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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.el;
import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import javax.el.ELContext;
import javax.el.PropertyNotWritableException;
import javax.el.ValueExpression;
import org.apache.el.util.MessageFactory;
import org.apache.el.util.ReflectionUtil;
public final class ValueExpressionLiteral extends ValueExpression implements
Externalizable {
private static final long serialVersionUID = 1L;
private Object value;
private String valueString;
private Class<?> expectedType;
public ValueExpressionLiteral() {
super();
}
public ValueExpressionLiteral(Object value, Class<?> expectedType) {
this.value = value;
this.expectedType = expectedType;
}
@Override
public Object getValue(ELContext context) {
context.notifyBeforeEvaluation(getExpressionString());
Object result;
if (this.expectedType != null) {
result = context.convertToType(this.value, this.expectedType);
} else {
result = this.value;
}
context.notifyAfterEvaluation(getExpressionString());
return result;
}
@Override
public void setValue(ELContext context, Object value) {
context.notifyBeforeEvaluation(getExpressionString());
throw new PropertyNotWritableException(MessageFactory.get(
"error.value.literal.write", this.value));
}
@Override
public boolean isReadOnly(ELContext context) {
context.notifyBeforeEvaluation(getExpressionString());
context.notifyAfterEvaluation(getExpressionString());
return true;
}
@Override
public Class<?> getType(ELContext context) {
context.notifyBeforeEvaluation(getExpressionString());
Class<?> result = (this.value != null) ? this.value.getClass() : null;
context.notifyAfterEvaluation(getExpressionString());
return result;
}
@Override
public Class<?> getExpectedType() {
return this.expectedType;
}
@Override
public String getExpressionString() {
if (this.valueString == null) {
this.valueString = (this.value != null) ? this.value.toString() : null;
}
return this.valueString;
}
@Override
public boolean equals(Object obj) {
return (obj instanceof ValueExpressionLiteral && this
.equals((ValueExpressionLiteral) obj));
}
public boolean equals(ValueExpressionLiteral ve) {
return (ve != null && (this.value != null && ve.value != null && (this.value == ve.value || this.value
.equals(ve.value))));
}
@Override
public int hashCode() {
return (this.value != null) ? this.value.hashCode() : 0;
}
@Override
public boolean isLiteralText() {
return true;
}
@Override
public void writeExternal(ObjectOutput out) throws IOException {
out.writeObject(this.value);
out.writeUTF((this.expectedType != null) ? this.expectedType.getName()
: "");
}
@Override
public void readExternal(ObjectInput in) throws IOException,
ClassNotFoundException {
this.value = in.readObject();
String type = in.readUTF();
if (!type.isEmpty()) {
this.expectedType = ReflectionUtil.forName(type);
}
}
}
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