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/*
* Copyright (C) 2018 Google, Inc.
*
* Licensed 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 com.google.escapevelocity;
/**
* A node in the parse tree representing a constant value. Evaluating the node yields the constant
* value. Instances of this class are used both in expressions, like the {@code 23} in
* {@code #set ($x = 23)}, and for literal text in templates. In the template...
* <pre>{@code
* abc#{if}($x == 5)def#{end}xyz
* }</pre>
* ...each of the strings {@code abc}, {@code def}, {@code xyz} is represented by an instance of
* this class that {@linkplain #evaluate evaluates} to that string, and the value {@code 5} is
* represented by an instance of this class that evaluates to the integer 5.
*
* @author emcmanus@google.com (Éamonn McManus)
*/
class ConstantExpressionNode extends ExpressionNode {
private final Object value;
ConstantExpressionNode(String resourceName, int lineNumber, Object value) {
super(resourceName, lineNumber);
this.value = value;
}
@Override
Object evaluate(EvaluationContext context) {
return value;
}
}
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