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'rapiddweller Common' is an open source Java library forked from Databene Commons by Volker Bergmann. It provides extensions to the Java core library by utility classes, abstract concepts and concrete implementations.

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/*
 * Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * 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 com.rapiddweller.common.array;

import com.rapiddweller.common.converter.ToStringConverter;

/**
 * Helper class for constructing byte arrays.
 * Created: 27.12.2010 07:45:22
 *
 * @author Volker Bergmann
 * @since 0.5.5
 */
public class ByteArrayBuilder extends AbstractByteArray {

  // constructors ------------------------------------------------------------

  /**
   * Instantiates a new Byte array builder.
   */
  public ByteArrayBuilder() {
    super();
  }

  /**
   * Instantiates a new Byte array builder.
   *
   * @param initialCapacity the initial capacity
   */
  public ByteArrayBuilder(int initialCapacity) {
    super(initialCapacity);
  }

  // interface ---------------------------------------------------------------

  @Override
  public ByteArrayBuilder add(byte item) {
    if (this.buffer == null) {
      throw new UnsupportedOperationException("ArrayBuilder cannot be reused after invoking toArray()");
    }
    super.add(item);
    return this;
  }

  /**
   * To array byte [ ].
   *
   * @return the byte [ ]
   */
  public byte[] toArray() {
    if (this.buffer == null) {
      throw new UnsupportedOperationException("ArrayBuilder cannot be reused after invoking toArray()");
    }
    byte[] result = new byte[this.itemCount];
    System.arraycopy(buffer, 0, result, 0, this.itemCount);
    this.itemCount = 0;
    buffer = null;
    return result;
  }

  @Override
  public String toString() {
    StringBuilder builder = new StringBuilder();
    for (int i = 0; i < itemCount; i++) {
      if (i > 0) {
        builder.append(", ");
      }
      builder.append(ToStringConverter.convert(buffer[i], "[NULL]"));
    }
    return builder.toString();
  }

}