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/*
* Copyright 2014-2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. 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.document;
import com.amazonaws.services.dynamodbv2.document.internal.InternalUtils;
import com.amazonaws.services.dynamodbv2.model.ComparisonOperator;
/**
* Represents a condition to be compared with an attribute value.
*
* Typical usages:
*
* new Expected("strAttr").eq("attrValue");
*
* new Expected("intAttr").gt(42);
*
* ...
*
*
* See
* http://docs.aws.amazon.com/amazondynamodb/latest/APIReference/
* API_ExpectedAttributeValue.html.
*/
public class Expected {
private final String attribute;
private ComparisonOperator op;
private Object[] values;
public Expected(String attrName) {
InternalUtils.checkInvalidAttrName(attrName);
this.attribute = attrName;
}
/** Returns the attribute. */
public String getAttribute() {
return attribute;
}
public ComparisonOperator getComparisonOperator() {
return op;
}
public Object[] getValues() {
return values == null ? null : values.clone();
}
private Expected _withValues(Object ... values) {
this.values = values.clone();
return this;
}
private Expected _withComparisonOperator(ComparisonOperator op) {
this.op = op;
return this;
}
/**
* Creates and returns a condition of the range key being equal to the given
* value.
*/
public Expected eq(Object val) {
return _withComparisonOperator(ComparisonOperator.EQ)._withValues(val);
}
public Expected ne(Object val) {
return _withComparisonOperator(ComparisonOperator.NE)._withValues(val);
}
/**
* Expects the attribute be an existing attribute.
*/
public Expected exists() {
return _withComparisonOperator(ComparisonOperator.NOT_NULL);
}
/**
* Expects the attribute be non-existing.
*/
public Expected notExist() {
return _withComparisonOperator(ComparisonOperator.NULL);
}
public Expected contains(Object val) {
return _withComparisonOperator(ComparisonOperator.CONTAINS)._withValues(val);
}
public Expected notContains(Object val) {
return _withComparisonOperator(ComparisonOperator.NOT_CONTAINS)._withValues(val);
}
/**
* Creates and returns a condition of the range key with a value that begins
* with the given value.
*/
public Expected beginsWith(String val) {
return _withComparisonOperator(ComparisonOperator.BEGINS_WITH)._withValues(val);
}
public Expected in(Object ...values) {
if (values == null || values.length == 0) {
throw new IllegalArgumentException("values must not be null or empty.");
}
return _withComparisonOperator(ComparisonOperator.IN)._withValues(values);
}
/**
* Creates and returns a condition of the range key that has a value between
* the given values.
*/
public Expected between(Object low, Object hi) {
return _withComparisonOperator(ComparisonOperator.BETWEEN)._withValues(low, hi);
}
/**
* Creates and returns a condition of the range key being greater than or
* equal to the given value.
*/
public Expected ge(Object val) {
return _withComparisonOperator(ComparisonOperator.GE)._withValues(val);
}
/**
* Creates and returns a condition of the range key being greater than the
* given value.
*/
public Expected gt(Object val) {
return _withComparisonOperator(ComparisonOperator.GT)._withValues(val);
}
/**
* Creates and returns a condition of the range key being less than or equal
* to the given value.
*/
public Expected le(Object val) {
return _withComparisonOperator(ComparisonOperator.LE)._withValues(val);
}
/**
* Creates and returns a condition of the range key being less than the
* given value.
*/
public Expected lt(Object val) {
return _withComparisonOperator(ComparisonOperator.LT)._withValues(val);
}
}