001 /* 002 * Copyright 2004 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.metro.data; 020 021 import net.dpml.component.Directive; 022 023 /** 024 * A <code>NullDirective</code> is used to mark a solution as resolved 025 * on the basis that the solution will be managed by an enclosing component. 026 * 027 * @author <a href="http://www.dpml.net">Digital Product Meta Library</a> 028 * @version 1.0.2 029 */ 030 public class NullDirective extends AbstractDirective implements Directive 031 { 032 /** 033 * Serial version identifier. 034 */ 035 static final long serialVersionUID = 1L; 036 037 //-------------------------------------------------------------------------- 038 // constructors 039 //-------------------------------------------------------------------------- 040 041 /** 042 * Create a new null directive. 043 */ 044 public NullDirective() 045 { 046 } 047 048 //-------------------------------------------------------------------------- 049 // NullDirective 050 //-------------------------------------------------------------------------- 051 052 /** 053 * Test if the supplied object is equal to this object. 054 * @param other the object to compare with this instance 055 * @return TRUE if the supplied object is equal to this object 056 */ 057 public boolean equals( Object other ) 058 { 059 if( null == other ) 060 { 061 return false; 062 } 063 else 064 { 065 return ( other instanceof NullDirective ); 066 } 067 } 068 069 /** 070 * Return the hashcode for the instance. 071 * @return the instance hashcode 072 */ 073 public int hashCode() 074 { 075 return getClass().hashCode(); 076 } 077 }