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/*
 * Copyright  2003-2004 The Apache Software Foundation.
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 *  you may not use this file except in compliance with the License.
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 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
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package com.sun.org.apache.xml.internal.security.encryption;


import java.util.Iterator;


ReferenceList is an element that contains pointers from a key
value of an EncryptedKey to items encrypted by that key value
(EncryptedData or EncryptedKey elements).

It is defined as follows:

<element name='ReferenceList'>
    <complexType>
        <choice minOccurs='1' maxOccurs='unbounded'>
            <element name='DataReference' type='xenc:ReferenceType'/>
            <element name='KeyReference' type='xenc:ReferenceType'/>
        </choice>
    </complexType>
</element>

Author:
Axl Mattheus
See Also:
Reference/**
 * <code>ReferenceList</code> is an element that contains pointers from a key
 * value of an <code>EncryptedKey</code> to items encrypted by that key value
 * (<code>EncryptedData</code> or <code>EncryptedKey</code> elements).
 * <p>
 * It is defined as follows:
 * <xmp>
 * <element name='ReferenceList'>
 *     <complexType>
 *         <choice minOccurs='1' maxOccurs='unbounded'>
 *             <element name='DataReference' type='xenc:ReferenceType'/>
 *             <element name='KeyReference' type='xenc:ReferenceType'/>
 *         </choice>
 *     </complexType>
 * </element>
 * </xmp>
 *
 * @author Axl Mattheus
 * @see Reference
 */
public interface ReferenceList {
        
DATA TAG /** DATA TAG */
    public static final int DATA_REFERENCE = 0x00000001;
    
KEY TAG /** KEY TAG */
    public static final int KEY_REFERENCE  = 0x00000002;

    
Adds a reference to this reference list.
Params:
reference – the reference to add.
Throws:
IllegalAccessException – if the Reference is not an
  instance of DataReference or KeyReference./**
     * Adds a reference to this reference list.
     *
     * @param reference the reference to add.
     * @throws IllegalAccessException if the <code>Reference</code> is not an
     *   instance of <code>DataReference</code> or <code>KeyReference</code>.
     */
    public void add(Reference reference);

    
Removes a reference from the ReferenceList.
Params:
reference – the reference to remove./**
     * Removes a reference from the <code>ReferenceList</code>.
     *
     * @param reference the reference to remove.
     */
    public void remove(Reference reference);

    
Returns the size of the ReferenceList.
Returns:
the size of the ReferenceList./**
     * Returns the size of the <code>ReferenceList</code>.
     *
     * @return the size of the <code>ReferenceList</code>.
     */
    public int size();

    
Indicates if the ReferenceList is empty.
Returns:
true if the ReferenceList is
    empty, else false./**
     * Indicates if the <code>ReferenceList</code> is empty.
     *
     * @return <code><b>true</b></code> if the <code>ReferenceList</code> is
     *     empty, else <code><b>false</b></code>.
     */
    public boolean isEmpty();

    
Returns an Iterator over all the References
contatined in this ReferenceList.
Returns:
Iterator./**
     * Returns an <code>Iterator</code> over all the <code>Reference</code>s
     * contatined in this <code>ReferenceList</code>.
     *
     * @return Iterator.
     */
    public Iterator getReferences();

    
DataReference factory method. Returns a
DataReference.
Params:
uri – 
Returns:
/**
     * <code>DataReference</code> factory method. Returns a
     * <code>DataReference</code>.
     * @param uri
     * @return
     */
    public Reference newDataReference(String uri);

    
KeyReference factory method. Returns a
KeyReference.
Params:
uri – 
Returns:
/**
     * <code>KeyReference</code> factory method. Returns a
     * <code>KeyReference</code>.
     * @param uri
     * @return
     */
    public Reference newKeyReference(String uri);
}