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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.synthetic;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import com.amazon.carbonado.info.Direction;
/**
* Specification of a collection of properties which will participate in a key
* or index. Each property has its own direction specification.
*
* @author Brian S O'Neill
* @author Don Schneider
*/
public abstract class SyntheticPropertyList {
private List<String> mPropertyList;
SyntheticPropertyList() {
mPropertyList = new ArrayList<String>();
}
/**
* Adds a property to this index, with an unspecified direction.
*
* @param propertyName name of property to add to index
*/
public void addProperty(String propertyName) {
addProperty(propertyName, null);
}
/**
* Adds a property to this index, with the specified direction.
*
* @param propertyName name of property to add to index
* @param direction optional direction of property
*/
public void addProperty(String propertyName, Direction direction) {
if (propertyName == null) {
throw new IllegalArgumentException();
}
if (direction == null) {
direction = Direction.UNSPECIFIED;
}
if (direction != Direction.UNSPECIFIED) {
if (propertyName.length() > 0) {
if (propertyName.charAt(0) == '-' || propertyName.charAt(0) == '+') {
// Overrule the direction.
propertyName = propertyName.substring(1);
}
}
propertyName = direction.toCharacter() + propertyName;
}
mPropertyList.add(propertyName);
}
/**
* Returns the count of properties in this index.
*/
public int getPropertyCount() {
return mPropertyList.size();
}
/**
* Returns all the properties in this index, optionally prefixed with a '+'
* or '-' to indicate direction.
*/
public Iterator<String> getProperties() {
return mPropertyList.iterator();
}
}
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