/* AttributeSet.java -- Copyright (C) 2002, 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 the Free Software Foundation; either version 2, or (at your option) any later version. GNU Classpath is distributed in the hope that it will be useful, but 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. You should have received a copy of the GNU General Public License 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 conditions of the GNU General Public License cover the whole combination. As a special exception, the copyright holders of this library give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you may extend this exception to your version of the library, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version. */ package javax.print.attribute; /** * AttributeSet is the top-level interface for sets of printing * attributes in the Java Print Service API. *

* 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. *

*

* The following specialized types of AttributeSet are available: *

*

*

* 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}. *

*

* The Java Print Service API provides implementation classes for the existing * attribute set interfaces but applications may use their own implementations. *

* * @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 true if the set is changed, false otherwise. * @throws NullPointerException if the attribute is null. * @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 true 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 true if an attribute of the category is contained * in the set, false otherwise. */ boolean containsKey (Class category); /** * Checks if this attribute set contains the given attribute. * * @param attribute the attribute to test for. * @return true if the attribute is contained in the set, * false otherwise. */ boolean containsValue (Attribute attribute); /** * Tests this set for equality with the given object. true is * returned, if the given object is also of type AttributeSet * and the contained attributes are the same as in this set. * * @param obj the Object to test. * @return true 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 Class * instance of a class implementing the Attribute interface. * @return The attribute for this category or null if no * attribute is contained for the given category. * @throws NullPointerException if category is null. * @throws ClassCastException if category is not implementing * Attribute. */ 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 true if the attribute set is empty, false otherwise. */ boolean isEmpty (); /** * Removes the given attribute from the set. If the given attribute is null * nothing is done and false is returned. * * @param attribute the attribute to remove. * @return true 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 null nothing is done and false is returned. * * @param category the category of the entry to be removed. * @return true 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 (); }