Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright 2004-2014 the Seasar Foundation and the Others.
 *
 * Licensed 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.util.ArrayList;

import java.util.List;

public class Main {
    public static <ELEMENT> List<ELEMENT> moveElementToIndex(List<ELEMENT> list, ELEMENT fromElement,
            ELEMENT toElement) {
        assertObjectNotNull("list", list);
        final int fromIndex = list.indexOf(fromElement);
        final int toIndex = list.indexOf(toElement);
        return moveElementToIndex(list, fromIndex, toIndex);
    }

    public static <ELEMENT> List<ELEMENT> moveElementToIndex(List<ELEMENT> list, int fromIndex, int toIndex) {
        assertObjectNotNull("list", list);
        if (fromIndex == toIndex) {
            String msg = "The argument 'fromIndex' and 'toIndex' should not be same:";
            msg = msg + " fromIndex=" + fromIndex + " toIndex" + toIndex;
            throw new IllegalArgumentException(msg);
        }
        if (fromIndex < 0 || toIndex < 0) {
            String msg = "The argument 'fromIndex' and 'toIndex' should not be minus:";
            msg = msg + " fromIndex=" + fromIndex + " toIndex" + toIndex;
            throw new IllegalArgumentException(msg);
        }
        final boolean fromLess = fromIndex < toIndex;
        final List<ELEMENT> movedList = new ArrayList<ELEMENT>();
        final int firstIndex = fromLess ? fromIndex : toIndex;
        final int secondIndex = !fromLess ? fromIndex : toIndex;
        final List<ELEMENT> first = list.subList(0, firstIndex);
        final ELEMENT element = list.get(fromIndex);
        final int adjustmentIndex = fromLess ? 1 : 0;
        final List<ELEMENT> middle = list.subList(firstIndex + adjustmentIndex, secondIndex + adjustmentIndex);
        final List<ELEMENT> last = list.subList(secondIndex + 1, list.size());
        movedList.addAll(first);
        if (!fromLess) {
            movedList.add(element);
        }
        movedList.addAll(middle);
        if (fromLess) {
            movedList.add(element);
        }
        movedList.addAll(last);
        return movedList;
    }

    protected static void assertObjectNotNull(String variableName, Object value) {
        if (variableName == null) {
            String msg = "The value should not be null: variableName=null value=" + value;
            throw new IllegalArgumentException(msg);
        }
        if (value == null) {
            String msg = "The value should not be null: variableName=" + variableName;
            throw new IllegalArgumentException(msg);
        }
    }
}