001    /*
002     * Copyright (c) 2005 Stephen J. McConnell
003     *
004     * Licensed  under the  Apache License,  Version 2.0  (the "License");
005     * you may not use  this file  except in  compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     *   http://www.apache.org/licenses/LICENSE-2.0
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed  under the  License is distributed on an "AS IS" BASIS,
012     * WITHOUT  WARRANTIES OR CONDITIONS  OF ANY KIND, either  express  or
013     * implied.
014     *
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    
019    package net.dpml.component;
020    
021    import java.net.URI;
022    
023    /**
024     * Exception thrown when an attempt is made to reference an unknown part.
025     *
026     * @author <a href="http://www.dpml.net">Digital Product Meta Library</a>
027     * @version 1.0.2
028     */
029    public class PartNotFoundException extends ControlException 
030    {
031       /**
032        * Serial version identifier.
033        */
034        static final long serialVersionUID = 1L;
035    
036        private URI m_target;
037        private URI m_parent;
038    
039       /**
040        * Creation of a new <tt>PartNotFoundException</tt>.
041        * @param uri the controller uri
042        * @param target the target part
043        */
044        public PartNotFoundException( URI uri, URI target )
045        {
046            this( uri, target, null );
047        }
048    
049       /**
050        * Creation of a new <tt>PartNotFoundException</tt>.
051        * @param uri the controller uri
052        * @param parent the parent part
053        * @param target the target part
054        */
055        public PartNotFoundException( URI uri, URI parent, URI target )
056        {
057            super( uri, buildMessage( parent, target ) );
058            m_target = target;
059            m_parent = parent;
060        }
061    
062       /**
063        * Return the parent part.
064        * @return the uri of the part in which the sub-part request was raised
065        */
066        public URI getParentURI()
067        {
068            return m_parent;
069        }
070    
071       /**
072        * Return the target part uri.
073        * @return the uri of the target part
074        */
075        public URI getTargetURI()
076        {
077            return m_target;
078        }
079    
080        private static String buildMessage( URI parent, URI target )
081        {
082            if( null != parent )
083            {
084                final String error = 
085                  "Could not find the a part uri ["
086                  + target
087                  + "] relative to the enclosing part ["
088                  + parent.toString()
089                  + "].";
090                return error;
091            }
092            else
093            {
094                final String error = 
095                  "Could not find a part ["
096                  + target
097                  + "].";
098                return error;
099            }
100        }
101    
102    }
103