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package javax.print.attribute.standard;

import java.util.AbstractSet;
import java.util.Iterator;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.HashMap;
import java.util.Set;

import javax.print.attribute.Attribute;
import javax.print.attribute.PrintServiceAttribute;

Class PrinterStateReasons is a printing attribute class, a set of enumeration values, that provides additional information about the printer's current state, i.e., information that augments the value of the printer's PrinterState attribute. 
 Instances of PrinterStateReason do not appear in a Print Service's attribute set directly. Rather, a PrinterStateReasons attribute appears in the Print Service's attribute set. The PrinterStateReasons attribute contains zero, one, or more than one PrinterStateReason objects which pertain to the Print Service's status, and each PrinterStateReason object is associated with a Severity level of REPORT (least severe), WARNING, or ERROR (most severe). The printer adds a PrinterStateReason object to the Print Service's PrinterStateReasons attribute when the corresponding condition becomes true of the printer, and the printer removes the 
PrinterStateReason object again when the corresponding condition becomes false, regardless of whether the Print Service's overall PrinterState also changed. 
 Class PrinterStateReasons inherits its implementation from class java.util.HashMap. Each entry in the map consists of a PrinterStateReason object (key) mapping to a Severity object (value): 
 Unlike most printing attributes which are immutable once constructed, class PrinterStateReasons is designed to be mutable; you can add PrinterStateReason objects to an existing PrinterStateReasons object and remove them again. However, like class java.util.HashMap, class PrinterStateReasons is not multiple thread safe. If a PrinterStateReasons object will be used by multiple threads, be sure to synchronize its operations (e.g., using a synchronized map view obtained from class 
java.util.Collections). 

IPP Compatibility: The string values returned by each individual PrinterStateReason object's and the associated Severity object's toString() methods,
concatenated
together with a hyphen ("-") in between, gives the IPP keyword
value. The category name returned by getName() gives the IPP
attribute name.

Author:
 Alan Kaminsky/**
 * Class PrinterStateReasons is a printing attribute class, a set of
 * enumeration values, that provides additional information about the
 * printer's current state, i.e., information that augments the value of the
 * printer's {@link PrinterState PrinterState} attribute.
 * <P>
 * Instances of {@link PrinterStateReason PrinterStateReason} do not appear in
 *  a Print Service's attribute set directly. Rather, a PrinterStateReasons
 * attribute appears in the Print Service's attribute set. The
 * PrinterStateReasons attribute contains zero, one, or more than one {@link
 * PrinterStateReason PrinterStateReason} objects which pertain to the Print
 * Service's status, and each {@link PrinterStateReason PrinterStateReason}
 * object is associated with a {@link Severity Severity} level of REPORT
 *  (least severe), WARNING, or ERROR (most severe). The printer adds a {@link
 * PrinterStateReason PrinterStateReason} object to the Print Service's
 * PrinterStateReasons attribute when the corresponding condition becomes true
 * of the printer, and the printer removes the {@link PrinterStateReason
 * PrinterStateReason} object again when the corresponding condition becomes
 * false, regardless of whether the Print Service's overall
 * {@link PrinterState PrinterState} also changed.
 * <P>
 * Class PrinterStateReasons inherits its implementation from class {@link
 * java.util.HashMap java.util.HashMap}. Each entry in the map consists of a
 * {@link PrinterStateReason PrinterStateReason} object (key) mapping to a
 * {@link Severity Severity} object (value):
 * <P>
 * Unlike most printing attributes which are immutable once constructed, class
 * PrinterStateReasons is designed to be mutable; you can add {@link
 * PrinterStateReason PrinterStateReason} objects to an existing
 * PrinterStateReasons object and remove them again. However, like class
 *  {@link java.util.HashMap java.util.HashMap}, class PrinterStateReasons is
 * not multiple thread safe. If a PrinterStateReasons object will be used by
 * multiple threads, be sure to synchronize its operations (e.g., using a
 * synchronized map view obtained from class {@link java.util.Collections
 * java.util.Collections}).
 * <P>
 * <B>IPP Compatibility:</B> The string values returned by each individual
 * {@link PrinterStateReason PrinterStateReason} object's and the associated
 * {@link Severity Severity} object's <CODE>toString()</CODE> methods,
 * concatenated
 * together with a hyphen (<CODE>"-"</CODE>) in between, gives the IPP keyword
 * value. The category name returned by <CODE>getName()</CODE> gives the IPP
 * attribute name.
 * <P>
 *
 * @author  Alan Kaminsky
 */
public final class PrinterStateReasons
    extends HashMap<PrinterStateReason,Severity>
    implements PrintServiceAttribute
{

    private static final long serialVersionUID = -3731791085163619457L;

    
Construct a new, empty printer state reasons attribute; the underlying
hash map has the default initial capacity and load factor.
/**
     * Construct a new, empty printer state reasons attribute; the underlying
     * hash map has the default initial capacity and load factor.
     */
    public PrinterStateReasons() {
        super();
    }

    
super a new, empty printer state reasons attribute; the underlying
hash map has the given initial capacity and the default load factor.
Params:
initialCapacity –  Initial capacity.
Throws:
IllegalArgumentException – if the initial capacity is less
    than zero./**
     * super a new, empty printer state reasons attribute; the underlying
     * hash map has the given initial capacity and the default load factor.
     *
     * @param  initialCapacity  Initial capacity.
     *
     * @throws IllegalArgumentException if the initial capacity is less
     *     than zero.
     */
    public PrinterStateReasons(int initialCapacity) {
        super (initialCapacity);
    }

    
Construct a new, empty printer state reasons attribute; the underlying
hash map has the given initial capacity and load factor.
Params:
initialCapacity –  Initial capacity.
loadFactor –       Load factor.
Throws:
IllegalArgumentException – if the initial capacity is less
    than zero./**
     * Construct a new, empty printer state reasons attribute; the underlying
     * hash map has the given initial capacity and load factor.
     *
     * @param  initialCapacity  Initial capacity.
     * @param  loadFactor       Load factor.
     *
     * @throws IllegalArgumentException if the initial capacity is less
     *     than zero.
     */
    public PrinterStateReasons(int initialCapacity, float loadFactor) {
        super (initialCapacity, loadFactor);
    }

    
Construct a new printer state reasons attribute that contains the same PrinterStateReason-to-
Severity mappings as the given map. The underlying hash map's initial capacity and load factor are as specified in the superclass constructor 
HashMap(Map). 
Params:
map –  Map to copy.
Throws:
NullPointerException – 
    (unchecked exception) Thrown if map is null or if any
    key or value in map is null.
ClassCastException – 
    (unchecked exception) Thrown if any key in map is not an instance of class PrinterStateReason or if any value in map is not an instance of class Severity./**
     * Construct a new printer state reasons attribute that contains the same
     * {@link PrinterStateReason PrinterStateReason}-to-{@link Severity
     * Severity} mappings as the given map. The underlying hash map's initial
     * capacity and load factor are as specified in the superclass constructor
     * {@link java.util.HashMap#HashMap(java.util.Map)
     * HashMap(Map)}.
     *
     * @param  map  Map to copy.
     *
     * @exception  NullPointerException
     *     (unchecked exception) Thrown if <CODE>map</CODE> is null or if any
     *     key or value in <CODE>map</CODE> is null.
     * @throws  ClassCastException
     *     (unchecked exception) Thrown if any key in <CODE>map</CODE> is not
     *   an instance of class {@link PrinterStateReason PrinterStateReason} or
     *     if any value in <CODE>map</CODE> is not an instance of class
     *     {@link Severity Severity}.
     */
    public PrinterStateReasons(Map<PrinterStateReason,Severity> map) {
        this();
        for (Map.Entry<PrinterStateReason,Severity> e : map.entrySet())
            put(e.getKey(), e.getValue());
    }

    
Adds the given printer state reason to this printer state reasons
attribute, associating it with the given severity level. If this
printer state reasons attribute previously contained a mapping for the
given printer state reason, the old value is replaced.
Params:
reason –  Printer state reason. This must be an instance of class PrinterStateReason.
severity –  Severity of the printer state reason. This must be an instance of class Severity.
Throws:
NullPointerException – 
    (unchecked exception) Thrown if reason is null or
    severity is null.
ClassCastException – 
    (unchecked exception) Thrown if reason is not an instance of class PrinterStateReason or if severity is not an instance of class 
    Severity.
Returns:
 Previous severity associated with the given printer state
         reason, or null if the given printer state reason was
         not present.
Since:
1.5/**
     * Adds the given printer state reason to this printer state reasons
     * attribute, associating it with the given severity level. If this
     * printer state reasons attribute previously contained a mapping for the
     * given printer state reason, the old value is replaced.
     *
     * @param  reason    Printer state reason. This must be an instance of
     *                    class {@link PrinterStateReason PrinterStateReason}.
     * @param  severity  Severity of the printer state reason. This must be
     *                      an instance of class {@link Severity Severity}.
     *
     * @return  Previous severity associated with the given printer state
     *          reason, or <tt>null</tt> if the given printer state reason was
     *          not present.
     *
     * @throws  NullPointerException
     *     (unchecked exception) Thrown if <CODE>reason</CODE> is null or
     *     <CODE>severity</CODE> is null.
     * @throws  ClassCastException
     *     (unchecked exception) Thrown if <CODE>reason</CODE> is not an
     *   instance of class {@link PrinterStateReason PrinterStateReason} or if
     *     <CODE>severity</CODE> is not an instance of class {@link Severity
     *     Severity}.
     * @since 1.5
     */
    public Severity put(PrinterStateReason reason, Severity severity) {
        if (reason == null) {
            throw new NullPointerException("reason is null");
        }
        if (severity == null) {
            throw new NullPointerException("severity is null");
        }
        return super.put(reason, severity);
    }

    
Get the printing attribute class which is to be used as the "category"
for this printing attribute value.

For class PrinterStateReasons, the
category is class PrinterStateReasons itself.
Returns:
 Printing attribute class (category), an instance of class java.lang.Class./**
     * Get the printing attribute class which is to be used as the "category"
     * for this printing attribute value.
     * <P>
     * For class PrinterStateReasons, the
     * category is class PrinterStateReasons itself.
     *
     * @return  Printing attribute class (category), an instance of class
     *          {@link java.lang.Class java.lang.Class}.
     */
    public final Class<? extends Attribute> getCategory() {
        return PrinterStateReasons.class;
    }

    
Get the name of the category of which this attribute value is an
instance.

For class PrinterStateReasons, the
category name is "printer-state-reasons".
Returns:
 Attribute category name./**
     * Get the name of the category of which this attribute value is an
     * instance.
     * <P>
     * For class PrinterStateReasons, the
     * category name is <CODE>"printer-state-reasons"</CODE>.
     *
     * @return  Attribute category name.
     */
    public final String getName() {
        return "printer-state-reasons";
    }

    
Obtain an unmodifiable set view of the individual printer state reason attributes at the given severity level in this PrinterStateReasons attribute. Each element in the set view is a 
PrinterStateReason object. The only elements in the set view are the PrinterStateReason objects that map to the given severity value. The set view is backed by this PrinterStateReasons attribute, so changes to this PrinterStateReasons attribute are reflected in the set view. The set view does not support element insertion or removal. The set view's iterator does not support element removal. 
Params:
severity –  Severity level.
Throws:
NullPointerException – 
    (unchecked exception) Thrown if severity is null.
Returns:
 Set view of the individual 
         PrinterStateReason attributes at the given 
         Severity level./**
     * Obtain an unmodifiable set view of the individual printer state reason
     * attributes at the given severity level in this PrinterStateReasons
     * attribute. Each element in the set view is a {@link PrinterStateReason
     * PrinterStateReason} object. The only elements in the set view are the
     * {@link PrinterStateReason PrinterStateReason} objects that map to the
     * given severity value. The set view is backed by this
     * PrinterStateReasons attribute, so changes to this PrinterStateReasons
     * attribute are reflected  in the set view.
     * The set view does not support element insertion or
     * removal. The set view's iterator does not support element removal.
     *
     * @param  severity  Severity level.
     *
     * @return  Set view of the individual {@link PrinterStateReason
     *          PrinterStateReason} attributes at the given {@link Severity
     *          Severity} level.
     *
     * @exception  NullPointerException
     *     (unchecked exception) Thrown if <CODE>severity</CODE> is null.
     */
    public Set<PrinterStateReason> printerStateReasonSet(Severity severity) {
        if (severity == null) {
            throw new NullPointerException("severity is null");
        }
        return new PrinterStateReasonSet (severity, entrySet());
    }

    private class PrinterStateReasonSet
        extends AbstractSet<PrinterStateReason>
    {
        private Severity mySeverity;
        private Set myEntrySet;

        public PrinterStateReasonSet(Severity severity, Set entrySet) {
            mySeverity = severity;
            myEntrySet = entrySet;
        }

        public int size() {
            int result = 0;
            Iterator iter = iterator();
            while (iter.hasNext()) {
                iter.next();
                ++ result;
            }
            return result;
        }

        public Iterator iterator() {
            return new PrinterStateReasonSetIterator(mySeverity,
                                                     myEntrySet.iterator());
        }
    }

    private class PrinterStateReasonSetIterator implements Iterator {
        private Severity mySeverity;
        private Iterator myIterator;
        private Map.Entry myEntry;

        public PrinterStateReasonSetIterator(Severity severity,
                                             Iterator iterator) {
            mySeverity = severity;
            myIterator = iterator;
            goToNext();
        }

        private void goToNext() {
            myEntry = null;
            while (myEntry == null && myIterator.hasNext()) {
                myEntry = (Map.Entry) myIterator.next();
                if ((Severity) myEntry.getValue() != mySeverity) {
                    myEntry = null;
                }
            }
        }

        public boolean hasNext() {
            return myEntry != null;
        }

        public Object next() {
            if (myEntry == null) {
                throw new NoSuchElementException();
            }
            Object result = myEntry.getKey();
            goToNext();
            return result;
        }

        public void remove() {
            throw new UnsupportedOperationException();
        }
    }

}