vxquery-core/src/main/java/org/apache/vxquery/metadata/VXQueryIndexingDataSource.java

/*
* 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.vxquery.metadata;

import java.util.ArrayList;
import java.util.List;

import org.apache.hyracks.algebricks.core.algebra.base.LogicalVariable;
import org.apache.hyracks.algebricks.core.algebra.metadata.IDataSourcePropertiesProvider;
import org.apache.hyracks.algebricks.core.algebra.properties.IPhysicalPropertiesVector;
import org.apache.hyracks.algebricks.core.algebra.properties.RandomPartitioningProperty;
import org.apache.hyracks.algebricks.core.algebra.properties.StructuralPropertiesVector;
import org.apache.vxquery.compiler.rewriter.rules.CollectionFileDomain;

/**
 * Datasource object for indexing.
 */
public class VXQueryIndexingDataSource extends AbstractVXQueryDataSource {

    private String function;

    private VXQueryIndexingDataSource(int id, String collection, Object[] types, String functionCall) {
        this.dataSourceId = id;
        this.collectionName = collection;
        this.function = functionCall;
        this.collectionPartitions = collectionName.split(DELIMITER);
        this.types = types;

        final IPhysicalPropertiesVector vec = new StructuralPropertiesVector(
                new RandomPartitioningProperty(new CollectionFileDomain(collectionName)), new ArrayList<>());
        this.propProvider = new IDataSourcePropertiesProvider() {
            @Override
            public IPhysicalPropertiesVector computePropertiesVector(List<LogicalVariable> scanVariables) {
                return vec;
            }
        };
        this.tag = null;
        this.childSeq = new ArrayList<>();
        this.indexChildSeq = new ArrayList<>();
        this.indexAttsSeq = new ArrayList<>();
        this.indexValueSeq = new ArrayList<>();
        this.valueSeq = new ArrayList<>();
    }

    public static VXQueryIndexingDataSource create(int id, String collection, Object type, String function) {
        return new VXQueryIndexingDataSource(id, collection, new Object[] { type }, function);
    }

    public String getFunctionCall() {
        return function;
    }

    @Override
    public String toString() {
        return "VXQueryIndexingDataSource [collectionName=" + collectionName + ", elementPath=" + this.childSeq
                + ", searchPath=" + this.indexValueSeq + ", function=" + function + "]";
    }

    public boolean usingIndex() {
        return true;
    }

}