de.intarsys.pdf.content.CSOperator Maven / Gradle / Ivy

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/*
 * Copyright (c) 2007, intarsys consulting GmbH
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
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 * - Redistributions in binary form must reproduce the above copyright notice,
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 *   prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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package de.intarsys.pdf.content;

import java.util.Arrays;

/**
 * A class representing an operator of a content stream.
 * 
 * 
 * The content stream is a sequence of operations, with any operation being a
 * list of operands followed by the operator.
 * 
 */
public class CSOperator {

	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);
	}

	/**
	 * 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;
	}

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

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

	@Override
	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;
	}

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