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/* AttributeSet.java --

   Copyright (C) 2002, 2005 Free Software Foundation, Inc.

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package javax.print.attribute;

/**

 * <code>AttributeSet</code> is the top-level interface for sets of printing

 * attributes in the Java Print Service API.

 * <p>

 * There are no duplicate values allowed in an attribute set and there is

 * at most one attribute object contained per category type. Based on the

 * {@link java.util.Map} interface the values of attribute sets are objects

 * of type {@link javax.print.attribute.Attribute} and the entries are the

 * categories as {@link java.lang.Class} instances.

 * </p>

 * <p>

 * The following specialized types of <code>AttributeSet</code> are available:

 * <ul>

 *  <li>{@link javax.print.attribute.DocAttributeSet}</li>

 *  <li>{@link javax.print.attribute.PrintRequestAttributeSet}</li>

 *  <li>{@link javax.print.attribute.PrintJobAttributeSet}</li>

 *  <li>{@link javax.print.attribute.PrintServiceAttributeSet}</li>

 * </ul>

 * </p>

 * <p>

 * Attribute sets may be unmodifiable depending on the context of usage. If

 * used as read-only attribute set modifying operations throw an

 * {@link javax.print.attribute.UnmodifiableSetException}.

 * </p>

 * <p>

 * The Java Print Service API provides implementation classes for the existing

 * attribute set interfaces but applications may use their own implementations.

 * </p>

 *

 * @author Michael Koch (konqueror@gmx.de)

 */

public interface AttributeSet

{

  /**

   * Adds the specified attribute value to this attribute set

   * if it is not already present.

   *

   * This operation removes any existing attribute of the same category

   * before adding the given attribute to the set.

   *

   * @param attribute the attribute to add.

   * @return <code>true</code> if the set is changed, false otherwise.

   * @throws NullPointerException if the attribute is <code>null</code>.

   * @throws UnmodifiableSetException if the set does not support modification.

   */

  boolean add (Attribute attribute);

  /**

   * Adds all of the elements in the specified set to this attribute set.

   *

   * @param attributes the set of attributes to add.

   * @return <code>true</code> if the set is changed, false otherwise.

   * @throws UnmodifiableSetException if the set does not support modification.

   *

   * @see #add(Attribute)

   */

  boolean addAll (AttributeSet attributes);

  /**

   * Removes all attributes from this attribute set.

   *

   * @throws UnmodifiableSetException if the set does not support modification.

   */

  void clear ();

  /**

   * Checks if this attributes set contains an attribute with the given

   * category.

   *

   * @param category the category to test for.

   * @return <code>true</code> if an attribute of the category is contained

   * in the set, <code>false</code> otherwise.

   */

  boolean containsKey (Class<?> category);

  /**

   * Checks if this attribute set contains the given attribute.

   *

   * @param attribute the attribute to test for.

   * @return <code>true</code> if the attribute is contained in the set,

   * <code>false</code> otherwise.

   */

  boolean containsValue (Attribute attribute);

  /**

   * Tests this set for equality with the given object. <code>true</code> is

   * returned, if the given object is also of type <code>AttributeSet</code>

   * and the contained attributes are the same as in this set.

   *

   * @param obj the Object to test.

   * @return <code>true</code> if equal, false otherwise.

   */

  boolean equals (Object obj);

  /**

   * Returns the attribute object contained in this set for the given attribute

   * category.

   *

   * @param category the category of the attribute. A <code>Class</code>

   * instance of a class implementing the <code>Attribute</code> interface.

   * @return The attribute for this category or <code>null</code> if no

   * attribute is contained for the given category.

   * @throws NullPointerException if category is null.

   * @throws ClassCastException if category is not implementing

   * <code>Attribute</code>.

   */

  Attribute get (Class<?> category);

  /**

   * Returns the hashcode value. The hashcode value is the sum of all hashcodes

   * of the attributes contained in this set.

   *

   * @return The hashcode for this attribute set.

   */

  int hashCode ();

  /**

   * Checks if the attribute set is empty.

   *

   * @return <code>true</code> if the attribute set is empty, false otherwise.

   */

  boolean isEmpty ();

  /**

   * Removes the given attribute from the set. If the given attribute is <code>null</code>

   * nothing is done and <code>false</code> is returned.

   *

   * @param attribute the attribute to remove.

   * @return <code>true</code> if removed, false in all other cases.

   * @throws UnmodifiableSetException if the set does not support modification.

   */

  boolean remove (Attribute attribute);

  /**

   * Removes the attribute entry of the given category from the set. If the given

   * category is <code>null</code> nothing is done and <code>false</code> is returned.

   *

   * @param category the category of the entry to be removed.

   * @return <code>true</code> if an attribute is removed, false in all other cases.

   * @throws UnmodifiableSetException if the set does not support modification.

   */

  boolean remove (Class<?> category);

  /**

   * Returns the number of elements in this attribute set.

   *

   * @return The number of elements.

   */

  int size ();

  /**

   * Returns the content of the attribute set as an array

   *

   * @return An array of attributes.

   */

  Attribute[] toArray ();

}