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1
17
18 package org.apache.el;
19
20 import java.io.Externalizable  ;
21 import java.io.IOException ;
22 import javax.el.ELContext;
23 import javax.el.PropertyNotWritableException;
24
25 import java.io.ObjectInput ;
26 import java.io.ObjectOutput ;
27
28 import javax.el.ValueExpression;
29
30 import org.apache.el.lang.ELSupport;
31 import org.apache.el.util.MessageFactory;
32 import org.apache.el.util.ReflectionUtil;
33
34
35 public final class ValueExpressionLiteral extends ValueExpression implements
36 Externalizable {
37
38 private static final long serialVersionUID = 1L;
39
40 private Object value;
41
42 private Class expectedType;
43
44 public ValueExpressionLiteral() {
45 super();
46 }
47
48 public ValueExpressionLiteral(Object value, Class expectedType) {
49 this.value = value;
50 this.expectedType = expectedType;
51 }
52
53 public Object getValue(ELContext context) {
54 if (this.expectedType != null) {
55 return ELSupport.coerceToType(this.value, this.expectedType);
56 }
57 return this.value;
58 }
59
60 public void setValue(ELContext context, Object value) {
61 throw new PropertyNotWritableException(MessageFactory.get(
62 "error.value.literal.write", this.value));
63 }
64
65 public boolean isReadOnly(ELContext context) {
66 return true;
67 }
68
69 public Class getType(ELContext context) {
70 return (this.value != null) ? this.value.getClass() : null;
71 }
72
73 public Class getExpectedType() {
74 return this.expectedType;
75 }
76
77 public String getExpressionString() {
78 return (this.value != null) ? this.value.toString() : null;
79 }
80
81 public boolean equals(Object obj) {
82 return (obj instanceof ValueExpressionLiteral && this
83 .equals((ValueExpressionLiteral) obj));
84 }
85
86 public boolean equals(ValueExpressionLiteral ve) {
87 return (ve != null && (this.value != null && ve.value != null && (this.value == ve.value || this.value
88 .equals(ve.value))));
89 }
90
91 public int hashCode() {
92 return (this.value != null) ? this.value.hashCode() : 0;
93 }
94
95 public boolean isLiteralText() {
96 return true;
97 }
98
99 public void writeExternal(ObjectOutput out) throws IOException {
100 out.writeObject(this.value);
101 out.writeUTF((this.expectedType != null) ? this.expectedType.getName()
102 : "");
103 }
104
105 public void readExternal(ObjectInput in) throws IOException ,
106 ClassNotFoundException {
107 this.value = in.readObject();
108 String type = in.readUTF();
109 if (!"".equals(type)) {
110 this.expectedType = ReflectionUtil.forName(type);
111 }
112 }
113 }
114 |
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