Main.java Source code

Introduction

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.ArrayList;

import java.util.Collections;
import java.util.Iterator;
import java.util.List;

public class Main {
    /**
     * General purpose list converter method. Will convert arrays, collections,
     * iterables etc. into lists.
     * 
     * If the argument is a single object (such as a String or a POJO) it will
     * be wrapped in a single-element list.
     * 
     * Null will be converted to the empty list.
     * 
     * @param obj
     *            any object
     * @return a list representation of the object
     */
    public static List<?> toList(Object obj) {
        final List<Object> result;
        if (obj == null) {
            result = Collections.emptyList();
        } else if (obj instanceof List) {
            @SuppressWarnings("unchecked")
            List<Object> list = (List<Object>) obj;
            result = list;
        } else if (obj.getClass().isArray()) {
            int length = Array.getLength(obj);
            result = new ArrayList<Object>(length);
            for (int i = 0; i < length; i++) {
                result.add(Array.get(obj, i));
            }
        } else if (obj instanceof Iterable) {
            result = new ArrayList<Object>();
            for (Object item : (Iterable<?>) obj) {
                result.add(item);
            }
        } else if (obj instanceof Iterator) {
            result = new ArrayList<Object>();
            Iterator<?> it = (Iterator<?>) obj;
            while (it.hasNext()) {
                result.add(it.next());
            }
        } else {
            result = new ArrayList<Object>(1);
            result.add(obj);
        }
        return result;
    }
}