001    /*
002     * Copyright 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.state;
020    
021    import java.io.Serializable;
022    
023    /**
024     * Default implementation of an operation.
025     *
026     * @author <a href="http://www.dpml.net">Digital Product Meta Library</a>
027     * @version 1.0.1
028     */
029    public class DefaultInterface implements Interface, Serializable
030    {
031        private final String m_classname;
032        
033       /**
034        * Creation of a new interface declaration.
035        * @param classname the overriding method name
036        * @exception NullPointerException if the operation name is null
037        */
038        public DefaultInterface( String classname ) throws NullPointerException
039        {
040            if( null == classname )
041            {
042                throw new NullPointerException( "classname" );
043            }
044            m_classname = classname;
045        }
046        
047       /**
048        * Overriden method returning the interface classname.
049        * @return the name (interface classname)
050        * @see #getClassname()
051        */
052        public String getName()
053        {
054            return getClassname();
055        }
056        
057       /**
058        * Return the interface classname.
059        * @return the classname
060        */
061        public String getClassname()
062        {
063            return m_classname;
064        }
065        
066       /**
067        * Return a string representation of the instance.
068        * @return the string value
069        */
070        public String toString()
071        {
072            return "interface:" + m_classname;
073        }
074        
075       /**
076        * Compare this object to another for equality.
077        * @param other the other object
078        * @return true if the object is equal to this object
079        */
080        public boolean equals( Object other )
081        {
082            if( null == other )
083            {
084                return false;
085            }
086            else if( other instanceof DefaultInterface )
087            {
088                DefaultInterface description = (DefaultInterface) other;
089                return m_classname.equals( description.m_classname );
090            }
091            else
092            {
093                return false;
094            }
095        }
096        
097       /**
098        * Compute the hashcode for this instance.
099        * @return the hashcode value
100        */
101        public int hashCode()
102        {
103            int hash = getClass().hashCode();
104            hash ^= m_classname.hashCode();
105            return hash;
106        }
107    }