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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.LinkedList;
import java.util.List;
import org.apache.http.annotation.Immutable;
import com.amazonaws.annotation.Beta;
/**
* A path operand that refers to a number attribute in DynamoDB; used for building expressions.
*
* Use {@link ExpressionSpecBuilder#N(String)} to instantiate this class.
*/
@Beta
@Immutable
public final class N extends PathOperand {
N(String path) { super(path); }
/**
* Returns a comparator condition (that evaluates to true if the value of the current
* attribute is equal to that of the specified attribute) for building
* condition expression.
*/
public ComparatorCondition eq(N that) {
return new ComparatorCondition("=", this, that);
}
/**
* Returns a comparator condition (that evaluates to true if the value of the current
* attribute is not equal to that of the specified attribute) for building
* condition expression.
*/
public ComparatorCondition ne(N that) {
return new ComparatorCondition("<>", this, that);
}
/**
* Returns a comparator condition (that evaluates to true if the value of the current
* attribute is less than or equal to the specified value) for building
* condition expression.
*/
public ComparatorCondition le(Number value) {
return new ComparatorCondition("<=", this, new LiteralOperand(value));
}
/**
* Returns a comparator condition (that evaluates to true if the value of the current
* attribute is less than or equal to that of the specified attribute) for building
* condition expression.
*/
public ComparatorCondition le(N that) {
return new ComparatorCondition("<=", this, that);
}
/**
* Returns a comparator condition (that evaluates to true if the value of the current
* attribute is less than the specified value) for building
* condition expression.
*/
public ComparatorCondition lt(Number value) {
return new ComparatorCondition("<", this, new LiteralOperand(value));
}
/**
* Returns a comparator condition (that evaluates to true if the value of the current
* attribute is less than that of the specified attribute) for building
* condition expression.
*/
public ComparatorCondition lt(N that) {
return new ComparatorCondition("<", this, that);
}
/**
* Returns a comparator condition (that evaluates to true if the value of the current
* attribute is greater than or equal to the specified value) for building
* condition expression.
*/
public ComparatorCondition ge(Number value) {
return new ComparatorCondition(">=", this, new LiteralOperand(value));
}
/**
* Returns a comparator condition (that evaluates to true if the value of the current
* attribute is greater than or equal to that of the specified attribute) for building
* condition expression.
*/
public ComparatorCondition ge(N that) {
return new ComparatorCondition(">=", this, that);
}
/**
* Returns a comparator condition (that evaluates to true if the value of the current
* attribute is greater than the specified value) for building
* condition expression.
*/
public ComparatorCondition gt(Number value) {
return new ComparatorCondition(">", this, new LiteralOperand(value));
}
/**
* Returns a comparator condition (that evaluates to true if the value of the current
* attribute is greater than that of the specified attribute) for building
* condition expression.
*/
public ComparatorCondition gt(N that) {
return new ComparatorCondition(">", this, that);
}
/**
* Returns a BetweenCondition that represents a BETWEEN comparison (that evaluates to true if the value of the
* current attribute is greater than or equal to the given low value, and
* less than or equal to the given high value) for building condition
* expression.
*/
public BetweenCondition between(Number low, Number high) {
return new BetweenCondition(this,
new LiteralOperand(low),
new LiteralOperand(high));
}
/**
* Returns an AddAction for build expression that would add the
* given value mathematically to the existing attribute; or if the attribute
* does not already exist, add the new attribute and the value to the item.
*
* In general, DynamoDB recommends using SET rather than ADD.
*/
public AddAction add(Number value) {
return new AddAction(this, new LiteralOperand(value));
}
// Binary operation on a number
/**
* Returns a PlusOperation that represents the addition of the
* given value to that of the current attribute; used for building update
* expression.
*
* @param value
* given value to be added to the value of the current attribute.
*/
public PlusOperation plus(Number value) {
return new PlusOperation(this, new LiteralOperand(value));
}
/**
* Returns a PlusOperation object that represents the addition of the
* value of the given attribute to that of the current attribute; used for
* building update expression.
*
* @param attr
* given attribute whose value is to be added to that of the
* current attribute
*/
public PlusOperation plus(N attr) {
return new PlusOperation(this, attr);
}
/**
* Returns a MinusOperation object that represents the subtraction of
* the given value from that of the current attribute; used for building
* update expression.
*
* @param value
* given value to be subtracted from the value of the current
* attribute.
*/
public MinusOperation minus(Number value) {
return new MinusOperation(this, new LiteralOperand(value));
}
/**
* Returns a MinusOperation object that represents the subtraction of
* the value of the given attribute from that of the current attribute; used
* for building update expression.
*
* @param attr
* given attribute whose value is to be subtracted from that of
* the current attribute
*/
public MinusOperation minus(N attr) {
return new MinusOperation(this, attr);
}
// SET binary operation
/**
* Returns a SetAction object used for building update
* expression with the specified PlusOperation. If the current
* attribute doesn't exist, the returned object represents adding the result
* of the specified plus ('+') binary operation as an attribute to an item.
* If this attribute already exists, the returned object represents the
* value replacement of the current attribute by the result of the specified
* plus ('+') binary operation.
*/
public final SetAction set(PlusOperation plusOperation) {
return new SetAction(this, plusOperation);
}
/**
* Returns a SetAction object used for building update
* expression with the specified MinusOperation. If the current
* attribute doesn't exist, the returned object represents adding the result
* of the specified minus ('-') binary operation as an attribute to an item.
* If this attribute already exists, the returned object represents the
* value replacement of the current attribute by the result of the specified
* minus ('-') binary operation.
*/
public final SetAction set(MinusOperation minusOperation) {
return new SetAction(this, minusOperation);
}
/**
* Returns an InCondition (that evaluates to true if the value of the current
* attribute is equal to any of the specified values) for building condition
* expression.
*
* @param values
* specified values. The number of values must be at least one
* and at most 100.
*/
public final InCondition in(Number... values) {
List list = new LinkedList();
for (Number v: values)
list.add(new LiteralOperand(v));
return new InCondition(this, list);
}
/**
* Returns an InCondition (that evaluates to true if the value of the current
* attribute is equal to any of the values in the specified list) for
* building condition expression.
*
* @param values
* specified list of values. The number of values must be at
* least one and at most 100.
*/
public final InCondition in(List values) {
List list = new LinkedList();
for (Number v: values)
list.add(new LiteralOperand(v));
return new InCondition(this, list);
}
/**
* 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(N 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(Number 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(Number 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(Number 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(Number defaultValue) {
return new IfNotExistsFunction(this, new LiteralOperand(defaultValue));
}
/**
* Returns an IfNotExists object which represents an if_not_exists(path, operand) function call where path refers to that
* of the current attribute; 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(N defaultValue) {
return ExpressionSpecBuilder.if_not_exists(this, defaultValue);
}
}