TextSyntax.java

/* TextSyntax.java -- 
   Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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any later version.

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WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

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along with GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
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permission to link this library with independent modules to produce an
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package javax.print.attribute;

import java.io.Serializable;
import java.util.Locale;

/**
 * <code>TextSyntax</code> is the abstract base class of all attribute 
 * classes which provide a string as value (e.g. the location of the printer).
 * <p>
 * A <code>TextSyntax</code> instance consists of a string value and a
 * locale which indicates the language of the locale of the string.
 * </p>
 *
 * @author Michael Koch (konqueror@gmx.de)
 */
public abstract class TextSyntax implements Cloneable, Serializable
{
  private static final long serialVersionUID = -8130648736378144102L;
  
  private String value;
  private Locale locale;

  /**
   * Creates a <code>TextSyntax</code> object with the given value
   * and locale.
   *
   * @param value the value for this syntax
   * @param locale the locale to use, if <code>null</code> the default
   * locale is used.
   *
   * @exception NullPointerException if value is null
   */
  protected TextSyntax(String value, Locale locale)
  {
    if (value == null)
      throw new NullPointerException("value may not be null");
    
    this.value = value;
    this.locale = (locale == null ? Locale.getDefault() : locale);
  }

  /**
   * Returns the value of this syntax object.
   *
   * @return The value.
   */
  public String getValue()
  {
    return value;
  }

  /**
   * Returns the locale of this syntax object.
   *
   * @return The locale.
   */
  public Locale getLocale()
  {
    return locale;
  }

  /**
   * Returns the hashcode for this object.
   *
   * @return The hashcode.
   */
  public int hashCode()
  {
    return value.hashCode() ^ locale.hashCode();
  }

  /**
   * Tests if the given object is equal to this object.
   *
   * @param obj the object to test
   *
   * @return true if both objects are equal, false otherwise.
   */
  public boolean equals(Object obj)
  {
    if (! (obj instanceof TextSyntax))
      return false;

    TextSyntax tmp = (TextSyntax) obj;
    
    return (value.equals(tmp.getValue())
            && locale.equals(tmp.getLocale()));
  }

  /**
   * Returns a string representing the object. The returned
   * string is the underlying text value of this object.
   * 
   * @return The string representation.
   */
  public String toString()
  {
    return getValue();
  }
}