Android Open Source - JsonPullParser String Discard Converter

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright 2011 vvakame <vvakame@gmail.com>
 */*from w ww. j  a  va2 s.  c o m*/
 * Licensed 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 net.vvakame.sample.converter;

import java.io.IOException;
import java.io.Writer;

import net.vvakame.util.jsonpullparser.JsonFormatException;
import net.vvakame.util.jsonpullparser.JsonPullParser;
import net.vvakame.util.jsonpullparser.JsonPullParser.State;
import net.vvakame.util.jsonpullparser.util.JsonUtil;
import net.vvakame.util.jsonpullparser.util.OnJsonObjectAddListener;
import net.vvakame.util.jsonpullparser.util.TokenConverter;

/**
 * Converts string (in JSON form) into {@link String}, or vice versa.
 * @author vvakame
 */
public class StringDiscardConverter extends TokenConverter<String> {

  /**
   * Returns an instance of {@link StringDiscardConverter}.
   * @return {@link StringDiscardConverter}
   * @author vvakame
   */
  public static StringDiscardConverter getInstance() {
    return new StringDiscardConverter();
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public String parse(JsonPullParser parser, OnJsonObjectAddListener listener)
      throws IOException, JsonFormatException {
    if (parser == null) {
      throw new IllegalArgumentException();
    }

    State state = parser.getEventType();

    switch (state) {
      case VALUE_NULL:
        return null;
      case VALUE_STRING:
        return parser.getValueString();
      default:
        throw new IllegalStateException();
    }
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public void encodeNullToNull(Writer writer, String obj) throws IOException {
    JsonUtil.put(writer, obj);
  }
}

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