/*
* Copyright 2008 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.template.soy.data.restricted;
import com.google.template.soy.data.SoyDataException;
/**
* Undefined data.
*
* <p> Important: This class may only be used in implementing plugins (e.g. functions, directives).
*
* @author Kai Huang
*/
public class UndefinedData extends PrimitiveData {
public UndefinedData() {}
@Override public String toString() {
throw new SoyDataException("Attempted to coerce undefined value into a string.");
}
/**
* {@inheritDoc}
*
* <p> Undefined is falsy.
*/
@Override public boolean toBoolean() {
return false;
}
@Override public boolean equals(Object other) {
return other == this; // only equal if exact same UndefinedData object
}
@Override public int hashCode() {
return super.hashCode();
}
}
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