Package io.crate.metadata

Source Code of io.crate.metadata.PartitionReferenceResolver

/*
* Licensed to CRATE Technology GmbH ("Crate") under one or more contributor
* license agreements.  See the NOTICE file distributed with this work for
* additional information regarding copyright ownership.  Crate 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.
*
* However, if you have executed another commercial license agreement
* with Crate these terms will supersede the license and you may use the
* software solely pursuant to the terms of the relevant commercial agreement.
*/

package io.crate.metadata;

import io.crate.operation.reference.partitioned.PartitionExpression;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class PartitionReferenceResolver implements ReferenceResolver {

    private final Map<ReferenceIdent, PartitionExpression> expressionMap = new HashMap<>();
    private final ReferenceResolver fallbackResolver;
    private final List<PartitionExpression> partitionExpressions;

    public PartitionReferenceResolver(ReferenceResolver fallbackReferenceResolver,
                                      List<PartitionExpression> partitionExpressions) {
        this.fallbackResolver = fallbackReferenceResolver;
        this.partitionExpressions = partitionExpressions;
        for (PartitionExpression partitionExpression : partitionExpressions) {
            expressionMap.put(partitionExpression.info().ident(), partitionExpression);
        }
    }

    @Override
    public ReferenceImplementation getImplementation(ReferenceIdent ident) {
        PartitionExpression expression = expressionMap.get(ident);
        assert expression != null || fallbackResolver.getImplementation(ident) == null
                : "granularity < PARTITION should have been resolved already";
        return expression;
    }

    public List<PartitionExpression> expressions() {
        return partitionExpressions;
    }
}
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