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    1   /*
    2    * Licensed to the Apache Software Foundation (ASF) under one or more
    3    * contributor license agreements.  See the NOTICE file distributed with
    4    * this work for additional information regarding copyright ownership.
    5    * The ASF licenses this file to You under the Apache License, Version 2.0
    6    * (the "License"); you may not use this file except in compliance with
    7    * the License.  You may obtain a copy of the License at
    8    * 
    9    *     http://www.apache.org/licenses/LICENSE-2.0
   10    * 
   11    * Unless required by applicable law or agreed to in writing, software 
   12    * distributed under the License is distributed on an "AS IS" BASIS, 
   13    * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
   14    * See the License for the specific language governing permissions and 
   15    * limitations under the License.
   16    */
   17   
   18   package org.apache.jdo.impl.model.java;
   19   
   20   import org.apache.jdo.model.java.JavaType;
   21   
   22   /**
   23    * An instance of class ErrorType represents an erroneous type. Components
   24    * such as the semantic analysis may use this type to indicate an error
   25    * situtaion. It is compatible to all other types. 
   26    * 
   27    * @author Michael Bouschen
   28    * @since JDO 1.0.1
   29    */
   30   public class ErrorType
   31       extends AbstractJavaType
   32   {
   33       /** The singleton ErrorType instance. */
   34       public static final ErrorType errorType = new ErrorType();
   35   
   36       /** 
   37        * Creates new a ErrorType instance. This constructor should not be 
   38        * called directly; instead, the singleton instance  {@link #errorType}
   39        * should be used. 
   40        */
   41       protected ErrorType() {}
   42   
   43       /** 
   44        * Returns true if this JavaType is compatible with the specified
   45        * JavaType. This implementation always returns <code>true</code>,
   46        * because ErrorType is compatible with any other type.
   47        * @param javaType the type this JavaType is checked with.
   48        * @return <code>true</code> if this is compatible with the specified
   49        * type; <code>false</code> otherwise.
   50        */
   51       public boolean isCompatibleWith(JavaType javaType)
   52       {
   53           return true;
   54       }
   55       
   56       /** 
   57        * Returns the name of the type.  
   58        * @return type name
   59        */
   60       public String getName()
   61       {
   62           return "<error type>"; //NOI18N
   63       }
   64   
   65   }

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