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1 package com.sun.el;
23
24 import java.io.Externalizable  ;
25 import java.io.IOException ;
26 import javax.el.ELContext;
27 import javax.el.PropertyNotWritableException;
28
29 import java.io.ObjectInput ;
30 import java.io.ObjectOutput ;
31
32 import javax.el.ValueExpression;
33
34 import com.sun.el.lang.ELSupport;
35 import com.sun.el.util.MessageFactory;
36 import com.sun.el.util.ReflectionUtil;
37
38 public final class ValueExpressionLiteral extends ValueExpression implements
39 Externalizable {
40
41 private static final long serialVersionUID = 1L;
42
43 private Object value;
44
45 private Class expectedType;
46
47 public ValueExpressionLiteral() {
48 super();
49 }
50
51 public ValueExpressionLiteral(Object value, Class expectedType) {
52 this.value = value;
53 this.expectedType = expectedType;
54 }
55
56 public Object getValue(ELContext context) {
57 if (this.expectedType != null) {
58 return ELSupport.coerceToType(this.value, this.expectedType);
59 }
60 return this.value;
61 }
62
63 public void setValue(ELContext context, Object value) {
64 throw new PropertyNotWritableException(MessageFactory.get(
65 "error.value.literal.write", this.value));
66 }
67
68 public boolean isReadOnly(ELContext context) {
69 return true;
70 }
71
72 public Class getType(ELContext context) {
73 return (this.value != null) ? this.value.getClass() : null;
74 }
75
76 public Class getExpectedType() {
77 return this.expectedType;
78 }
79
80 public String getExpressionString() {
81 return (this.value != null) ? this.value.toString() : null;
82 }
83
84 public boolean equals(Object obj) {
85 return (obj instanceof ValueExpressionLiteral && this
86 .equals((ValueExpressionLiteral) obj));
87 }
88
89 public boolean equals(ValueExpressionLiteral ve) {
90 return (ve != null && (this.value != null && ve.value != null && (this.value == ve.value || this.value
91 .equals(ve.value))));
92 }
93
94 public int hashCode() {
95 return (this.value != null) ? this.value.hashCode() : 0;
96 }
97
98 public boolean isLiteralText() {
99 return true;
100 }
101
102 public void writeExternal(ObjectOutput out) throws IOException {
103 out.writeObject(this.value);
104 out.writeUTF((this.expectedType != null) ? this.expectedType.getName()
105 : "");
106 }
107
108 public void readExternal(ObjectInput in) throws IOException ,
109 ClassNotFoundException {
110 this.value = in.readObject();
111 String type = in.readUTF();
112 if (!"".equals(type)) {
113 this.expectedType = ReflectionUtil.forName(type);
114 }
115 }
116 }
117 |
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