com.amazonaws.services.dynamodbv2.xspec.UpdateAction Maven / Gradle / Ivy
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/*
* Copyright 2015-2020 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:
*
* http://aws.amazon.com/apache2.0
*
* 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.
*/
package com.amazonaws.services.dynamodbv2.xspec;
import com.amazonaws.annotation.Beta;
/**
* 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.
*/
@Beta
public abstract class UpdateAction extends UnitOfExpression {
private final String operator;
private final PathOperand attribute;
private final UnitOfExpression value;
UpdateAction(String operator, PathOperand attribute, UnitOfExpression value) {
this.operator = operator;
this.attribute = attribute;
this.value = value;
}
/**
* Returns the attribute as a string, substituted if necessary with tokens
* using the given substitution context.
*/
@Override
String asSubstituted(SubstitutionContext context) {
return value == null
? attribute.asSubstituted(context)
: attribute.asSubstituted(context) + " " + value.asSubstituted(context);
}
final String getOperator() {
return operator;
}
final PathOperand getPathOperand() {
return attribute;
}
final UnitOfExpression getValue() {
return value;
}
}