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/*
* Copyright 2015-2016 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 java.util.Map;
import org.apache.http.annotation.Immutable;
import com.amazonaws.annotation.Beta;
/**
* A path operand that refers to a map attribute in DynamoDB; used for building expressions.
*
* Use {@link ExpressionSpecBuilder#M(String)} to instantiate this class.
*/
@Beta
@Immutable
public final class M extends PathOperand {
M(String attrName) {
super(attrName);
}
public ComparatorCondition eq(FunctionOperand value) {
return new ComparatorCondition("=", this, value);
}
public ComparatorCondition eq(M that) {
return new ComparatorCondition("=", this, that);
}
public ComparatorCondition ne(FunctionOperand value) {
return new ComparatorCondition("<>", this, value);
}
public ComparatorCondition ne(M that) {
return new ComparatorCondition("<>", this, that);
}
public IfNotExistsFunction ifNotExists(M defaultValue) {
return new IfNotExistsFunction(this, defaultValue);
}
/**
* Returns a SetAction object used for building update
* expression. If the attribute referred to by this path operand doesn't
* exist, the returned object represents adding the attribute value of the
* specified source path operand to an item. If the current attribute
* already exists, the returned object represents the value replacement of
* the current attribute by the attribute value of the specified source path
* operand.
*/
public SetAction set(M source) {
return new SetAction(this, source);
}
/**
* Returns a SetAction object used for building update
* expression. If the attribute referred to by this path operand doesn't
* exist, the returned object represents adding the specified value as an
* attribute to an item. If the attribute referred to by this path operand
* already exists, the returned object represents the value replacement of
* the current attribute by the specified value.
*/
public SetAction set(Map value) {
return new SetAction(this, new LiteralOperand(value));
}
/**
* Returns a SetAction object used for building update
* expression. If the attribute referred to by this path operand doesn't
* exist, the returned object represents adding the value of evaluating the
* specified IfNotExists function as an attribute to an item.
* If the attribute referred to by this path operand already exists, the
* returned object represents the value replacement of the current attribute
* by the value of evaluating the specified IfNotExists
* function.
*/
public SetAction set(IfNotExistsFunction ifNotExistsFunction) {
return new SetAction(this, ifNotExistsFunction);
}
/**
* Returns a comparator condition (that evaluates to true if the attribute value
* referred to by this path operand is equal to the specified value) for
* building condition expression.
*/
public ComparatorCondition eq(Map value) {
return new ComparatorCondition("=", this, new LiteralOperand(value));
}
/**
* Returns a comparator condition (that evaluates to true if the attribute value
* referred to by this path operand is not equal to that of the specified
* path operand) for building condition expression.
*/
public ComparatorCondition ne(Map value) {
return new ComparatorCondition("<>", this, new LiteralOperand(value));
}
/**
* Returns an IfNotExists object which represents an if_not_exists(path, operand) function call where path refers to that
* of the current path operand; used for building expressions.
*
*
* "if_not_exists (path, operand) – 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."
*
*
* @param defaultValue
* the default value that will be used as the operand to the
* if_not_exists function call.
*/
public IfNotExistsFunction ifNotExists(Map defaultValue) {
return new IfNotExistsFunction(this, new LiteralOperand(defaultValue));
}
}