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  * Copyright 2015-2015 Amazon Technologies, 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:
 * This file 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.
Represents an if_not_exists(path, operand) function in building expressions. If the item does not contain an attribute at the specified path, then if_not_exists evaluates to operand; otherwise, it evaluates to path. You can use this function to avoid overwriting an attribute already present in the item.

This object is as immutable (or unmodifiable) as the underlying operand given during construction.

public final class IfNotExistsFunction<T> extends FunctionOperand {
    private final PathOperand attr;
    private final Operand operand;
    IfNotExistsFunction(PathOperand attrOperand operand) {
        this. = attr;
        this. = operand;
        return "if_not_exists(" + .asSubstituted(context) + ","
                + .asSubstituted(context) + ")";
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