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/*
* Copyright 2007-2012 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.cursor;
import java.util.IdentityHashMap;
import java.util.Map;
import com.amazon.carbonado.Storable;
import com.amazon.carbonado.filter.ExistsFilter;
import com.amazon.carbonado.filter.PropertyFilter;
import com.amazon.carbonado.filter.Visitor;
/**
* Visits a filter and maps all property filters to their zero-based ordinal
* position.
*
* @author Brian S O'Neill
*/
class PropertyOrdinalMapVisitor<S extends Storable> extends Visitor<S, Object, Object> {
private int mOrdinal;
private Map<PropertyFilter, Integer> mOrdinalMap;
PropertyOrdinalMapVisitor() {
mOrdinalMap = new IdentityHashMap<PropertyFilter, Integer>();
}
public Map<PropertyFilter, Integer> getPropertyOrdinalMap() {
return mOrdinalMap;
}
@Override
public Object visit(PropertyFilter filter, Object param) {
mOrdinalMap.put(filter, mOrdinal++);
return null;
}
@Override
public Object visit(ExistsFilter filter, Object param) {
return filter.getSubFilter().accept(this, param);
}
}
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