com.cloudera.exhibit.hive.HiveStructObsDescriptor.java Source code

Introduction

Here is the source code for com.cloudera.exhibit.hive.HiveStructObsDescriptor.java

Source

/*
 * Copyright (c) 2015, Cloudera, Inc. All Rights Reserved.
 *
 * Cloudera, Inc. 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
 *
 * This software 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.cloudera.exhibit.hive;

import com.google.common.base.Function;
import com.google.common.collect.Iterators;
import com.google.common.collect.Lists;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorUtils;
import org.apache.hadoop.hive.serde2.objectinspector.StructField;
import org.apache.hadoop.hive.serde2.objectinspector.StructObjectInspector;

import java.util.Iterator;
import java.util.List;

class HiveStructObsDescriptor implements HiveObsDescriptor {
    private final StructObjectInspector obji;

    public HiveStructObsDescriptor(StructObjectInspector obji) {
        this.obji = obji;
    }

    @Override
    public Field get(int i) {
        StructField sf = obji.getAllStructFieldRefs().get(i);
        return new Field(sf.getFieldName(), HiveUtils.getFieldType(sf.getFieldObjectInspector()));
    }

    @Override
    public int indexOf(String name) {
        return obji.getAllStructFieldRefs().indexOf(obji.getStructFieldRef(name));
    }

    @Override
    public int size() {
        return obji.getAllStructFieldRefs().size();
    }

    @Override
    public Iterator<Field> iterator() {
        return Iterators.transform(obji.getAllStructFieldRefs().iterator(), new Function<StructField, Field>() {
            @Override
            public Field apply(StructField structField) {
                return new Field(structField.getFieldName(),
                        HiveUtils.getFieldType(structField.getFieldObjectInspector()));
            }
        });
    }

    @Override
    public Object[] convert(Object rawObs) {
        List v = Lists.newArrayListWithExpectedSize(obji.getAllStructFieldRefs().size());
        ObjectInspectorUtils.copyToStandardObject(v, rawObs, obji,
                ObjectInspectorUtils.ObjectInspectorCopyOption.JAVA);
        for (int i = 0; i < v.size(); i++) {
            v.set(i, HiveUtils.asJavaType(v.get(i)));
        }
        return v.toArray();
    }
}