org.apache.hadoop.hive.ql.io.StorageFormatFactory.java Source code

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Here is the source code for org.apache.hadoop.hive.ql.io.StorageFormatFactory.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.hadoop.hive.ql.io;

import java.util.HashMap;
import java.util.Map;
import java.util.ServiceLoader;

import javax.annotation.Nullable;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.google.common.collect.ImmutableMap;

public class StorageFormatFactory {
    private static final Log LOG = LogFactory.getLog(StorageFormatFactory.class);

    private final Map<String, StorageFormatDescriptor> storageFormats;

    public StorageFormatFactory() {
        Map<String, StorageFormatDescriptor> localStorageFormats = new HashMap<String, StorageFormatDescriptor>();
        for (StorageFormatDescriptor descriptor : ServiceLoader.load(StorageFormatDescriptor.class)) {
            for (String name : descriptor.getNames()) {
                name = name.trim().toUpperCase();
                StorageFormatDescriptor oldDescriptor = localStorageFormats.put(name, descriptor);
                if (oldDescriptor != null) {
                    String msg = "Storage Format Descriptor conflict at name '" + name + "', " + "the descriptor "
                            + descriptor + " is overriding " + oldDescriptor;
                    LOG.warn(msg);
                }
            }
        }
        this.storageFormats = ImmutableMap.copyOf(localStorageFormats);
    }

    public @Nullable StorageFormatDescriptor get(String name) {
        name = name.trim().toUpperCase();
        return storageFormats.get(name);
    }
}