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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>";
63 }
64
65 }