Add new value, which sets as the first value, to existing array. : Array Insert Remove « Collections Data Structure « Java

1. Java
2. Collections Data Structure
3. Array Insert Remove

Add new value, which sets as the first value, to existing array.

     
/*
 * Copyright 2008-2009 the T2 Project ant 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.
 */
//package org.t2framework.commons.util;

import java.lang.reflect.Array;

/**
 * ArrayUtil is an utility class for processing array.
 * 
 * @author shot
 */
public class ArrayUtil {

  /**
   * Add new value, which sets as the first value, to existing array.
   * 
   * @param <T>
   * @param current
   * @param value
   * @return
   */
  @SuppressWarnings("unchecked")
  public static <T> T[] addFirst(T[] current, T value) {

    T[] newone = (T[]) Array.newInstance(current.getClass()
        .getComponentType(), current.length + 1);
    copy(current, newone, 0, 1, current.length);
    newone[0] = value;
    return newone;
  }

  /**
   * Copy array with from and to position.
   * 
   * @param <T>
   * @param from
   * @param to
   * @param fromPos
   * @param toPos
   * @param length
   * @return
   */
  public static <T> T[] copy(T[] from, T[] to, int fromPos, int toPos,
      int length) {
    System.arraycopy(from, fromPos, to, toPos, length);
    return to;
  }
}

   
    
    
    
    
  

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