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package javax.print.attribute;


Interface AttributeSet specifies the interface for a set of printing attributes. A printing attribute is an object whose class implements interface Attribute. 

An attribute set contains a group of attribute values,
where duplicate values are not allowed in the set.
Furthermore, each value in an attribute set is
a member of some category, and at most one value in any particular category is allowed in the set. For an attribute set, the values are Attribute objects, and the categories are 
Class objects. An attribute's category is the class (or interface) at the root of the class hierarchy for that kind of attribute. Note that an attribute object's category may be a superclass of the attribute object's class rather than the attribute object's class itself. An attribute object's category is determined by calling the getCategory() method defined in interface 
Attribute. 

The interfaces of an AttributeSet resemble those of the Java Collections
API's java.util.Map interface, but is more restrictive in the types
it will accept, and combines keys and values into an Attribute.

 Attribute sets are used in several places in the Print Service API. In each context, only certain kinds of attributes are allowed to appear in the attribute set, as determined by the tagging interfaces which the attribute class implements -- DocAttribute, PrintRequestAttribute, 
PrintJobAttribute, and 
PrintServiceAttribute. There are four specializations of an attribute set that are restricted to contain just one of the four kinds of attribute -- 
DocAttributeSet, 
PrintRequestAttributeSet, PrintJobAttributeSet, and PrintServiceAttributeSet, respectively. Note that many attribute classes implement more than one tagging interface and so may appear in more than one context. 



In some contexts, the client is only allowed to examine an attribute set's
contents but not change them (the set is read-only). In other places, the
client is allowed both to examine and to change an attribute set's contents
(the set is read-write). For a read-only attribute set, calling a mutating
operation throws an UnmodifiableSetException.

 The Print Service API provides one implementation of interface AttributeSet, class HashAttributeSet. A client can use class HashAttributeSet or provide its own implementation of interface AttributeSet. The Print Service API also provides implementations of interface AttributeSet's subinterfaces -- classes HashDocAttributeSet, 
HashPrintRequestAttributeSet, 
HashPrintJobAttributeSet, and 
HashPrintServiceAttributeSet. 


Author: Alan Kaminsky
/**
 * Interface AttributeSet specifies the interface for a set of printing
 * attributes. A printing attribute is an object whose class implements
 * interface {@link Attribute Attribute}.
 * <P>
 * An attribute set contains a group of <I>attribute values,</I>
 * where duplicate values are not allowed in the set.
 * Furthermore, each value in an attribute set is
 * a member of some <I>category,</I> and at most one value in any particular
 * category is allowed in the set. For an attribute set, the values are {@link
 * Attribute Attribute} objects, and the categories are {@link java.lang.Class
 * Class} objects. An attribute's category is the class (or interface) at the
 * root of the class hierarchy for that kind of attribute. Note that an
 * attribute object's category may be a superclass of the attribute object's
 * class rather than the attribute object's class itself. An attribute
 * object's
 * category is determined by calling the {@link Attribute#getCategory()
 * <CODE>getCategory()</CODE>} method defined in interface {@link Attribute
 * Attribute}.
 * <P>
 * The interfaces of an AttributeSet resemble those of the Java Collections
 * API's java.util.Map interface, but is more restrictive in the types
 * it will accept, and combines keys and values into an Attribute.
 * <P>
 * Attribute sets are used in several places in the Print Service API. In
 * each context, only certain kinds of attributes are allowed to appear in the
 * attribute set, as determined by the tagging interfaces which the attribute
 * class implements -- {@link DocAttribute DocAttribute}, {@link
 * PrintRequestAttribute PrintRequestAttribute}, {@link PrintJobAttribute
 * PrintJobAttribute}, and {@link PrintServiceAttribute
 * PrintServiceAttribute}.
 * There are four specializations of an attribute set that are restricted to
 * contain just one of the four kinds of attribute -- {@link DocAttributeSet
 * DocAttributeSet}, {@link PrintRequestAttributeSet
 * PrintRequestAttributeSet},
 * {@link PrintJobAttributeSet PrintJobAttributeSet}, and {@link
 * PrintServiceAttributeSet PrintServiceAttributeSet}, respectively. Note that
 * many attribute classes implement more than one tagging interface and so may
 * appear in more than one context.
 * <UL>
 * <LI>
 * A {@link DocAttributeSet DocAttributeSet}, containing {@link DocAttribute
 * DocAttribute}s, specifies the characteristics of an individual doc and the
 * print job settings to be applied to an individual doc.
 * <P>
 * <LI>
 * A {@link PrintRequestAttributeSet PrintRequestAttributeSet}, containing
 * {@link PrintRequestAttribute PrintRequestAttribute}s, specifies the
 * settings
 * to be applied to a whole print job and to all the docs in the print job.
 * <P>
 * <LI>
 * A {@link PrintJobAttributeSet PrintJobAttributeSet}, containing {@link
 * PrintJobAttribute PrintJobAttribute}s, reports the status of a print job.
 * <P>
 * <LI>
 * A {@link PrintServiceAttributeSet PrintServiceAttributeSet}, containing
 * {@link PrintServiceAttribute PrintServiceAttribute}s, reports the status of
 *  a Print Service instance.
 * </UL>
 * <P>
 * In some contexts, the client is only allowed to examine an attribute set's
 * contents but not change them (the set is read-only). In other places, the
 * client is allowed both to examine and to change an attribute set's contents
 * (the set is read-write). For a read-only attribute set, calling a mutating
 * operation throws an UnmodifiableSetException.
 * <P>
 * The Print Service API provides one implementation of interface
 * AttributeSet, class {@link HashAttributeSet HashAttributeSet}.
 * A client can use class {@link
 * HashAttributeSet HashAttributeSet} or provide its own implementation of
 * interface AttributeSet. The Print Service API also provides
 * implementations of interface AttributeSet's subinterfaces -- classes {@link
 * HashDocAttributeSet HashDocAttributeSet},
 * {@link HashPrintRequestAttributeSet
 * HashPrintRequestAttributeSet}, {@link HashPrintJobAttributeSet
 * HashPrintJobAttributeSet}, and {@link HashPrintServiceAttributeSet
 * HashPrintServiceAttributeSet}.
 * <P>
 *
 * @author  Alan Kaminsky
 */
public interface AttributeSet {


    
Returns the attribute value which this attribute set contains in the
given attribute category. Returns null if this attribute set
does not contain any attribute value in the given attribute category.

Params:
  • category –  Attribute category whose associated attribute value is to be returned. It must be a Class that implements interface 
                  Attribute.
Throws:
Returns: The attribute value in the given attribute category contained
         in this attribute set, or null if this attribute set
         does not contain any attribute value in the given attribute
         category.
/**
     * Returns the attribute value which this attribute set contains in the
     * given attribute category. Returns <tt>null</tt> if this attribute set
     * does not contain any attribute value in the given attribute category.
     *
     * @param  category  Attribute category whose associated attribute value
     *                   is to be returned. It must be a
     *                   {@link java.lang.Class Class}
     *                   that implements interface {@link Attribute
     *                   Attribute}.
     *
     * @return  The attribute value in the given attribute category contained
     *          in this attribute set, or <tt>null</tt> if this attribute set
     *          does not contain any attribute value in the given attribute
     *          category.
     *
     * @throws  NullPointerException
     *     (unchecked exception) Thrown if the <CODE>category</CODE> is null.
     * @throws  ClassCastException
     *     (unchecked exception) Thrown if the <CODE>category</CODE> is not a
     *     {@link java.lang.Class Class} that implements interface {@link
     *     Attribute Attribute}.
     */
    public Attribute get(Class<?> category);

    
Adds the specified attribute to this attribute set if it is not
already present, first removing any existing value in the same
attribute category as the specified attribute value.

Params:
  • attribute –  Attribute value to be added to this attribute set.
Throws:
Returns: true if this attribute set changed as a result of the
         call, i.e., the given attribute value was not already a member
         of this attribute set.
/**
     * Adds the specified attribute to this attribute set if it is not
     * already present, first removing any existing value in the same
     * attribute category as the specified attribute value.
     *
     * @param  attribute  Attribute value to be added to this attribute set.
     *
     * @return  <tt>true</tt> if this attribute set changed as a result of the
     *          call, i.e., the given attribute value was not already a member
     *          of this attribute set.
     *
     * @throws  NullPointerException
     *     (unchecked exception) Thrown if the <CODE>attribute</CODE> is null.
     * @throws  UnmodifiableSetException
     *     (unchecked exception) Thrown if this attribute set does not support
     *     the <CODE>add()</CODE> operation.
     */
    public boolean add(Attribute attribute);


    
Removes any attribute for this category from this attribute set if
present. If category is null, then
remove() does nothing and returns false.

Params:
  • category – Attribute category to be removed from this
                 attribute set.
Throws:
  • UnmodifiableSetException – 
    (unchecked exception) Thrown if this attribute set does not support
    the remove() operation.
Returns: true if this attribute set changed as a result of the
        call, i.e., the given attribute value had been a member of this
         attribute set.
/**
     * Removes any attribute for this category from this attribute set if
     * present. If <CODE>category</CODE> is null, then
     * <CODE>remove()</CODE> does nothing and returns <tt>false</tt>.
     *
     * @param  category Attribute category to be removed from this
     *                  attribute set.
     *
     * @return  <tt>true</tt> if this attribute set changed as a result of the
     *         call, i.e., the given attribute value had been a member of this
     *          attribute set.
     *
     * @throws  UnmodifiableSetException
     *     (unchecked exception) Thrown if this attribute set does not support
     *     the <CODE>remove()</CODE> operation.
     */
    public boolean remove(Class<?> category);

    
Removes the specified attribute from this attribute set if
present. If attribute is null, then
remove() does nothing and returns false.

Params:
  • attribute – Attribute value to be removed from this attribute set.
Throws:
  • UnmodifiableSetException – 
    (unchecked exception) Thrown if this attribute set does not support
    the remove() operation.
Returns: true if this attribute set changed as a result of the
        call, i.e., the given attribute value had been a member of this
         attribute set.
/**
     * Removes the specified attribute from this attribute set if
     * present. If <CODE>attribute</CODE> is null, then
     * <CODE>remove()</CODE> does nothing and returns <tt>false</tt>.
     *
     * @param  attribute Attribute value to be removed from this attribute set.
     *
     * @return  <tt>true</tt> if this attribute set changed as a result of the
     *         call, i.e., the given attribute value had been a member of this
     *          attribute set.
     *
     * @throws  UnmodifiableSetException
     *     (unchecked exception) Thrown if this attribute set does not support
     *     the <CODE>remove()</CODE> operation.
     */
    public boolean remove(Attribute attribute);

    
Returns true if this attribute set contains an
attribute for the specified category.

Params:
  • category – whose presence in this attribute set is
           to be tested.
Returns: true if this attribute set contains an attribute
        value for the specified category.
/**
     * Returns <tt>true</tt> if this attribute set contains an
     * attribute for the specified category.
     *
     * @param  category whose presence in this attribute set is
     *            to be tested.
     *
     * @return  <tt>true</tt> if this attribute set contains an attribute
     *         value for the specified category.
     */
    public boolean containsKey(Class<?> category);

    
Returns true if this attribute set contains the given
attribute value.

Params:
  • attribute –  Attribute value whose presence in this
attribute set is to be tested.
Returns: true if this attribute set contains the given
     attribute  value.
/**
     * Returns <tt>true</tt> if this attribute set contains the given
     * attribute value.
     *
     * @param  attribute  Attribute value whose presence in this
     * attribute set is to be tested.
     *
     * @return  <tt>true</tt> if this attribute set contains the given
     *      attribute  value.
     */
    public boolean containsValue(Attribute attribute);

    
Adds all of the elements in the specified set to this attribute. The outcome is the same as if the = add(Attribute) operation had been applied to this attribute set successively with each element from the specified set. The behavior of the addAll(AttributeSet)
operation is unspecified if the specified set is modified while
the operation is in progress.


If the addAll(AttributeSet) operation throws an exception,
the effect on this attribute set's state is implementation dependent;
elements from the specified set before the point of the exception may
or may not have been added to this attribute set.

Params:
  • attributes –  whose elements are to be added to this attribute
           set.
Throws:
  • UnmodifiableSetException – 
    (Unchecked exception) Thrown if this attribute set does not support
    the addAll(AttributeSet) method.
  • NullPointerException – 
    (Unchecked exception) Thrown if some element in the specified
    set is null.
See Also:
Returns: true if this attribute set changed as a result of the
         call.
/**
     * Adds all of the elements in the specified set to this attribute.
     * The outcome is the same as if the =
     * {@link #add(Attribute) <CODE>add(Attribute)</CODE>}
     * operation had been applied to this attribute set successively with each
     * element from the specified set.
     * The behavior of the <CODE>addAll(AttributeSet)</CODE>
     * operation is unspecified if the specified set is modified while
     * the operation is in progress.
     * <P>
     * If the <CODE>addAll(AttributeSet)</CODE> operation throws an exception,
     * the effect on this attribute set's state is implementation dependent;
     * elements from the specified set before the point of the exception may
     * or may not have been added to this attribute set.
     *
     * @param  attributes  whose elements are to be added to this attribute
     *            set.
     *
     * @return  <tt>true</tt> if this attribute set changed as a result of the
     *          call.
     *
     * @throws  UnmodifiableSetException
     *     (Unchecked exception) Thrown if this attribute set does not support
     *     the <tt>addAll(AttributeSet)</tt> method.
     * @throws  NullPointerException
     *     (Unchecked exception) Thrown if some element in the specified
     *     set is null.
     *
     * @see #add(Attribute)
     */
    public boolean addAll(AttributeSet attributes);

    
Returns the number of attributes in this attribute set. If this
attribute set contains more than Integer.MAX_VALUE elements,
returns  Integer.MAX_VALUE.

Returns: The number of attributes in this attribute set.
/**
     * Returns the number of attributes in this attribute set. If this
     * attribute set contains more than <tt>Integer.MAX_VALUE</tt> elements,
     * returns  <tt>Integer.MAX_VALUE</tt>.
     *
     * @return  The number of attributes in this attribute set.
     */
    public int size();

    
Returns an array of the attributes contained in this set.

Returns:the Attributes contained in this set as an array, zero length
if the AttributeSet is empty.
/**
     * Returns an array of the attributes contained in this set.
     * @return the Attributes contained in this set as an array, zero length
     * if the AttributeSet is empty.
     */
    public Attribute[] toArray();


    
Removes all attributes from this attribute set.

Throws:
  • UnmodifiableSetException – 
  (unchecked exception) Thrown if this attribute set does not support
    the clear() operation.
/**
     * Removes all attributes from this attribute set.
     *
     * @throws  UnmodifiableSetException
     *   (unchecked exception) Thrown if this attribute set does not support
     *     the <CODE>clear()</CODE> operation.
     */
    public void clear();

    
Returns true if this attribute set contains no attributes.

Returns:true if this attribute set contains no attributes.
/**
     * Returns true if this attribute set contains no attributes.
     *
     * @return true if this attribute set contains no attributes.
     */
    public boolean isEmpty();

    
Compares the specified object with this attribute set for equality.
Returns true if the given object is also an attribute set and
the two attribute sets contain the same attribute category-attribute
value mappings. This ensures that the
equals() method works properly across different
implementations of the AttributeSet interface.

Params:
  • object – to be compared for equality with this attribute set.
Returns: true if the specified object is equal to this
      attribute   set.
/**
     * Compares the specified object with this attribute set for equality.
     * Returns <tt>true</tt> if the given object is also an attribute set and
     * the two attribute sets contain the same attribute category-attribute
     * value mappings. This ensures that the
     * <tt>equals()</tt> method works properly across different
     * implementations of the AttributeSet interface.
     *
     * @param  object to be compared for equality with this attribute set.
     *
     * @return  <tt>true</tt> if the specified object is equal to this
     *       attribute   set.
     */
    public boolean equals(Object object);

    
Returns the hash code value for this attribute set. The hash code of an
attribute set is defined to be the sum of the hash codes of each entry
in the AttributeSet.
This ensures that t1.equals(t2) implies that
t1.hashCode()==t2.hashCode() for any two attribute sets
t1 and t2, as required by the general contract of Object.hashCode(). 
Returns: The hash code value for this attribute set.
/**
     * Returns the hash code value for this attribute set. The hash code of an
     * attribute set is defined to be the sum of the hash codes of each entry
     * in the AttributeSet.
     * This ensures that <tt>t1.equals(t2)</tt> implies that
     * <tt>t1.hashCode()==t2.hashCode()</tt> for any two attribute sets
     * <tt>t1</tt> and <tt>t2</tt>, as required by the general contract of
     * {@link java.lang.Object#hashCode() <CODE>Object.hashCode()</CODE>}.
     *
     * @return  The hash code value for this attribute set.
     */
    public int hashCode();

}