Android Open Source - JsonPullParser Int Flatten 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 w  w .  j  a v  a  2  s. com*/
 * 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 java.util.ArrayList;
import java.util.List;

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;
import static net.vvakame.util.jsonpullparser.util.JsonUtil.*;

/**
 * Converts nested integer array (in JSON form) into {@link List} of {@link Integer}s.
 * @author vvakame
 */
public class IntFlattenConverter extends TokenConverter<List<Integer>> {

  static IntFlattenConverter conv = null;


  /**
   * Returns an instance of {@link IntFlattenConverter}.<br>
   * NB: Implemented as singleton, as it has stateless nature.
   * @return {@link IntFlattenConverter}
   * @author vvakame
   */
  public static IntFlattenConverter getInstance() {
    if (conv == null) {
      conv = new IntFlattenConverter();
    }
    return conv;
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public List<Integer> 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 START_ARRAY:
        List<Integer> list = parse(parser, new ArrayList<Integer>());
        if (listener != null) {
          listener.onAdd(list);
        }
        return list;
      default:
        throw new IllegalStateException();
    }
  }

  List<Integer> parse(JsonPullParser parser, List<Integer> list) throws IOException,
      JsonFormatException {

    State state;
    while ((state = parser.lookAhead()) != State.END_ARRAY) {
      switch (state) {
        case VALUE_LONG:
          parser.getEventType();
          list.add((int) parser.getValueLong());
          break;
        case START_ARRAY:
          parser.getEventType();
          parse(parser, list);
          break;
        default:
          throw new IllegalStateException();
      }
    }
    parser.getEventType();

    return list;
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public void encodeNullToNull(Writer writer, List<Integer> obj) throws IOException {
    if (obj == null) {
      writer.write("null");
      return;
    }

    startArray(writer);

    int size = obj.size();
    for (int i = 0; i < size; i++) {
      JsonUtil.put(writer, (int) obj.get(i));
      if (i + 1 < size) {
        addSeparator(writer);
      }
    }

    endArray(writer);
  }
}

Java Source Code List

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