exec/java-exec/src/main/java/org/apache/drill/exec/store/easy/json/values/StrictIntValueListener.java

/*
 * 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.drill.exec.store.easy.json.values;

import org.apache.drill.exec.store.easy.json.loader.JsonLoaderImpl;
import org.apache.drill.exec.store.easy.json.parser.TokenIterator;
import org.apache.drill.exec.vector.accessor.ScalarWriter;

import com.fasterxml.jackson.core.JsonToken;

/**
 * 32-bit integer (INT) listener with conversions only from
 * numbers and strings.
 */
public class StrictIntValueListener extends ScalarListener {

  public StrictIntValueListener(JsonLoaderImpl loader, ScalarWriter writer) {
    super(loader, writer);
  }

  @Override
  public void onValue(JsonToken token, TokenIterator tokenizer) {
    switch (token) {
      case VALUE_NULL:
        setNull();
        break;
      case VALUE_NUMBER_INT:
        addValueToListenerMap(writer.schema().name(), tokenizer.longValue());
        writer.setInt((int) tokenizer.longValue());
        break;
      case VALUE_STRING:
        try {
          writer.setInt(Integer.parseInt(tokenizer.stringValue()));
          addValueToListenerMap(writer.schema().name(), Integer.parseInt(tokenizer.stringValue()));
        } catch (NumberFormatException e) {
          throw loader.dataConversionError(schema(), "string", tokenizer.stringValue());
        }
        break;
      default:
        throw tokenizer.invalidValue(token);
    }
  }

  @Override
  protected void setArrayNull() {
    writer.setInt(0);
  }
}