56 lines
1.9 KiB
Java
56 lines
1.9 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.lang;
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import javax.el.ValueExpression;
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import javax.el.VariableMapper;
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public class VariableMapperFactory extends VariableMapper {
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private final VariableMapper target;
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private VariableMapper momento;
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public VariableMapperFactory(VariableMapper target) {
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if (target == null) {
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throw new NullPointerException("Target VariableMapper cannot be null");
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}
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this.target = target;
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}
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public VariableMapper create() {
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return this.momento;
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}
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@Override
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public ValueExpression resolveVariable(String variable) {
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ValueExpression expr = this.target.resolveVariable(variable);
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if (expr != null) {
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if (this.momento == null) {
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this.momento = new VariableMapperImpl();
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}
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this.momento.setVariable(variable, expr);
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}
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return expr;
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}
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@Override
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public ValueExpression setVariable(String variable, ValueExpression expression) {
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throw new UnsupportedOperationException("Cannot Set Variables on Factory");
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}
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}
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