fe/src/main/java/org/apache/impala/authorization/sentry/SentryAuthorizableColumn.java

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// to you under the Apache License, Version 2.0 (the
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//
//   http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.impala.authorization.sentry;

import com.google.common.base.Preconditions;
import com.google.common.base.Strings;
import com.google.common.collect.Lists;
import org.apache.impala.authorization.Authorizable;
import org.apache.sentry.core.model.db.AccessConstants;
import org.apache.sentry.core.model.db.DBModelAuthorizable;

import java.util.List;

/**
 * Class used to authorize access to a column for Sentry.
 */
public class SentryAuthorizableColumn extends SentryAuthorizable  {
  private final org.apache.sentry.core.model.db.Column column_;
  private final org.apache.sentry.core.model.db.Table table_;
  private final org.apache.sentry.core.model.db.Database database_;

  public SentryAuthorizableColumn(String dbName) {
    this(dbName, AccessConstants.ALL);
  }

  public SentryAuthorizableColumn(String dbName, String tableName) {
    this(dbName, tableName, AccessConstants.ALL);
  }

  public SentryAuthorizableColumn(String dbName, String tableName, String columnName) {
    Preconditions.checkArgument(!Strings.isNullOrEmpty(dbName));
    Preconditions.checkArgument(!Strings.isNullOrEmpty(tableName));
    Preconditions.checkArgument(!Strings.isNullOrEmpty(columnName));
    column_ = new org.apache.sentry.core.model.db.Column(columnName);
    table_ = new org.apache.sentry.core.model.db.Table(tableName);
    database_ = new org.apache.sentry.core.model.db.Database(dbName);
  }

  @Override
  public List<Authorizable> getAuthorizableHierarchy() {
    return Lists.newArrayList(new SentryAuthorizableDb(database_.getName()),
        new SentryAuthorizableTable(database_.getName(), table_.getName()), this);
  }

  @Override
  public String getName() { return database_.getName() + "." + table_.getName() + "."
      + column_.getName(); }

  @Override
  public Type getType() { return Type.COLUMN; }

  @Override
  public String getFullTableName() {
    return database_.getName() + "." + table_.getName();
  }

  @Override
  public String getDbName() { return database_.getName(); }

  @Override
  public String getTableName() { return table_.getName(); }

  @Override
  public String getColumnName() { return column_.getName(); }

  @Override
  public DBModelAuthorizable getDBModelAuthorizable() { return column_; }
}