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A fork of the Apache Cassandra Project ready to embed Elasticsearch.
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License 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 org.apache.cassandra.cql3.statements;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import org.apache.cassandra.exceptions.InvalidRequestException;
import org.apache.cassandra.utils.ByteBufferUtil;
import static org.apache.commons.lang3.ArrayUtils.EMPTY_OBJECT_ARRAY;
/**
* Utility methods use to perform request validation.
*/
public final class RequestValidations
{
/**
* Checks that the specified expression is true. If not an InvalidRequestException will
* be thrown.
*
* @param expression the expression to test
* @param message the error message
* @throws InvalidRequestException if the specified expression is false.
*/
public static void checkTrue(boolean expression, String message) throws InvalidRequestException
{
checkTrue(expression, message, EMPTY_OBJECT_ARRAY);
}
/**
* Checks that the specified expression is true. If not an InvalidRequestException will
* be thrown.
*
* @param expression the expression to test
* @param messageTemplate the template used to build the error message
* @param messageArgs the message arguments
* @throws InvalidRequestException if the specified expression is false.
*/
public static void checkTrue(boolean expression,
String messageTemplate,
Object... messageArgs)
throws InvalidRequestException
{
if (!expression)
throw invalidRequest(messageTemplate, messageArgs);
}
/**
* Checks that the specified list does not contains duplicates.
*
* @param list the list to test
* @param message the error message
* @throws InvalidRequestException if the specified list contains duplicates.
*/
public static void checkContainsNoDuplicates(List list, String message) throws InvalidRequestException
{
if (new HashSet<>(list).size() != list.size())
throw invalidRequest(message);
}
/**
* Checks that the specified list contains only the specified elements.
*
* @param list the list to test
* @param expectedElements the expected elements
* @param message the error message
* @throws InvalidRequestException if the specified list contains duplicates.
*/
public static void checkContainsOnly(List list,
List expectedElements,
String message) throws InvalidRequestException
{
List copy = new ArrayList<>(list);
copy.removeAll(expectedElements);
if (!copy.isEmpty())
throw invalidRequest(message);
}
/**
* Checks that the specified expression is false. If not an InvalidRequestException will
* be thrown.
*
* @param expression the expression to test
* @param messageTemplate the template used to build the error message
* @param messageArgs the message arguments
* @throws InvalidRequestException if the specified expression is true.
*/
public static void checkFalse(boolean expression,
String messageTemplate,
Object... messageArgs)
throws InvalidRequestException
{
checkTrue(!expression, messageTemplate, messageArgs);
}
/**
* Checks that the specified expression is false. If not an InvalidRequestException will
* be thrown.
*
* @param expression the expression to test
* @param message the error message
* @throws InvalidRequestException if the specified expression is true.
*/
public static void checkFalse(boolean expression, String message) throws InvalidRequestException
{
checkTrue(!expression, message);
}
/**
* Checks that the specified object is NOT null.
* If it is an InvalidRequestException will be throws.
*
* @param object the object to test
* @param messageTemplate the template used to build the error message
* @param messageArgs the message arguments
* @return the object
* @throws InvalidRequestException if the specified object is null.
*/
public static T checkNotNull(T object, String messageTemplate, Object... messageArgs)
throws InvalidRequestException
{
checkTrue(object != null, messageTemplate, messageArgs);
return object;
}
/**
* Checks that the specified bind marker value is set to a meaningful value.
* If it is not a InvalidRequestException will be thrown.
*
* @param b the ByteBuffer to test
* @param messageTemplate the template used to build the error message
* @param messageArgs the message arguments
* @throws InvalidRequestException if the specified bind marker value is not set to a meaningful value.
*/
public static void checkBindValueSet(ByteBuffer b, String messageTemplate, Object... messageArgs)
throws InvalidRequestException
{
checkTrue(b != ByteBufferUtil.UNSET_BYTE_BUFFER, messageTemplate, messageArgs);
}
/**
* Checks that the specified object is null.
* If it is not an InvalidRequestException will be throws.
*
* @param object the object to test
* @param messageTemplate the template used to build the error message
* @param messageArgs the message arguments
* @return the object
* @throws InvalidRequestException if the specified object is not null.
*/
public static T checkNull(T object, String messageTemplate, Object... messageArgs)
throws InvalidRequestException
{
checkTrue(object == null, messageTemplate, messageArgs);
return object;
}
/**
* Checks that the specified object is null.
* If it is not an InvalidRequestException will be throws.
*
* @param object the object to test
* @param message the error message
* @return the object
* @throws InvalidRequestException if the specified object is not null.
*/
public static T checkNull(T object, String message) throws InvalidRequestException
{
return checkNull(object, message, EMPTY_OBJECT_ARRAY);
}
/**
* Returns an InvalidRequestException with the specified message.
*
* @param messageTemplate the template used to build the error message
* @param messageArgs the message arguments
* @return an InvalidRequestException with the specified message.
*/
public static InvalidRequestException invalidRequest(String messageTemplate, Object... messageArgs)
{
return new InvalidRequestException(String.format(messageTemplate, messageArgs));
}
/**
* This class must not be instantiated as it only contains static methods.
*/
private RequestValidations()
{
}
}