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diff --git a/src/com/google/gson/Gson.java b/src/com/google/gson/Gson.java
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+/*
+ * Copyright (C) 2008 Google Inc.
+ *
+ * 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.google.gson;
+
+import com.google.gson.internal.ConstructorConstructor;
+import com.google.gson.internal.Excluder;
+import com.google.gson.internal.Primitives;
+import com.google.gson.internal.Streams;
+import com.google.gson.internal.bind.ArrayTypeAdapter;
+import com.google.gson.internal.bind.CollectionTypeAdapterFactory;
+import com.google.gson.internal.bind.DateTypeAdapter;
+import com.google.gson.internal.bind.JsonTreeReader;
+import com.google.gson.internal.bind.JsonTreeWriter;
+import com.google.gson.internal.bind.MapTypeAdapterFactory;
+import com.google.gson.internal.bind.ObjectTypeAdapter;
+import com.google.gson.internal.bind.ReflectiveTypeAdapterFactory;
+import com.google.gson.internal.bind.SqlDateTypeAdapter;
+import com.google.gson.internal.bind.TimeTypeAdapter;
+import com.google.gson.internal.bind.TypeAdapters;
+import com.google.gson.reflect.TypeToken;
+import com.google.gson.stream.JsonReader;
+import com.google.gson.stream.JsonToken;
+import com.google.gson.stream.JsonWriter;
+import com.google.gson.stream.MalformedJsonException;
+import java.io.EOFException;
+import java.io.IOException;
+import java.io.Reader;
+import java.io.StringReader;
+import java.io.StringWriter;
+import java.io.Writer;
+import java.lang.reflect.Type;
+import java.math.BigDecimal;
+import java.math.BigInteger;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * This is the main class for using Gson. Gson is typically used by first constructing a
+ * Gson instance and then invoking {@link #toJson(Object)} or {@link #fromJson(String, Class)}
+ * methods on it.
+ *
+ *
You can create a Gson instance by invoking {@code new Gson()} if the default configuration
+ * is all you need. You can also use {@link GsonBuilder} to build a Gson instance with various
+ * configuration options such as versioning support, pretty printing, custom
+ * {@link JsonSerializer}s, {@link JsonDeserializer}s, and {@link InstanceCreator}s.
+ *
+ *
Here is an example of how Gson is used for a simple Class:
+ *
+ *
+ * Gson gson = new Gson(); // Or use new GsonBuilder().create();
+ * MyType target = new MyType();
+ * String json = gson.toJson(target); // serializes target to Json
+ * MyType target2 = gson.fromJson(json, MyType.class); // deserializes json into target2
+ *
+ *
+ *
If the object that your are serializing/deserializing is a {@code ParameterizedType}
+ * (i.e. contains at least one type parameter and may be an array) then you must use the
+ * {@link #toJson(Object, Type)} or {@link #fromJson(String, Type)} method. Here is an
+ * example for serializing and deserialing a {@code ParameterizedType}:
+ *
+ *
See the Gson User Guide
+ * for a more complete set of examples.
+ *
+ * @see com.google.gson.reflect.TypeToken
+ *
+ * @author Inderjeet Singh
+ * @author Joel Leitch
+ * @author Jesse Wilson
+ */
+public final class Gson {
+ static final boolean DEFAULT_JSON_NON_EXECUTABLE = false;
+
+ private static final String JSON_NON_EXECUTABLE_PREFIX = ")]}'\n";
+
+ /**
+ * This thread local guards against reentrant calls to getAdapter(). In
+ * certain object graphs, creating an adapter for a type may recursively
+ * require an adapter for the same type! Without intervention, the recursive
+ * lookup would stack overflow. We cheat by returning a proxy type adapter.
+ * The proxy is wired up once the initial adapter has been created.
+ */
+ private final ThreadLocal, FutureTypeAdapter>> calls
+ = new ThreadLocal, FutureTypeAdapter>>();
+
+ private final Map, TypeAdapter> typeTokenCache
+ = Collections.synchronizedMap(new HashMap, TypeAdapter>());
+
+ private final List factories;
+ private final ConstructorConstructor constructorConstructor;
+
+ private final boolean serializeNulls;
+ private final boolean htmlSafe;
+ private final boolean generateNonExecutableJson;
+ private final boolean prettyPrinting;
+
+ final JsonDeserializationContext deserializationContext = new JsonDeserializationContext() {
+ @SuppressWarnings("unchecked")
+ public T deserialize(JsonElement json, Type typeOfT) throws JsonParseException {
+ return (T) fromJson(json, typeOfT);
+ }
+ };
+
+ final JsonSerializationContext serializationContext = new JsonSerializationContext() {
+ public JsonElement serialize(Object src) {
+ return toJsonTree(src);
+ }
+ public JsonElement serialize(Object src, Type typeOfSrc) {
+ return toJsonTree(src, typeOfSrc);
+ }
+ };
+
+ /**
+ * Constructs a Gson object with default configuration. The default configuration has the
+ * following settings:
+ *
+ *
The JSON generated by toJson methods is in compact representation. This
+ * means that all the unneeded white-space is removed. You can change this behavior with
+ * {@link GsonBuilder#setPrettyPrinting()}.
+ *
The generated JSON omits all the fields that are null. Note that nulls in arrays are
+ * kept as is since an array is an ordered list. Moreover, if a field is not null, but its
+ * generated JSON is empty, the field is kept. You can configure Gson to serialize null values
+ * by setting {@link GsonBuilder#serializeNulls()}.
+ *
Gson provides default serialization and deserialization for Enums, {@link Map},
+ * {@link java.net.URL}, {@link java.net.URI}, {@link java.util.Locale}, {@link java.util.Date},
+ * {@link java.math.BigDecimal}, and {@link java.math.BigInteger} classes. If you would prefer
+ * to change the default representation, you can do so by registering a type adapter through
+ * {@link GsonBuilder#registerTypeAdapter(Type, Object)}.
+ *
The default Date format is same as {@link java.text.DateFormat#DEFAULT}. This format
+ * ignores the millisecond portion of the date during serialization. You can change
+ * this by invoking {@link GsonBuilder#setDateFormat(int)} or
+ * {@link GsonBuilder#setDateFormat(String)}.
+ *
By default, Gson ignores the {@link com.google.gson.annotations.Expose} annotation.
+ * You can enable Gson to serialize/deserialize only those fields marked with this annotation
+ * through {@link GsonBuilder#excludeFieldsWithoutExposeAnnotation()}.
+ *
By default, Gson ignores the {@link com.google.gson.annotations.Since} annotation. You
+ * can enable Gson to use this annotation through {@link GsonBuilder#setVersion(double)}.
+ *
The default field naming policy for the output Json is same as in Java. So, a Java class
+ * field versionNumber will be output as "versionNumber@quot; in
+ * Json. The same rules are applied for mapping incoming Json to the Java classes. You can
+ * change this policy through {@link GsonBuilder#setFieldNamingPolicy(FieldNamingPolicy)}.
+ *
By default, Gson excludes transient or static fields from
+ * consideration for serialization and deserialization. You can change this behavior through
+ * {@link GsonBuilder#excludeFieldsWithModifiers(int...)}.
+ *
+ */
+ public Gson() {
+ this(Excluder.DEFAULT, FieldNamingPolicy.IDENTITY,
+ Collections.>emptyMap(), false, false, DEFAULT_JSON_NON_EXECUTABLE,
+ true, false, false, LongSerializationPolicy.DEFAULT,
+ Collections.emptyList());
+ }
+
+ Gson(final Excluder excluder, final FieldNamingStrategy fieldNamingPolicy,
+ final Map> instanceCreators, boolean serializeNulls,
+ boolean complexMapKeySerialization, boolean generateNonExecutableGson, boolean htmlSafe,
+ boolean prettyPrinting, boolean serializeSpecialFloatingPointValues,
+ LongSerializationPolicy longSerializationPolicy,
+ List typeAdapterFactories) {
+ this.constructorConstructor = new ConstructorConstructor(instanceCreators);
+ this.serializeNulls = serializeNulls;
+ this.generateNonExecutableJson = generateNonExecutableGson;
+ this.htmlSafe = htmlSafe;
+ this.prettyPrinting = prettyPrinting;
+
+ List factories = new ArrayList();
+
+ // built-in type adapters that cannot be overridden
+ factories.add(TypeAdapters.JSON_ELEMENT_FACTORY);
+ factories.add(ObjectTypeAdapter.FACTORY);
+
+ // the excluder must precede all adapters that handle user-defined types
+ factories.add(excluder);
+
+ // user's type adapters
+ factories.addAll(typeAdapterFactories);
+
+ // type adapters for basic platform types
+ factories.add(TypeAdapters.STRING_FACTORY);
+ factories.add(TypeAdapters.INTEGER_FACTORY);
+ factories.add(TypeAdapters.BOOLEAN_FACTORY);
+ factories.add(TypeAdapters.BYTE_FACTORY);
+ factories.add(TypeAdapters.SHORT_FACTORY);
+ factories.add(TypeAdapters.newFactory(long.class, Long.class,
+ longAdapter(longSerializationPolicy)));
+ factories.add(TypeAdapters.newFactory(double.class, Double.class,
+ doubleAdapter(serializeSpecialFloatingPointValues)));
+ factories.add(TypeAdapters.newFactory(float.class, Float.class,
+ floatAdapter(serializeSpecialFloatingPointValues)));
+ factories.add(TypeAdapters.NUMBER_FACTORY);
+ factories.add(TypeAdapters.CHARACTER_FACTORY);
+ factories.add(TypeAdapters.STRING_BUILDER_FACTORY);
+ factories.add(TypeAdapters.STRING_BUFFER_FACTORY);
+ factories.add(TypeAdapters.newFactory(BigDecimal.class, TypeAdapters.BIG_DECIMAL));
+ factories.add(TypeAdapters.newFactory(BigInteger.class, TypeAdapters.BIG_INTEGER));
+ factories.add(TypeAdapters.URL_FACTORY);
+ factories.add(TypeAdapters.URI_FACTORY);
+ factories.add(TypeAdapters.UUID_FACTORY);
+ factories.add(TypeAdapters.LOCALE_FACTORY);
+ factories.add(TypeAdapters.INET_ADDRESS_FACTORY);
+ factories.add(TypeAdapters.BIT_SET_FACTORY);
+ factories.add(DateTypeAdapter.FACTORY);
+ factories.add(TypeAdapters.CALENDAR_FACTORY);
+ factories.add(TimeTypeAdapter.FACTORY);
+ factories.add(SqlDateTypeAdapter.FACTORY);
+ factories.add(TypeAdapters.TIMESTAMP_FACTORY);
+ factories.add(ArrayTypeAdapter.FACTORY);
+ factories.add(TypeAdapters.ENUM_FACTORY);
+ factories.add(TypeAdapters.CLASS_FACTORY);
+
+ // type adapters for composite and user-defined types
+ factories.add(new CollectionTypeAdapterFactory(constructorConstructor));
+ factories.add(new MapTypeAdapterFactory(constructorConstructor, complexMapKeySerialization));
+ factories.add(new ReflectiveTypeAdapterFactory(
+ constructorConstructor, fieldNamingPolicy, excluder));
+
+ this.factories = Collections.unmodifiableList(factories);
+ }
+
+ private TypeAdapter doubleAdapter(boolean serializeSpecialFloatingPointValues) {
+ if (serializeSpecialFloatingPointValues) {
+ return TypeAdapters.DOUBLE;
+ }
+ return new TypeAdapter() {
+ @Override public Double read(JsonReader in) throws IOException {
+ if (in.peek() == JsonToken.NULL) {
+ in.nextNull();
+ return null;
+ }
+ return in.nextDouble();
+ }
+ @Override public void write(JsonWriter out, Number value) throws IOException {
+ if (value == null) {
+ out.nullValue();
+ return;
+ }
+ double doubleValue = value.doubleValue();
+ checkValidFloatingPoint(doubleValue);
+ out.value(value);
+ }
+ };
+ }
+
+ private TypeAdapter floatAdapter(boolean serializeSpecialFloatingPointValues) {
+ if (serializeSpecialFloatingPointValues) {
+ return TypeAdapters.FLOAT;
+ }
+ return new TypeAdapter() {
+ @Override public Float read(JsonReader in) throws IOException {
+ if (in.peek() == JsonToken.NULL) {
+ in.nextNull();
+ return null;
+ }
+ return (float) in.nextDouble();
+ }
+ @Override public void write(JsonWriter out, Number value) throws IOException {
+ if (value == null) {
+ out.nullValue();
+ return;
+ }
+ float floatValue = value.floatValue();
+ checkValidFloatingPoint(floatValue);
+ out.value(value);
+ }
+ };
+ }
+
+ private void checkValidFloatingPoint(double value) {
+ if (Double.isNaN(value) || Double.isInfinite(value)) {
+ throw new IllegalArgumentException(value
+ + " is not a valid double value as per JSON specification. To override this"
+ + " behavior, use GsonBuilder.serializeSpecialFloatingPointValues() method.");
+ }
+ }
+
+ private TypeAdapter longAdapter(LongSerializationPolicy longSerializationPolicy) {
+ if (longSerializationPolicy == LongSerializationPolicy.DEFAULT) {
+ return TypeAdapters.LONG;
+ }
+ return new TypeAdapter() {
+ @Override public Number read(JsonReader in) throws IOException {
+ if (in.peek() == JsonToken.NULL) {
+ in.nextNull();
+ return null;
+ }
+ return in.nextLong();
+ }
+ @Override public void write(JsonWriter out, Number value) throws IOException {
+ if (value == null) {
+ out.nullValue();
+ return;
+ }
+ out.value(value.toString());
+ }
+ };
+ }
+
+ /**
+ * Returns the type adapter for {@code} type.
+ *
+ * @throws IllegalArgumentException if this GSON cannot serialize and
+ * deserialize {@code type}.
+ */
+ @SuppressWarnings("unchecked")
+ public TypeAdapter getAdapter(TypeToken type) {
+ TypeAdapter cached = typeTokenCache.get(type);
+ if (cached != null) {
+ return (TypeAdapter) cached;
+ }
+
+ Map, FutureTypeAdapter> threadCalls = calls.get();
+ boolean requiresThreadLocalCleanup = false;
+ if (threadCalls == null) {
+ threadCalls = new HashMap, FutureTypeAdapter>();
+ calls.set(threadCalls);
+ requiresThreadLocalCleanup = true;
+ }
+
+ // the key and value type parameters always agree
+ FutureTypeAdapter ongoingCall = (FutureTypeAdapter) threadCalls.get(type);
+ if (ongoingCall != null) {
+ return ongoingCall;
+ }
+
+ try {
+ FutureTypeAdapter call = new FutureTypeAdapter();
+ threadCalls.put(type, call);
+
+ for (TypeAdapterFactory factory : factories) {
+ TypeAdapter candidate = factory.create(this, type);
+ if (candidate != null) {
+ call.setDelegate(candidate);
+ typeTokenCache.put(type, candidate);
+ return candidate;
+ }
+ }
+ throw new IllegalArgumentException("GSON cannot handle " + type);
+ } finally {
+ threadCalls.remove(type);
+
+ if (requiresThreadLocalCleanup) {
+ calls.remove();
+ }
+ }
+ }
+
+ /**
+ * This method is used to get an alternate type adapter for the specified type. This is used
+ * to access a type adapter that is overridden by a {@link TypeAdapterFactory} that you
+ * may have registered. This features is typically used when you want to register a type
+ * adapter that does a little bit of work but then delegates further processing to the Gson
+ * default type adapter. Here is an example:
+ *
Let's say we want to write a type adapter that counts the number of objects being read
+ * from or written to JSON. We can achieve this by writing a type adapter factory that uses
+ * the getDelegateAdapter method:
+ *
{@code
+ * class StatsTypeAdapterFactory implements TypeAdapterFactory {
+ * public int numReads = 0;
+ * public int numWrites = 0;
+ * public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
+ * final TypeAdapter<T> delegate = gson.getDelegateAdapter(this, type);
+ * return new TypeAdapter<T>() {
+ * public void write(JsonWriter out, T value) throws IOException {
+ * ++numWrites;
+ * delegate.write(out, value);
+ * }
+ * public T read(JsonReader in) throws IOException {
+ * ++numReads;
+ * return delegate.read(in);
+ * }
+ * };
+ * }
+ * }
+ * }
+ * Note that since you can not override type adapter factories for String and Java primitive
+ * types, our stats factory will not count the number of String or primitives that will be
+ * read or written.
+ * @param skipPast The type adapter factory that needs to be skipped while searching for
+ * a matching type adapter. In most cases, you should just pass this (the type adapter
+ * factory from where {@link #getDelegateAdapter} method is being invoked).
+ * @param type Type for which the delegate adapter is being searched for.
+ *
+ * @since 2.2
+ */
+ public TypeAdapter getDelegateAdapter(TypeAdapterFactory skipPast, TypeToken type) {
+ boolean skipPastFound = false;
+
+ for (TypeAdapterFactory factory : factories) {
+ if (!skipPastFound) {
+ if (factory == skipPast) {
+ skipPastFound = true;
+ }
+ continue;
+ }
+
+ TypeAdapter candidate = factory.create(this, type);
+ if (candidate != null) {
+ return candidate;
+ }
+ }
+ throw new IllegalArgumentException("GSON cannot serialize " + type);
+ }
+
+ /**
+ * Returns the type adapter for {@code} type.
+ *
+ * @throws IllegalArgumentException if this GSON cannot serialize and
+ * deserialize {@code type}.
+ */
+ public TypeAdapter getAdapter(Class type) {
+ return getAdapter(TypeToken.get(type));
+ }
+
+ /**
+ * This method serializes the specified object into its equivalent representation as a tree of
+ * {@link JsonElement}s. This method should be used when the specified object is not a generic
+ * type. This method uses {@link Class#getClass()} to get the type for the specified object, but
+ * the {@code getClass()} loses the generic type information because of the Type Erasure feature
+ * of Java. Note that this method works fine if the any of the object fields are of generic type,
+ * just the object itself should not be of a generic type. If the object is of generic type, use
+ * {@link #toJsonTree(Object, Type)} instead.
+ *
+ * @param src the object for which Json representation is to be created setting for Gson
+ * @return Json representation of {@code src}.
+ * @since 1.4
+ */
+ public JsonElement toJsonTree(Object src) {
+ if (src == null) {
+ return JsonNull.INSTANCE;
+ }
+ return toJsonTree(src, src.getClass());
+ }
+
+ /**
+ * This method serializes the specified object, including those of generic types, into its
+ * equivalent representation as a tree of {@link JsonElement}s. This method must be used if the
+ * specified object is a generic type. For non-generic objects, use {@link #toJsonTree(Object)}
+ * instead.
+ *
+ * @param src the object for which JSON representation is to be created
+ * @param typeOfSrc The specific genericized type of src. You can obtain
+ * this type by using the {@link com.google.gson.reflect.TypeToken} class. For example,
+ * to get the type for {@code Collection}, you should use:
+ *
+ * Type typeOfSrc = new TypeToken<Collection<Foo>>(){}.getType();
+ *
+ * @return Json representation of {@code src}
+ * @since 1.4
+ */
+ public JsonElement toJsonTree(Object src, Type typeOfSrc) {
+ JsonTreeWriter writer = new JsonTreeWriter();
+ toJson(src, typeOfSrc, writer);
+ return writer.get();
+ }
+
+ /**
+ * This method serializes the specified object into its equivalent Json representation.
+ * This method should be used when the specified object is not a generic type. This method uses
+ * {@link Class#getClass()} to get the type for the specified object, but the
+ * {@code getClass()} loses the generic type information because of the Type Erasure feature
+ * of Java. Note that this method works fine if the any of the object fields are of generic type,
+ * just the object itself should not be of a generic type. If the object is of generic type, use
+ * {@link #toJson(Object, Type)} instead. If you want to write out the object to a
+ * {@link Writer}, use {@link #toJson(Object, Appendable)} instead.
+ *
+ * @param src the object for which Json representation is to be created setting for Gson
+ * @return Json representation of {@code src}.
+ */
+ public String toJson(Object src) {
+ if (src == null) {
+ return toJson(JsonNull.INSTANCE);
+ }
+ return toJson(src, src.getClass());
+ }
+
+ /**
+ * This method serializes the specified object, including those of generic types, into its
+ * equivalent Json representation. This method must be used if the specified object is a generic
+ * type. For non-generic objects, use {@link #toJson(Object)} instead. If you want to write out
+ * the object to a {@link Appendable}, use {@link #toJson(Object, Type, Appendable)} instead.
+ *
+ * @param src the object for which JSON representation is to be created
+ * @param typeOfSrc The specific genericized type of src. You can obtain
+ * this type by using the {@link com.google.gson.reflect.TypeToken} class. For example,
+ * to get the type for {@code Collection}, you should use:
+ *
+ * Type typeOfSrc = new TypeToken<Collection<Foo>>(){}.getType();
+ *
+ * @return Json representation of {@code src}
+ */
+ public String toJson(Object src, Type typeOfSrc) {
+ StringWriter writer = new StringWriter();
+ toJson(src, typeOfSrc, writer);
+ return writer.toString();
+ }
+
+ /**
+ * This method serializes the specified object into its equivalent Json representation.
+ * This method should be used when the specified object is not a generic type. This method uses
+ * {@link Class#getClass()} to get the type for the specified object, but the
+ * {@code getClass()} loses the generic type information because of the Type Erasure feature
+ * of Java. Note that this method works fine if the any of the object fields are of generic type,
+ * just the object itself should not be of a generic type. If the object is of generic type, use
+ * {@link #toJson(Object, Type, Appendable)} instead.
+ *
+ * @param src the object for which Json representation is to be created setting for Gson
+ * @param writer Writer to which the Json representation needs to be written
+ * @throws JsonIOException if there was a problem writing to the writer
+ * @since 1.2
+ */
+ public void toJson(Object src, Appendable writer) throws JsonIOException {
+ if (src != null) {
+ toJson(src, src.getClass(), writer);
+ } else {
+ toJson(JsonNull.INSTANCE, writer);
+ }
+ }
+
+ /**
+ * This method serializes the specified object, including those of generic types, into its
+ * equivalent Json representation. This method must be used if the specified object is a generic
+ * type. For non-generic objects, use {@link #toJson(Object, Appendable)} instead.
+ *
+ * @param src the object for which JSON representation is to be created
+ * @param typeOfSrc The specific genericized type of src. You can obtain
+ * this type by using the {@link com.google.gson.reflect.TypeToken} class. For example,
+ * to get the type for {@code Collection}, you should use:
+ *
+ * Type typeOfSrc = new TypeToken<Collection<Foo>>(){}.getType();
+ *
+ * @param writer Writer to which the Json representation of src needs to be written.
+ * @throws JsonIOException if there was a problem writing to the writer
+ * @since 1.2
+ */
+ public void toJson(Object src, Type typeOfSrc, Appendable writer) throws JsonIOException {
+ try {
+ JsonWriter jsonWriter = newJsonWriter(Streams.writerForAppendable(writer));
+ toJson(src, typeOfSrc, jsonWriter);
+ } catch (IOException e) {
+ throw new JsonIOException(e);
+ }
+ }
+
+ /**
+ * Writes the JSON representation of {@code src} of type {@code typeOfSrc} to
+ * {@code writer}.
+ * @throws JsonIOException if there was a problem writing to the writer
+ */
+ @SuppressWarnings("unchecked")
+ public void toJson(Object src, Type typeOfSrc, JsonWriter writer) throws JsonIOException {
+ TypeAdapter adapter = getAdapter(TypeToken.get(typeOfSrc));
+ boolean oldLenient = writer.isLenient();
+ writer.setLenient(true);
+ boolean oldHtmlSafe = writer.isHtmlSafe();
+ writer.setHtmlSafe(htmlSafe);
+ boolean oldSerializeNulls = writer.getSerializeNulls();
+ writer.setSerializeNulls(serializeNulls);
+ try {
+ ((TypeAdapter