Main.java Source code

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Here is the source code for Main.java

Source

//package com.java2s;
/**
 * 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.
 */

import java.lang.reflect.Array;

import java.util.Collection;

import java.util.Map;

import org.w3c.dom.NodeList;

public class Main {
    /**
     * Returns the size of the collection if it can be determined to be a collection
     *
     * @param value the collection
     * @return the size, or <tt>null</tt> if not a collection
     */
    public static Integer size(Object value) {
        if (value != null) {
            if (value instanceof Collection) {
                Collection<?> collection = (Collection<?>) value;
                return collection.size();
            } else if (value instanceof Map) {
                Map<?, ?> map = (Map<?, ?>) value;
                return map.size();
            } else if (value instanceof Object[]) {
                Object[] array = (Object[]) value;
                return array.length;
            } else if (value.getClass().isArray()) {
                return Array.getLength(value);
            } else if (value instanceof NodeList) {
                NodeList nodeList = (NodeList) value;
                return nodeList.getLength();
            }
        }
        return null;
    }
}