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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 update action for building update expression.

This object is as immutable (or unmodifiable) as the underlying value (of type UnitOfExpression) given during construction.

public abstract class UpdateAction extends UnitOfExpression {
    private final String operator;
    private final PathOperand attribute;
    private final UnitOfExpression value;
    UpdateAction(String operatorPathOperand attributeUnitOfExpression value) {
        this. = operator;
        this. = attribute;
        this. = value;

Returns the attribute as a string, substituted if necessary with tokens using the given substitution context.
        return  == null 
             ? .asSubstituted(context)
             : .asSubstituted(context) + " " + .asSubstituted(context);
    final String getOperator() {
        return ;
    final PathOperand getPathOperand() {
        return ;
    final UnitOfExpression getValue() {
        return ;
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