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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:
  *
  *    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 static com.amazonaws.services.dynamodbv2.xspec.ExpressionSpecBuilder._;
Represents a condition for building condition expression.
public abstract class Condition extends UnitOfExpression {
    
Returns a new condition based on the negation of the current condition.
    public final NegationCondition negate() {
        return new NegationCondition(this);
    }

    
Returns a new condition based on the conjunction of the current condition and the given condition.

Parameters:
that given condition.
    public AndCondition and(Condition that) {
        return new AndCondition(thisthat.atomic() ? that : _(that));
    }

    
Returns a new condition based on the disjunction of the current condition and the given condition.

Parameters:
that given condition.
    public OrCondition or(Condition that) {
        return new OrCondition(thisthat.atomic() ? that : _(that));
    }

    
A condition is considered "atomic" if appending an additional AND condition would not alter the evaluation order of the original condition; false otherwise. For example, "a == b AND c == d" is atomic, but "a == b OR c == d" is not.
    abstract boolean atomic();
    
    
Returns the precedence of this condition. See http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Expressions.SpecifyingConditions.html#ConditionExpressionReference
    abstract int precedence();
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