/**
 * Copyright 2015 IBM Corp. All Rights Reserved.
 * 
 * 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 com.ibm.watson.developer_cloud.alchemy.v1.util;

import java.io.IOException;

import com.google.gson.TypeAdapter;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonToken;
import com.google.gson.stream.JsonWriter;
import com.ibm.watson.developer_cloud.alchemy.v1.model.Taxonomy;

/**
 * The Class TaxonomyTypeAdapter.
 */
public class TaxonomyTypeAdapter extends TypeAdapter<Taxonomy> {

  /*
   * (non-Javadoc)
   * 
   * @see com.google.gson.TypeAdapter#read(com.google.gson.stream.JsonReader)
   */
  @Override
  public Taxonomy read(JsonReader reader) throws IOException {
    if (reader.peek() == JsonToken.NULL) {
      reader.nextNull();
      return null;
    }

    final Taxonomy taxonomy = new Taxonomy();
    taxonomy.setConfident(true);

    reader.beginObject();
    while (reader.hasNext()) {
      final String name = reader.nextName();

      if (name.equals("confident")) {
        final String confidentAsString = reader.nextString();
        taxonomy.setConfident(confidentAsString == null || !confidentAsString.equals("no"));
      } else if (name.equals("label")) {
        final String label = reader.nextString();
        taxonomy.setLabel(label);
      } else if (name.equals("score")) {
        final Double score = reader.nextDouble();
        taxonomy.setScore(score);
      } else {
        reader.skipValue();
      }
    }
    reader.endObject();
    return taxonomy;
  }

  /*
   * (non-Javadoc)
   * 
   * @see com.google.gson.TypeAdapter#write(com.google.gson.stream.JsonWriter, java.lang.Object)
   */
  @Override
  public void write(JsonWriter writer, Taxonomy value) throws IOException {
    if (value == null) {
      writer.nullValue();
      return;
    }

    writer.beginObject();

    if (value.getScore() != null)
      writer.name("score").value(value.getScore());
    if (value.getConfident() != null)
      writer.name("confident").value(value.getConfident());
    if (value.getLabel() != null)
      writer.name("label").value(value.getLabel());

    writer.endObject();
    writer.flush();
  }

}

/**
 * Copyright 2015 IBM Corp. All Rights Reserved.
 * 
 * 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 com.ibm.watson.developer_cloud.alchemy.v1.util;

import java.io.IOException;

import com.google.gson.TypeAdapter;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonToken;
import com.google.gson.stream.JsonWriter;
import com.ibm.watson.developer_cloud.alchemy.v1.model.Taxonomy;

/**
 * The Class TaxonomyTypeAdapter.
 */
public class TaxonomyTypeAdapter extends TypeAdapter<Taxonomy> {

  /*
   * (non-Javadoc)
   * 
   * @see com.google.gson.TypeAdapter#read(com.google.gson.stream.JsonReader)
   */
  @Override
  public Taxonomy read(JsonReader reader) throws IOException {
    if (reader.peek() == JsonToken.NULL) {
      reader.nextNull();
      return null;
    }

    final Taxonomy taxonomy = new Taxonomy();
    taxonomy.setConfident(true);

    reader.beginObject();
    while (reader.hasNext()) {
      final String name = reader.nextName();

      if (name.equals("confident")) {
        final String confidentAsString = reader.nextString();
        taxonomy.setConfident(confidentAsString == null || !confidentAsString.equals("no"));
      } else if (name.equals("label")) {
        final String label = reader.nextString();
        taxonomy.setLabel(label);
      } else if (name.equals("score")) {
        final Double score = reader.nextDouble();
        taxonomy.setScore(score);
      } else {
        reader.skipValue();
      }
    }
    reader.endObject();
    return taxonomy;
  }

  /*
   * (non-Javadoc)
   * 
   * @see com.google.gson.TypeAdapter#write(com.google.gson.stream.JsonWriter, java.lang.Object)
   */
  @Override
  public void write(JsonWriter writer, Taxonomy value) throws IOException {
    if (value == null) {
      writer.nullValue();
      return;
    }

    writer.beginObject();

    if (value.getScore() != null)
      writer.name("score").value(value.getScore());
    if (value.getConfident() == false)
      writer.name("confident").value("no");
    if (value.getLabel() != null)
      writer.name("label").value(value.getLabel());

    writer.endObject();
    writer.flush();
  }

}

Fix to have TaxonomyTypeAdapter's write() method produce output that's also accepted by its read() method. (#230)