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