CSOperator.java :  » PDF » jPod » de » intarsys » pdf » content » Java Open Source

/*
 * Copyright (c) 2007, intarsys consulting GmbH
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package de.intarsys.pdf.content;

import java.util.Arrays;

/**
 * A class representing an operator of a content stream.
 * 
 * <p>
 * The content stream is a sequence of operations, with any operation beeing a
 * list of operands followed by the operator.
 * </p>
 */
public class CSOperator {
  /**
   * The bytes that name the operator
   */
  private final byte[] token;

  /**
   * A cache for the hash code
   */
  private int hash;

  public CSOperator(byte[] token) {
    this.token = token;
  }

  static public CSOperator create(String name) {
    char[] chars = name.toCharArray();
    byte[] bytes = new byte[chars.length];
    for (int i = 0; i < chars.length; i++) {
      bytes[i] = (byte) chars[i];
    }
    return new CSOperator(bytes);
  }

  public byte[] getToken() {
    return token;
  }

  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }
    if (!(o instanceof CSOperator)) {
      return false;
    }
    return Arrays.equals(token, ((CSOperator) o).getToken());
  }

  public int hashCode() {
    int h = hash;
    if (hash == 0) {
      for (int i = 0; i < token.length; i++) {
        h = (31 * h) + token[i];
      }
      hash = h;
    }
    return h;
  }

  public String toString() {
    return new String(token);
  }
}