 058 } else { 059 return input; 060 } 061 062 for (ListIterator li = l.listIterator(); li.hasNext();) { 063 Object o = li.next(); 064 ClassMeta cm2 = session.getClassMetaForObject(o); 065 066 if (cm2 == null) 067 o = null; 068 else if (cm2.isBeanMap()) 069 o = new DelegateBeanMap(((BeanMap)o).getBean(), session).filterKeys(view); 070 else if (cm2.isMap()) 071 o = new DelegateMap((Map)o, session).filterKeys(view); 072 else if (cm2.isBean()) 073 o = new DelegateBeanMap(o, session).filterKeys(view); 074 075 li.set(o); 076 } 077 078 return l; 079 } 080}