diff options
Diffstat (limited to 'src/main/java/com/google/escapevelocity/ConstantExpressionNode.java')
-rw-r--r-- | src/main/java/com/google/escapevelocity/ConstantExpressionNode.java | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/src/main/java/com/google/escapevelocity/ConstantExpressionNode.java b/src/main/java/com/google/escapevelocity/ConstantExpressionNode.java new file mode 100644 index 0000000..a4dfe17 --- /dev/null +++ b/src/main/java/com/google/escapevelocity/ConstantExpressionNode.java @@ -0,0 +1,41 @@ +/* + * Copyright (C) 2015 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; + } +} |