Android Open Source - lightbox-android-webservices Jackson Processor

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License

The source code is released under:

Apache License

Java Source Code

/**
 * Copyright (c) 2012 Lightbox//from w ww  . j  a  v  a 2s .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 com.lightbox.android.webservices.processors;

import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Set;

import org.apache.commons.io.IOUtils;
import org.codehaus.jackson.JsonGenerationException;
import org.codehaus.jackson.JsonParseException;
import org.codehaus.jackson.map.DeserializationConfig;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.PropertyNamingStrategy;
import org.codehaus.jackson.map.ser.FilterProvider;
import org.codehaus.jackson.map.ser.impl.SimpleBeanPropertyFilter;
import org.codehaus.jackson.map.ser.impl.SimpleFilterProvider;

import android.util.Log;

/** 
 * JacksonProcessor 
 * @author Fabien Devos
 */
public class JacksonProcessor<T> implements Processor<T> {
  /** Used to tag logs */
  //@SuppressWarnings("unused")
  private static final String TAG = "JacksonProcessor";
  
  public static final String PROPERTIES_FILTER = "propertiesFilter";
  
  // Can be reused as long as it is configured first 
  private static ObjectMapper sObjectMapper = new ObjectMapper(); 
  private static ObjectMapper sObjectMapperWithoutNamingStrategy = new ObjectMapper(); 
  static {
    sObjectMapper.configure(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES, false);
    sObjectMapper.setPropertyNamingStrategy(PropertyNamingStrategy.CAMEL_CASE_TO_LOWER_CASE_WITH_UNDERSCORES);
    sObjectMapperWithoutNamingStrategy.configure(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES, false);
  }

  @Override
  public T parse(Class<T> parsedClass, InputStream source) throws ParsingException {
    return parse(parsedClass, source, true);
  }
  
  public T parse(Class<T> parsedClass, InputStream source, boolean useNamingStrategy) throws ParsingException {    
    T parsedObject = null;
    try {
      ObjectMapper objectMapper = useNamingStrategy ? sObjectMapper : sObjectMapperWithoutNamingStrategy;
      parsedObject = objectMapper.readValue(source, parsedClass);
    } catch (JsonParseException e) {
      Log.w(TAG, e);
      throw new ParsingException(e);
    } catch (JsonMappingException e) {
      Log.w(TAG, e);
      throw new ParsingException(e);
    } catch (IOException e) {
      Log.w(TAG, e);
      throw new ParsingException(e);
    }
    return parsedObject;
  }

  @Override
  public String generate(T sourceObject, Set<String> propertiesToInclude) throws GenerationException {
    return generate(sourceObject, propertiesToInclude, true);
  }
  
  public String generate(T sourceObject, Set<String> propertiesToInclude, boolean useNamingStrategy) throws GenerationException {
    String generatedString = null;
    try {
      ObjectMapper objectMapper = useNamingStrategy ? sObjectMapper : sObjectMapperWithoutNamingStrategy;
      // Filtering properties
      if (propertiesToInclude != null) {
        FilterProvider filterProvider = new SimpleFilterProvider().addFilter(PROPERTIES_FILTER,
            SimpleBeanPropertyFilter.filterOutAllExcept(propertiesToInclude));
        generatedString = objectMapper.writer(filterProvider).writeValueAsString(sourceObject);
      // Do not filter properties
      } else {
        generatedString = objectMapper.writeValueAsString(sourceObject);
      }
    } catch (JsonGenerationException e) {
      Log.w(TAG, e);
      throw new GenerationException(e);
    } catch (JsonMappingException e) {
      Log.w(TAG, e);
      throw new GenerationException(e);
    } catch (IOException e) {
      Log.w(TAG, e);
      throw new GenerationException(e);
    }
    return generatedString;
  }
  
  //----------------------------------------------
  // Utility methods
  
  @SuppressWarnings("unchecked")
  public static HashMap<String, Object> jsonToMap(String json) throws ParsingException {
    HashMap<String, Object> map = null;
    // To Map
    if (json != null) {
      @SuppressWarnings("rawtypes")
      JacksonProcessor<HashMap> processor = new JacksonProcessor<HashMap>();
      map = processor.parse(HashMap.class, IOUtils.toInputStream(json));
    }
    return map;
  }
  
  public static String mapToJson(HashMap<String, Object> map) throws GenerationException {
    String json = null;
    // To JSON
    if (map != null) {
      @SuppressWarnings("rawtypes")
      JacksonProcessor<HashMap> processor = new JacksonProcessor<HashMap>();
      json = processor.generate(map, null);
    }
    return json;
  }
  
}

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