/*
* 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.lang;
import jakarta.el.ValueExpression;
import jakarta.el.VariableMapper;
import org.apache.el.util.MessageFactory;
public class VariableMapperFactory extends VariableMapper {
private final VariableMapper target;
private VariableMapper momento;
public VariableMapperFactory(VariableMapper target) {
if (target == null) {
throw new NullPointerException(MessageFactory.get("error.noVariableMapperTarget"));
}
this.target = target;
}
public VariableMapper create() {
return this.momento;
}
@Override
public ValueExpression resolveVariable(String variable) {
ValueExpression expr = this.target.resolveVariable(variable);
if (expr != null) {
if (this.momento == null) {
this.momento = new VariableMapperImpl();
}
this.momento.setVariable(variable, expr);
}
return expr;
}
@Override
public ValueExpression setVariable(String variable, ValueExpression expression) {
throw new UnsupportedOperationException(MessageFactory.get("error.cannotSetVariables"));
}
}