CacheUtils.java example

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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.metastore.cache;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.regex.Pattern;

import org.apache.hadoop.hive.metastore.api.Order;
import org.apache.hadoop.hive.metastore.api.Partition;
import org.apache.hadoop.hive.metastore.api.SkewedInfo;
import org.apache.hadoop.hive.metastore.api.StorageDescriptor;
import org.apache.hadoop.hive.metastore.api.Table;
import org.apache.hadoop.hive.metastore.cache.CachedStore.PartitionWrapper;
import org.apache.hadoop.hive.metastore.cache.CachedStore.TableWrapper;
import org.apache.hive.common.util.HiveStringUtils;

public class CacheUtils {
  private static final String delimit = "\u0001";

  public static String buildKey(String dbName, String tableName) {
    return dbName + delimit + tableName;
  }

  public static String buildKey(String dbName, String tableName, List<String> partVals) {
    String key = buildKey(dbName, tableName);
    if (partVals == null || partVals.size() == 0) {
      return key;
    }
    for (int i = 0; i < partVals.size(); i++) {
      key += partVals.get(i);
      if (i != partVals.size() - 1) {
        key += delimit;
      }
    }
    return key;
  }

  public static String buildKey(String dbName, String tableName, List<String> partVals, String colName) {
    String key = buildKey(dbName, tableName, partVals);
    return key + delimit + colName;
  }

  public static Table assemble(TableWrapper wrapper) {
    Table t = wrapper.getTable().deepCopy();
    if (wrapper.getSdHash()!=null) {
      StorageDescriptor sdCopy = SharedCache.getSdFromCache(wrapper.getSdHash()).deepCopy();
      if (sdCopy.getBucketCols()==null) {
        sdCopy.setBucketCols(new ArrayList<String>());
      }
      if (sdCopy.getSortCols()==null) {
        sdCopy.setSortCols(new ArrayList<Order>());
      }
      if (sdCopy.getSkewedInfo()==null) {
        sdCopy.setSkewedInfo(new SkewedInfo(new ArrayList<String>(),
            new ArrayList<List<String>>(), new HashMap<List<String>,String>()));
      }
      sdCopy.setLocation(wrapper.getLocation());
      sdCopy.setParameters(wrapper.getParameters());
      t.setSd(sdCopy);
    }
    return t;
  }

  public static Partition assemble(PartitionWrapper wrapper) {
    Partition p = wrapper.getPartition().deepCopy();
    if (wrapper.getSdHash()!=null) {
      StorageDescriptor sdCopy = SharedCache.getSdFromCache(wrapper.getSdHash()).deepCopy();
      if (sdCopy.getBucketCols()==null) {
        sdCopy.setBucketCols(new ArrayList<String>());
      }
      if (sdCopy.getSortCols()==null) {
        sdCopy.setSortCols(new ArrayList<Order>());
      }
      if (sdCopy.getSkewedInfo()==null) {
        sdCopy.setSkewedInfo(new SkewedInfo(new ArrayList<String>(),
            new ArrayList<List<String>>(), new HashMap<List<String>,String>()));
      }
      sdCopy.setLocation(wrapper.getLocation());
      sdCopy.setParameters(wrapper.getParameters());
      p.setSd(sdCopy);
    }
    return p;
  }

  public static boolean matches(String name, String pattern) {
    String[] subpatterns = pattern.trim().split("\\|");
    for (String subpattern : subpatterns) {
      subpattern = "(?i)" + subpattern.replaceAll("\\?", ".{1}").replaceAll("\\*", ".*")
          .replaceAll("\\^", "\\\\^").replaceAll("\\$", "\\\\$");
      if (Pattern.matches(subpattern, HiveStringUtils.normalizeIdentifier(name))) {
        return true;
      }
    }
    return false;
  }
}