com.datatorrent.lib.streamquery.index.StringCaseIndex Maven / Gradle / Ivy

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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 com.datatorrent.lib.streamquery.index;

import java.util.Map;

import javax.validation.constraints.NotNull;

/**
 * An implementation of Column Index that implements filter method using case of a string index. 
 *
 * @displayName String Case Index
 * @category Stream Manipulators
 * @tags alias
 * @since 0.3.4
 */
public class StringCaseIndex extends  ColumnIndex
{
  private boolean toUpperCase = true;
  public StringCaseIndex(@NotNull String column, String alias, boolean toLowerCase)
  {
    super(column, alias);
    toUpperCase = !toLowerCase;
  }

  @Override
  public void filter(@NotNull  Map row, @NotNull  Map collect)
  {
    if (!row.containsKey(column)) {
      return;
    }
    if (!(row.get(column) instanceof String)) {
      assert (false);
    }

    String name = getColumn();
    if (alias != null) {
      name = alias;
    }
    if (toUpperCase) {
      collect.put(name, ((String)row.get(column)).toUpperCase());
    } else {
      collect.put(name, ((String)row.get(column)).toLowerCase());
    }
  }
}