Coverage Report

 /*
  * 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.johnzon.mapper;
 
 import static java.util.Arrays.asList;
 
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.io.OutputStreamWriter;
 import java.io.Reader;
 import java.io.StringWriter;
 import java.io.Writer;
 import java.lang.reflect.Array;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.ParameterizedType;
 import java.lang.reflect.Type;
 import java.math.BigDecimal;
 import java.math.BigInteger;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Comparator;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Queue;
 import java.util.Set;
 import java.util.SortedMap;
 import java.util.SortedSet;
 import java.util.TreeMap;
 import java.util.TreeSet;
 import java.util.concurrent.ArrayBlockingQueue;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
 
 import javax.json.JsonArray;
 import javax.json.JsonNumber;
 import javax.json.JsonObject;
 import javax.json.JsonReader;
 import javax.json.JsonReaderFactory;
 import javax.json.JsonString;
 import javax.json.JsonValue;
 import javax.json.JsonValue.ValueType;
 import javax.json.stream.JsonGenerator;
 import javax.json.stream.JsonGeneratorFactory;
 import javax.xml.bind.DatatypeConverter;
 
 import org.apache.johnzon.mapper.access.AccessMode;
 import org.apache.johnzon.mapper.converter.EnumConverter;
 import org.apache.johnzon.mapper.reflection.JohnzonCollectionType;
 import org.apache.johnzon.mapper.reflection.JohnzonParameterizedType;
 import org.apache.johnzon.mapper.reflection.Mappings;
 
 public class Mapper {
     private static final Converter<Object> FALLBACK_CONVERTER = new FallbackConverter();
     private static final JohnzonParameterizedType ANY_LIST = new JohnzonParameterizedType(List.class, Object.class);
 
     protected final Mappings mappings;
     protected final JsonReaderFactory readerFactory;
     protected final JsonGeneratorFactory generatorFactory;
     protected final boolean close;
     protected final ConcurrentMap<Type, Converter<?>> converters;
     protected final int version;
     //private final boolean hiddenConstructorSupported;
     //private final AccessMode accessMode;
     protected boolean skipNull;
     protected boolean skipEmptyArray;
     protected boolean treatByteArrayAsBase64;
 
     public Mapper(final JsonReaderFactory readerFactory, final JsonGeneratorFactory generatorFactory,
                   final boolean doClose, final Map<Class<?>, Converter<?>> converters,
                   final int version, final Comparator<String> attributeOrder, boolean skipNull, boolean skipEmptyArray,
                   final AccessMode accessMode, final boolean hiddenConstructorSupported, boolean treatByteArrayAsBase64) {
         this.readerFactory = readerFactory;
         this.generatorFactory = generatorFactory;
         this.close = doClose;
         this.converters = new ConcurrentHashMap<Type, Converter<?>>(converters);
         this.version = version;
         this.mappings = new Mappings(attributeOrder, accessMode, hiddenConstructorSupported);
         this.skipNull = skipNull;
         this.skipEmptyArray = skipEmptyArray;
         //this.accessMode = accessMode;
         //this.hiddenConstructorSupported = hiddenConstructorSupported;
         this.treatByteArrayAsBase64 = treatByteArrayAsBase64;
     }
 
     private static JsonGenerator writePrimitives(final JsonGenerator generator, final Object value) {
         if (value == null) {
             return null; // fake a write
         }
 
         final Class<?> type = value.getClass();
         if (type == String.class) {
             return generator.write(value.toString());
         } else if (type == long.class || type == Long.class) {
             return generator.write(Long.class.cast(value).longValue());
         } else if (isInt(type)) {
             return generator.write(Number.class.cast(value).intValue());
         } else if (isFloat(type)) {
             final double doubleValue = Number.class.cast(value).doubleValue();
             if (Double.isNaN(doubleValue)) {
                 return generator;
             }
             return generator.write(doubleValue);
         } else if (type == boolean.class || type == Boolean.class) {
             return generator.write(Boolean.class.cast(value));
         } else if (type == BigDecimal.class) {
             return generator.write(BigDecimal.class.cast(value));
         } else if (type == BigInteger.class) {
             return generator.write(BigInteger.class.cast(value));
         } else if (type == char.class || type == Character.class) {
             return generator.write(Character.class.cast(value).toString());
         }
         return null;
     }
 
     private static JsonGenerator writePrimitives(final JsonGenerator generator, final String key, final Class<?> type, final Object value) {
         if (type == String.class) {
             return generator.write(key, value.toString());
         } else if (type == long.class || type == Long.class) {
             return generator.write(key, Long.class.cast(value).longValue());
         } else if (isInt(type)) {
             return generator.write(key, Number.class.cast(value).intValue());
         } else if (isFloat(type)) {
             final double doubleValue = Number.class.cast(value).doubleValue();
             if (Double.isNaN(doubleValue)) {
                 return generator;
             }
             return generator.write(key, doubleValue);
         } else if (type == boolean.class || type == Boolean.class) {
             return generator.write(key, Boolean.class.cast(value));
         } else if (type == BigDecimal.class) {
             return generator.write(key, BigDecimal.class.cast(value));
         } else if (type == BigInteger.class) {
             return generator.write(key, BigInteger.class.cast(value));
         } else if (type == char.class || type == Character.class) {
             return generator.write(key, Character.class.cast(value).toString());
         }
         return generator;
     }
 
     private static boolean isInt(final Class<?> type) {
         return type == int.class || type == Integer.class
                 || type == byte.class || type == Byte.class
                 || type == short.class || type == Short.class;
     }
 
     private static boolean isFloat(final Class<?> type) {
         return type == double.class || type == Double.class
                 || type == float.class || type == Float.class;
     }
 
     /*private <T> String convertFrom(final Class<T> aClass, final T value) {
         final Converter<T> converter = (Converter<T>) findConverter(aClass);
         return doConverFrom(value, converter);
     }*/
 
     private static <T> String doConverFrom(final T value, final Converter<T> converter) {
         if (converter == null) {
             throw new MapperException("can't convert " + value + " to String");
         }
         return converter.toString(value);
     }
 
     private <T> Converter<T> findConverter(final Type aClass) {
         final Converter<T> converter = (Converter<T>) converters.get(aClass);
         if (converter != null) {
             return converter;
         }
         if (Class.class.isInstance(aClass)) {
             final Class<?> clazz = Class.class.cast(aClass);
             if (clazz.isEnum()) {
                 final Converter<T> enumConverter = new EnumConverter(clazz);
                 converters.putIfAbsent(clazz, enumConverter);
                 return enumConverter;
             }
         }
         return null;
     }
 
     private Object convertTo(final Type aClass, final String text) {
         if (Object.class == aClass) {
             return text;
         }
         final Converter<?> converter = findConverter(aClass);
         if (converter == null) {
             converters.putIfAbsent(aClass, FALLBACK_CONVERTER);
             return FALLBACK_CONVERTER;
         }
         return converter.fromString(text);
     }
 
     public <T> void writeArray(final Object object, final OutputStream stream) {
         writeArray(asList((T[]) object), stream);
     }
 
     public <T> void writeArray(final T[] object, final OutputStream stream) {
         writeArray(asList(object), stream);
     }
 
     public <T> void writeArray(final T[] object, final Writer stream) {
         writeArray(asList(object), stream);
     }
 
     public <T> void writeArray(final Collection<T> object, final OutputStream stream) {
         writeArray(object, new OutputStreamWriter(stream));
     }
 
     public <T> void writeArray(final Collection<T> object, final Writer stream) {
         JsonGenerator generator = generatorFactory.createGenerator(stream);
         try {
             generator = doWriteArray(object, generator);
         } finally {
             doCloseOrFlush(generator);
         }
     }
 
     private <T> JsonGenerator doWriteArray(final Collection<T> object, final JsonGenerator inGenerator) {
         JsonGenerator generator = inGenerator;
         if (object == null) {
             generator = generator.writeStartArray().writeEnd();
         } else {
             generator = generator.writeStartArray();
             for (final T t : object) {
                 generator = writeItem(generator, t);
             }
             generator = generator.writeEnd();
         }
         return generator;
     }
 
     private void doCloseOrFlush(final JsonGenerator generator) {
         if (close) {
             generator.close();
         } else {
             generator.flush();
         }
     }
 
     public <T> void writeIterable(final Iterable<T> object, final OutputStream stream) {
         writeIterable(object, new OutputStreamWriter(stream));
     }
 
     public <T> void writeIterable(final Iterable<T> object, final Writer stream) {
         JsonGenerator generator = generatorFactory.createGenerator(stream);
         try {
             if (object == null) {
                 generator = generator.writeStartArray().writeEnd();
             } else {
                 generator.writeStartArray();
                 for (final T t : object) {
                     generator = writeItem(generator, t);
                 }
                 generator.writeEnd();
             }
         } finally {
             doCloseOrFlush(generator);
         }
     }
 
     public void writeObject(final Object object, final Writer stream) {
         final JsonGenerator generator = generatorFactory.createGenerator(stream);
         doWriteHandlingNullObject(object, generator);
     }
 
     public void writeObject(final Object object, final OutputStream stream) {
         final JsonGenerator generator = generatorFactory.createGenerator(stream);
         doWriteHandlingNullObject(object, generator);
     }
 
     public String writeObjectAsString(final Object instance) {
         final StringWriter writer = new StringWriter();
         writeObject(instance, writer);
         return writer.toString();
     }
 
     private void doWriteHandlingNullObject(final Object object, final JsonGenerator generator) {
         if (object == null) {
             generator.writeStartObject().writeEnd().close();
             return;
         }
 
         //JsonGenerator gen = null;
         try {
             /*gen = */
             doWriteObject(generator, object);
         } finally {
             doCloseOrFlush(generator);
         }
     }
 
     private JsonGenerator doWriteObject(final JsonGenerator generator, final Object object) {
         try {
             JsonGenerator gen = generator;
             if (object == null) {
                 return generator;
             }
 
             if (Map.class.isInstance(object)) {
                 gen = gen.writeStartObject();
                 gen = writeMapBody((Map<?, ?>) object, gen);
                 gen = gen.writeEnd();
                 return gen;
             }
 
             gen = gen.writeStartObject();
             gen = doWriteObjectBody(gen, object);
             return gen.writeEnd();
         } catch (final InvocationTargetException e) {
             throw new MapperException(e);
         } catch (final IllegalAccessException e) {
             throw new MapperException(e);
         }
     }
 
     private JsonGenerator doWriteObjectBody(final JsonGenerator gen, final Object object) throws IllegalAccessException, InvocationTargetException {
         final Class<?> objectClass = object.getClass();
         final Mappings.ClassMapping classMapping = mappings.findOrCreateClassMapping(objectClass);
         if (classMapping == null) {
             throw new MapperException("No mapping for " + objectClass.getName());
         }
 
         JsonGenerator generator = gen;
         for (final Map.Entry<String, Mappings.Getter> getterEntry : classMapping.getters.entrySet()) {
             final Mappings.Getter getter = getterEntry.getValue();
             final Object value = getter.reader.read(object);
             if (getter.version >= 0 && version >= getter.version) {
                 continue;
             }
 
             if (value == null) {
                 if (skipNull) {
                     continue;
                 } else {
                     gen.writeNull(getterEntry.getKey());
                     continue;
                 }
             }
 
             generator = writeValue(generator, value.getClass(),
                     getter.primitive, getter.array,
                     getter.collection, getter.map,
                     getterEntry.getKey(),
                     getter.converter == null ? value : getter.converter.toString(value));
         }
         return generator;
     }
 
     private JsonGenerator writeMapBody(final Map<?, ?> object, final JsonGenerator gen) throws InvocationTargetException, IllegalAccessException {
         JsonGenerator generator = gen;
         for (final Map.Entry<?, ?> entry : ((Map<?, ?>) object).entrySet()) {
             final Object value = entry.getValue();
             final Object key = entry.getKey();
 
             if (value == null) {
                 if (skipNull) {
                     continue;
                 } else {
                     gen.writeNull(key == null ? "null" : key.toString());
                     continue;
                 }
             }
 
             final Class<?> valueClass = value.getClass();
             final boolean primitive = Mappings.isPrimitive(valueClass);
             final boolean clazz = mappings.getClassMapping(valueClass) != null;
             final boolean array = clazz || primitive ? false : valueClass.isArray();
             final boolean collection = clazz || primitive || array ? false : Collection.class.isAssignableFrom(valueClass);
             final boolean map = clazz || primitive || array || collection ? false : Map.class.isAssignableFrom(valueClass);
             generator = writeValue(generator, valueClass,
                     primitive, array, collection, map,
                     key == null ? "null" : key.toString(), value);
         }
         return generator;
     }
 
     private JsonGenerator writeValue(final JsonGenerator generator, final Class<?> type,
                                      final boolean primitive, final boolean array,
                                      final boolean collection, final boolean map,
                                      final String key, final Object value) throws InvocationTargetException, IllegalAccessException {
         if (array) {
             final int length = Array.getLength(value);
             if (length == 0 && skipEmptyArray) {
                 return generator;
             }
             
             if(treatByteArrayAsBase64 && (type == byte[].class /*|| type == Byte[].class*/)) {
                 String base64EncodedByteArray = DatatypeConverter.printBase64Binary((byte[]) value);
                 generator.write(key, base64EncodedByteArray);
                 return generator;
             }
 
             JsonGenerator gen = generator.writeStartArray(key);
             for (int i = 0; i < length; i++) {
                 gen = writeItem(gen, Array.get(value, i));
             }
             return gen.writeEnd();
         } else if (collection) {
             JsonGenerator gen = generator.writeStartArray(key);
             for (final Object o : Collection.class.cast(value)) {
                 gen = writeItem(gen, o);
             }
             return gen.writeEnd();
         } else if (map) {
             JsonGenerator gen = generator.writeStartObject(key);
             gen = writeMapBody((Map<?, ?>) value, gen);
             return gen.writeEnd();
         } else if (primitive) {
             return writePrimitives(generator, key, type, value);
         } else {
             final Converter<?> converter = findConverter(type);
             if (converter != null) {
                 return writeValue(generator, String.class, true, false, false, false, key,
                         doConverFrom(value, (Converter<Object>) converter));
             }
             return doWriteObjectBody(generator.writeStartObject(key), value).writeEnd();
         }
     }
 
     private JsonGenerator writeItem(final JsonGenerator generator, final Object o) {
         JsonGenerator newGen = writePrimitives(generator, o);
         if (newGen == null) {
             if (Collection.class.isInstance(o)) {
                 newGen = doWriteArray(Collection.class.cast(o), generator);
             } else if (o != null && o.getClass().isArray()) {
                 final int length = Array.getLength(o);
                 if (length > 0 || !skipEmptyArray) {
                     newGen = generator.writeStartArray();
                     for (int i = 0; i < length; i++) {
                         newGen = writeItem(newGen, Array.get(o, i));
                     }
                     newGen = newGen.writeEnd();
                 }
             } else {
                 newGen = doWriteObject(generator, o);
             }
         }
         return newGen;
     }
 
     public <T> T readObject(final Reader stream, final Type clazz) {
         final JsonReader reader = readerFactory.createReader(stream);
         return mapObject(clazz, reader);
     }
 
     public <T> T readObject(final InputStream stream, final Type clazz) {
         final JsonReader reader = readerFactory.createReader(stream);
         return mapObject(clazz, reader);
     }
 
     private <T> T mapObject(final Type clazz, final JsonReader reader) {
         try {
             return (T) buildObject(clazz, reader.readObject());
         } catch (final Exception e) {
             throw new MapperException(e);
         } finally {
             if (close) {
                 reader.close();
             }
         }
     }
 
     public <T> Collection<T> readCollection(final InputStream stream, final ParameterizedType genericType) {
         final JsonReader reader = readerFactory.createReader(stream);
         final Mappings.CollectionMapping mapping = mappings.findCollectionMapping(genericType);
         if (mapping == null) {
             throw new UnsupportedOperationException("type " + genericType + " not supported");
         }
         try {
             return mapCollection(mapping, reader.readArray());
         } catch (final Exception e) {
             throw new MapperException(e);
         } finally {
             if (close) {
                 reader.close();
             }
         }
     }
 
     public <T> T readJohnzonCollection(final InputStream stream, final JohnzonCollectionType<T> genericType) {
         return (T) readCollection(stream, genericType);
     }
 
     public <T> T readJohnzonCollection(final Reader stream, final JohnzonCollectionType<T> genericType) {
         return (T) readCollection(stream, genericType);
     }
 
     public <T> Collection<T> readCollection(final Reader stream, final ParameterizedType genericType) {
         final JsonReader reader = readerFactory.createReader(stream);
         final Mappings.CollectionMapping mapping = mappings.findCollectionMapping(genericType);
         if (mapping == null) {
             throw new UnsupportedOperationException("type " + genericType + " not supported");
         }
         try {
             return mapCollection(mapping, reader.readArray());
         } catch (final Exception e) {
             throw new MapperException(e);
         } finally {
             if (close) {
                 reader.close();
             }
         }
     }
 
     public <T> T[] readArray(final Reader stream, final Class<T> clazz) {
         final JsonReader reader = readerFactory.createReader(stream);
         return mapArray(clazz, reader);
     }
 
     public <T> T[] readArray(final InputStream stream, final Class<T> clazz) {
         final JsonReader reader = readerFactory.createReader(stream);
         return mapArray(clazz, reader);
     }
 
     private <T> T[] mapArray(final Class<T> clazz, final JsonReader reader) {
         try {
             return (T[]) buildArrayWithComponentType(reader.readArray(), clazz);
         } catch (final Exception e) {
             throw new MapperException(e);
         } finally {
             if (close) {
                 reader.close();
             }
         }
     }
 
     private Object buildObject(final Type inType, final JsonObject object) throws Exception {
         Type type = inType;
         if (inType == Object.class) {
             type = new JohnzonParameterizedType(Map.class, String.class, Object.class);
         }
 
         final Mappings.ClassMapping classMapping = mappings.findOrCreateClassMapping(type);
 
         if (classMapping == null) {
             if (ParameterizedType.class.isInstance(type)) {
                 final ParameterizedType aType = ParameterizedType.class.cast(type);
                 final Type[] fieldArgTypes = aType.getActualTypeArguments();
                 if (fieldArgTypes.length >= 2) {
                     final Class<?> raw = Class.class.cast(aType.getRawType());
 
                     final Map map;
                     if (SortedMap.class.isAssignableFrom(raw)) {
                         map = new TreeMap();
                     } else if (ConcurrentMap.class.isAssignableFrom(raw)) {
                         map = new ConcurrentHashMap(object.size());
                     } else if (Map.class.isAssignableFrom(raw)) {
                         map = new HashMap(object.size());
                     } else {
                         map = null;
                     }
 
                     if (map != null) {
 
                         Type keyType;
                         if (ParameterizedType.class.isInstance(fieldArgTypes[0])) {
                             keyType = fieldArgTypes[0];
                         } else {
                             keyType = fieldArgTypes[0];
                         }
 
                         for (final Map.Entry<String, JsonValue> value : object.entrySet()) {
                             map.put(convertTo(keyType, value.getKey()), toObject(value.getValue(), fieldArgTypes[1]));
                         }
                         return map;
                     }
                 }
             }
         }
         if (classMapping == null) {
             throw new MapperException("Can't map " + type);
         }
 
         if (classMapping.constructor == null) {
             throw new IllegalArgumentException(classMapping.clazz.getName() + " can't be instantiated by Johnzon, this is a write only class");
         }
 
         final Object t = classMapping.constructor.newInstance();
         for (final Map.Entry<String, Mappings.Setter> setter : classMapping.setters.entrySet()) {
             final JsonValue jsonValue = object.get(setter.getKey());
             final Mappings.Setter value = setter.getValue();
             final AccessMode.Writer setterMethod = value.writer;
             final Object convertedValue = value.converter == null ?
                     toObject(jsonValue, value.paramType) : jsonValue.getValueType() == ValueType.STRING ?
                     value.converter.fromString(JsonString.class.cast(jsonValue).getString()) :
                     value.converter.fromString(jsonValue.toString());
 
             if (convertedValue != null) {
                 setterMethod.write(t, convertedValue);
             }
         }
 
         return t;
     }
 
     private Object toObject(final JsonValue jsonValue, final Type type) throws Exception {
         if (jsonValue == null || jsonValue == JsonValue.NULL) {
             return null;
         }
 
         if (type == Boolean.class || type == boolean.class) {
             if (jsonValue == JsonValue.TRUE) {
                 return true;
             }
             if (jsonValue == JsonValue.FALSE) {
                 return false;
             }
             throw new MapperException("Unable to parse " + jsonValue + " to boolean");
         }
 
         if(treatByteArrayAsBase64 && jsonValue.getValueType() == ValueType.STRING && (type == byte[].class /*|| type == Byte[].class*/)) {
             return DatatypeConverter.parseBase64Binary(((JsonString)jsonValue).getString());
         }
 
         if (Object.class == type) { // handling specific types here to keep exception in standard handling
             if (jsonValue == JsonValue.TRUE) {
                 return true;
             }
             if (jsonValue == JsonValue.FALSE) {
                 return false;
             }
             if (JsonNumber.class.isInstance(jsonValue)) {
                 final JsonNumber jsonNumber = JsonNumber.class.cast(jsonValue);
                 if(jsonNumber.isIntegral()) {
                     return jsonNumber.intValue();
                 }
                 return jsonNumber.doubleValue();
             }
         }
 
         if (type == Character.class || type == char.class) {
             return convertTo(Class.class.cast(type), (JsonString.class.cast(jsonValue).getString()));
         }
 
         if (JsonObject.class.isInstance(jsonValue)) {
             return buildObject(type, JsonObject.class.cast(jsonValue));
         } else if (JsonArray.class.isInstance(jsonValue)) {
             return buildArray(type, JsonArray.class.cast(jsonValue));
         } else if (JsonNumber.class.isInstance(jsonValue)) {
 
             final JsonNumber number = JsonNumber.class.cast(jsonValue);
 
             if (type == Integer.class || type == int.class) {
                 return number.intValue();
             }
 
             if (type == Long.class || type == long.class) {
                 return number.longValue();
             }
 
             if (type == Short.class || type == short.class) {
                 return (short) number.intValue();
             }
 
             if (type == Byte.class || type == byte.class) {
                 return (byte) number.intValue();
             }
 
             if (type == Float.class || type == float.class) {
                 return (float) number.doubleValue();
             }
 
             if (type == Double.class || type == double.class) {
                 return number.doubleValue();
             }
 
             if (type == BigInteger.class) {
                 return number.bigIntegerValue();
             }
 
             if (type == BigDecimal.class) {
                 return number.bigDecimalValue();
             }
         } else if (JsonString.class.isInstance(jsonValue) || Object.class == type) {
             return convertTo(Class.class.cast(type), JsonString.class.cast(jsonValue).getString());
         }
 
         throw new MapperException("Unable to parse " + jsonValue + " to " + type);
     }
 
     private Object buildArray(final Type type, final JsonArray jsonArray) throws Exception {
         if (Class.class.isInstance(type)) {
             final Class clazz = Class.class.cast(type);
             if (clazz.isArray()) {
                 final Class<?> componentType = clazz.getComponentType();
                 return buildArrayWithComponentType(jsonArray, componentType);
             }
         }
 
         if (ParameterizedType.class.isInstance(type)) {
             final Mappings.CollectionMapping mapping = mappings.findCollectionMapping(ParameterizedType.class.cast(type));
             if (mapping != null) {
                 return mapCollection(mapping, jsonArray);
             }
         }
 
         if (Object.class == type) {
             return buildArray(ANY_LIST, jsonArray);
         }
 
         throw new UnsupportedOperationException("type " + type + " not supported");
     }
 
     private <T> Collection<T> mapCollection(final Mappings.CollectionMapping mapping, final JsonArray jsonArray) throws Exception {
         final Collection collection;
 
         if (SortedSet.class == mapping.raw) {
             collection = new TreeSet<T>();
         } else if (Set.class == mapping.raw) {
             collection = new HashSet<T>(jsonArray.size());
         } else if (Queue.class == mapping.raw) {
             collection = new ArrayBlockingQueue<T>(jsonArray.size());
         } else if (List.class == mapping.raw || Collection.class == mapping.raw) {
             collection = new ArrayList<T>(jsonArray.size());
         } else {
             throw new IllegalStateException("not supported collection type: " + mapping.raw.getName());
         }
 
         for (final JsonValue value : jsonArray) {
             final Object element = toObject(value, mapping.arg);
             collection.add(element);
         }
         return collection;
     }
 
     private Object buildArrayWithComponentType(final JsonArray jsonArray, final Class<?> componentType) throws Exception {
         final Object array = Array.newInstance(componentType, jsonArray.size());
         int i = 0;
         for (final JsonValue value : jsonArray) {
             Array.set(array, i++, toObject(value, componentType));
         }
         return array;
     }
 
     private static class FallbackConverter implements Converter<Object> {
         @Override
         public String toString(final Object instance) {
             return instance.toString();
         }
 
         @Override
         public Object fromString(final String text) {
             throw new UnsupportedOperationException("Using fallback converter, " +
                     "this only works in write mode but not in read. Please register a custom converter to do so.");
         }
     }
 }