org.apache.drill.exec.store.http.HttpSubScan.java Source code

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Here is the source code for org.apache.drill.exec.store.http.HttpSubScan.java

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/**
 * 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.drill.exec.store.http;

import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;

import org.apache.drill.common.exceptions.ExecutionSetupException;
import org.apache.drill.common.expression.SchemaPath;
import org.apache.drill.common.logical.StoragePluginConfig;
import org.apache.drill.exec.physical.base.AbstractBase;
import org.apache.drill.exec.physical.base.PhysicalOperator;
import org.apache.drill.exec.physical.base.PhysicalVisitor;
import org.apache.drill.exec.physical.base.SubScan;
import org.apache.drill.exec.proto.UserBitShared.CoreOperatorType;
import org.apache.drill.exec.store.StoragePluginRegistry;

import com.fasterxml.jackson.annotation.JacksonInject;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonTypeName;
import com.google.common.base.Preconditions;

// Class containing information for reading a single HBase region
@JsonTypeName("http-region-scan")
public class HttpSubScan extends AbstractBase implements SubScan {
    static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(HttpSubScan.class);

    @JsonProperty
    public final HttpStoragePluginConfig storage;
    @JsonIgnore
    private final HttpStoragePlugin hbaseStoragePlugin;
    private final List<HttpSubScanSpec> httpSubScanSpecs;
    //TODO
    private final List<SchemaPath> columns;

    @JsonCreator
    public HttpSubScan(@JacksonInject StoragePluginRegistry registry, @JsonProperty("userName") String userName,
            @JsonProperty("storage") StoragePluginConfig storage,
            @JsonProperty("httpSubScanSpecs") LinkedList<HttpSubScanSpec> regionScanSpecList,
            @JsonProperty("columns") List<SchemaPath> columns) throws ExecutionSetupException {
        super(userName);
        hbaseStoragePlugin = (HttpStoragePlugin) registry.getPlugin(storage);
        this.httpSubScanSpecs = regionScanSpecList;
        this.storage = (HttpStoragePluginConfig) storage;
        this.columns = columns;
    }

    public HttpSubScan(HttpStoragePlugin plugin, HttpStoragePluginConfig config,
            List<HttpSubScanSpec> regionInfoList, List<SchemaPath> columns) {
        //super(userName);
        hbaseStoragePlugin = plugin;
        storage = config;
        this.httpSubScanSpecs = regionInfoList;
        this.columns = columns;
    }

    public List<HttpSubScanSpec> getHttpSubScanSpecs() {
        return httpSubScanSpecs;
    }

    @JsonIgnore
    public HttpStoragePluginConfig getStorageConfig() {
        return storage;
    }

    public List<SchemaPath> getColumns() {
        return columns;
    }

    @Override
    public boolean isExecutable() {
        return false;
    }

    @JsonIgnore
    public HttpStoragePlugin getStorageEngine() {
        return hbaseStoragePlugin;
    }

    @Override
    public <T, X, E extends Throwable> T accept(PhysicalVisitor<T, X, E> physicalVisitor, X value) throws E {
        return physicalVisitor.visitSubScan(this, value);
    }

    @Override
    public PhysicalOperator getNewWithChildren(List<PhysicalOperator> children) {
        Preconditions.checkArgument(children.isEmpty());
        return new HttpSubScan(hbaseStoragePlugin, storage, httpSubScanSpecs, columns);
    }

    @Override
    public Iterator<PhysicalOperator> iterator() {
        return Collections.emptyIterator();
    }

    @Override
    public int getOperatorType() {
        return CoreOperatorType.HBASE_SUB_SCAN_VALUE;
    }

}