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// * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file * | |
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// * to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance * | |
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// * * | |
// * http://www.apache.org/licenses/LICENSE-2.0 * | |
// * * | |
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// *************************************************************************************************************************** | |
package org.apache.juneau.pojotools; | |
import java.lang.reflect.*; | |
import java.util.*; | |
import org.apache.juneau.*; | |
import org.apache.juneau.internal.*; | |
/** | |
* Designed to provide paging on POJOs consisting of arrays and collections. | |
* | |
* <p> | |
* Allows you to quickly return subsets of arrays and collections based on position/limit arguments. | |
*/ | |
@SuppressWarnings({"unchecked","rawtypes"}) | |
public final class PojoViewer implements PojoTool<ViewArgs> { | |
@Override /* PojoTool */ | |
public Object run(BeanSession session, Object input, ViewArgs args) { | |
if (input == null) | |
return null; | |
List<String> view = args.getView(); | |
ClassMeta type = session.getClassMetaForObject(input); | |
if (type.isBeanMap()) | |
return new DelegateBeanMap(((BeanMap)input).getBean(), session).filterKeys(view); | |
if (type.isMap()) | |
return new DelegateMap((Map)input, session).filterKeys(view); | |
if (type.isBean()) | |
return new DelegateBeanMap(input, session).filterKeys(view); | |
ArrayList<Object> l = null; | |
if (type.isArray()) { | |
int size = Array.getLength(input); | |
l = new ArrayList<>(size); | |
for (int i = 0; i < size; i++) | |
l.add(Array.get(input, i)); | |
} else if (type.isCollection()) { | |
Collection c = (Collection)input; | |
l = new ArrayList<>(c.size()); | |
for (Object o : c) | |
l.add(o); | |
} else { | |
return input; | |
} | |
for (ListIterator li = l.listIterator(); li.hasNext();) { | |
Object o = li.next(); | |
ClassMeta cm2 = session.getClassMetaForObject(o); | |
if (cm2 == null) | |
o = null; | |
else if (cm2.isBeanMap()) | |
o = new DelegateBeanMap(((BeanMap)o).getBean(), session).filterKeys(view); | |
else if (cm2.isMap()) | |
o = new DelegateMap((Map)o, session).filterKeys(view); | |
else if (cm2.isBean()) | |
o = new DelegateBeanMap(o, session).filterKeys(view); | |
li.set(o); | |
} | |
return l; | |
} | |
} |