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Struts example source code file (MakeIterator.java)
The Struts MakeIterator.java source code/* * $Id: MakeIterator.java 721947 2008-12-01 02:25:47Z wesw $ * * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. */ package org.apache.struts2.util; import java.lang.reflect.Array; import java.util.ArrayList; import java.util.Collection; import java.util.Enumeration; import java.util.Iterator; import java.util.List; import java.util.Map; /** * MakeIterator. * */ public class MakeIterator { /** * Determine whether a given object can be made into an <code>Iterator * * @param object the object to check * @return <code>true if the object can be converted to an iterator and * <code>false otherwise */ public static boolean isIterable(Object object) { if (object == null) { return false; } if (object instanceof Map) { return true; } else if (object instanceof Iterable) { return true; } else if (object.getClass().isArray()) { return true; } else if (object instanceof Enumeration) { return true; } else if (object instanceof Iterator) { return true; } else { return false; } } public static Iterator convert(Object value) { Iterator iterator; if (value instanceof Iterator) { return (Iterator) value; } if (value instanceof Map) { value = ((Map) value).entrySet(); } if (value == null) { return null; } if (value instanceof Iterable) { iterator = ((Iterable) value).iterator(); } else if (value.getClass().isArray()) { //need ability to support primitives; therefore, cannot //use Object[] casting. ArrayList list = new ArrayList(Array.getLength(value)); for (int j = 0; j < Array.getLength(value); j++) { list.add(Array.get(value, j)); } iterator = list.iterator(); } else if (value instanceof Enumeration) { Enumeration enumeration = (Enumeration) value; ArrayList list = new ArrayList(); while (enumeration.hasMoreElements()) { list.add(enumeration.nextElement()); } iterator = list.iterator(); } else { List list = new ArrayList(1); list.add(value); iterator = list.iterator(); } return iterator; } } Other Struts examples (source code examples)Here is a short list of links related to this Struts MakeIterator.java source code file: |
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