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/*
 *
 *  *  Copyright 2010-2016 OrientDB LTD (http://orientdb.com)
 *  *
 *  *  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.
 *  *
 *  * For more information: http://orientdb.com
 *
 */
package com.orientechnologies.orient.core.type;

import com.orientechnologies.common.io.OIOUtils;
import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;

public class OBuffer implements Externalizable {
  public byte[] buffer;

  /** Constructor used by serialization. */
  public OBuffer() {}

  public OBuffer(final byte[] buffer) {
    this.buffer = buffer;
  }

  public void readExternal(final ObjectInput iInput) throws IOException, ClassNotFoundException {
    final int bufferLength = iInput.readInt();
    if (bufferLength > 0) {
      buffer = new byte[bufferLength];
      for (int pos = 0, bytesReaded = 0; pos < bufferLength; pos += bytesReaded) {
        bytesReaded = iInput.read(buffer, pos, buffer.length - pos);
      }
    } else buffer = null;
  }

  public void writeExternal(final ObjectOutput iOutput) throws IOException {
    final int bufferLength = buffer != null ? buffer.length : 0;
    iOutput.writeInt(bufferLength);
    if (bufferLength > 0) iOutput.write(buffer);
  }

  @Override
  public String toString() {
    return "size:" + (buffer != null ? buffer.length : "empty");
  }

  public byte[] getBuffer() {
    return buffer;
  }

  public void setBuffer(final byte[] buffer) {
    this.buffer = buffer;
  }

  @Override
  public boolean equals(final Object o) {
    if (o == null || !(o instanceof OBuffer)) return false;

    return OIOUtils.equals(buffer, ((OBuffer) o).buffer);
  }

  @Override
  public int hashCode() {
    // Use of reference hashCode. Usage of deep hashCode should be considered
    return buffer != null ? java.util.Arrays.hashCode(buffer) : 0;
  }
}