freemarker.template.SimpleScalar Maven / Gradle / Ivy
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/*
* 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 freemarker.template;
import java.io.Serializable;
/**
* A simple implementation of the TemplateScalarModel
* interface, using a String.
* As of version 2.0 this object is immutable.
*
* This class is thread-safe.
*
* @see SimpleSequence
* @see SimpleHash
*/
public final class SimpleScalar
implements TemplateScalarModel, Serializable {
/**
* @serial the value of this SimpleScalar if it wraps a
* String.
*/
private final String value;
/**
* Constructs a SimpleScalar containing a string value.
* @param value the string value. If this is {@code null}, its value in FTL will be {@code ""}.
*/
public SimpleScalar(String value) {
this.value = value;
}
@Override
public String getAsString() {
return (value == null) ? "" : value;
}
@Override
public String toString() {
// [2.4] Shouldn't return null
return value;
}
/**
* Same as calling the constructor, except that for a {@code null} parameter it returns null.
*
* @since 2.3.23
*/
public static SimpleScalar newInstanceOrNull(String s) {
return s != null ? new SimpleScalar(s) : null;
}
}