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/*
* Copyright 2006-2012 Amazon Technologies, Inc. or its affiliates.
* Amazon, Amazon.com and Carbonado are trademarks or registered trademarks
* of Amazon Technologies, 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.
* 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 com.amazon.carbonado.capability;
import com.amazon.carbonado.info.Direction;
/**
* General information about an index defined in a {@link com.amazon.carbonado.Storage}.
*
* <p>IndexInfo instances are thread-safe and immutable.
*
* @author Brian S O'Neill
* @see IndexInfoCapability
*/
public interface IndexInfo {
/**
* Returns the name of this index, or null if not applicable.
*/
String getName();
/**
* Returns true if index entries are unique.
*/
boolean isUnique();
/**
* Returns true if index is clustered, which means it defines the physical
* ordering of storables.
*/
boolean isClustered();
/**
* Returns the properties in this index. The array might be empty, but it
* is never null. The array is a copy, and so it may be safely modified.
*/
String[] getPropertyNames();
/**
* Returns the directions of all the properties in this index. The length
* of the array matches the length returned by {@link
* #getPropertyNames}. The array is a copy, and so it may be safely
* modified.
*/
Direction[] getPropertyDirections();
}
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