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com.google.gson.internal.bind.TypeAdapters Maven / Gradle / Ivy
/*
* Copyright (C) 2011 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.internal.bind;
import java.io.IOException;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.net.InetAddress;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.sql.Timestamp;
import java.util.ArrayList;
import java.util.BitSet;
import java.util.Calendar;
import java.util.Currency;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.StringTokenizer;
import java.util.UUID;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicIntegerArray;
import com.google.gson.Gson;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonIOException;
import com.google.gson.JsonNull;
import com.google.gson.JsonObject;
import com.google.gson.JsonPrimitive;
import com.google.gson.JsonSyntaxException;
import com.google.gson.TypeAdapter;
import com.google.gson.TypeAdapterFactory;
import com.google.gson.annotations.SerializedName;
import com.google.gson.internal.LazilyParsedNumber;
import com.google.gson.reflect.TypeToken;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonToken;
import com.google.gson.stream.JsonWriter;
/**
* Type adapters for basic types.
*/
public final class TypeAdapters {
private TypeAdapters() {
throw new UnsupportedOperationException();
}
@SuppressWarnings("rawtypes")
public static final TypeAdapter CLASS = new TypeAdapter() {
@Override
public void write(JsonWriter out, Class value) throws IOException {
if (value == null) {
out.nullValue();
} else {
throw new UnsupportedOperationException("Attempted to serialize java.lang.Class: "
+ value.getName() + ". Forgot to register a type adapter?");
}
}
@Override
public Class read(JsonReader in) throws IOException {
if (in.peek() == JsonToken.NULL) {
in.nextNull();
return null;
} else {
throw new UnsupportedOperationException(
"Attempted to deserialize a java.lang.Class. Forgot to register a type adapter?");
}
}
};
public static final TypeAdapterFactory CLASS_FACTORY = newFactory(Class.class, CLASS);
public static final TypeAdapter BIT_SET = new TypeAdapter() {
@Override public BitSet read(JsonReader in) throws IOException {
if (in.peek() == JsonToken.NULL) {
in.nextNull();
return null;
}
BitSet bitset = new BitSet();
in.beginArray();
int i = 0;
JsonToken tokenType = in.peek();
while (tokenType != JsonToken.END_ARRAY) {
boolean set;
switch (tokenType) {
case NUMBER:
set = in.nextInt() != 0;
break;
case BOOLEAN:
set = in.nextBoolean();
break;
case STRING:
String stringValue = in.nextString();
try {
set = Integer.parseInt(stringValue) != 0;
} catch (NumberFormatException e) {
throw new JsonSyntaxException(
"Error: Expecting: bitset number value (1, 0), Found: " + stringValue);
}
break;
default:
throw new JsonSyntaxException("Invalid bitset value type: " + tokenType);
}
if (set) {
bitset.set(i);
}
++i;
tokenType = in.peek();
}
in.endArray();
return bitset;
}
@Override public void write(JsonWriter out, BitSet src) throws IOException {
if (src == null) {
out.nullValue();
return;
}
out.beginArray();
for (int i = 0; i < src.length(); i++) {
int value = (src.get(i)) ? 1 : 0;
out.value(value);
}
out.endArray();
}
};
public static final TypeAdapterFactory BIT_SET_FACTORY = newFactory(BitSet.class, BIT_SET);
public static final TypeAdapter BOOLEAN = new TypeAdapter() {
@Override
public Boolean read(JsonReader in) throws IOException {
if (in.peek() == JsonToken.NULL) {
in.nextNull();
return null;
} else if (in.peek() == JsonToken.STRING) {
// support strings for compatibility with GSON 1.7
return Boolean.parseBoolean(in.nextString());
}
return in.nextBoolean();
}
@Override
public void write(JsonWriter out, Boolean value) throws IOException {
out.value(value);
}
};
/**
* Writes a boolean as a string. Useful for map keys, where booleans aren't
* otherwise permitted.
*/
public static final TypeAdapter BOOLEAN_AS_STRING = new TypeAdapter() {
@Override public Boolean read(JsonReader in) throws IOException {
if (in.peek() == JsonToken.NULL) {
in.nextNull();
return null;
}
return Boolean.valueOf(in.nextString());
}
@Override public void write(JsonWriter out, Boolean value) throws IOException {
out.value(value == null ? "null" : value.toString());
}
};
public static final TypeAdapterFactory BOOLEAN_FACTORY
= newFactory(boolean.class, Boolean.class, BOOLEAN);
public static final TypeAdapter BYTE = new TypeAdapter() {
@Override
public Number read(JsonReader in) throws IOException {
if (in.peek() == JsonToken.NULL) {
in.nextNull();
return null;
}
try {
int intValue = in.nextInt();
return (byte) intValue;
} catch (NumberFormatException e) {
throw new JsonSyntaxException(e);
}
}
@Override
public void write(JsonWriter out, Number value) throws IOException {
out.value(value);
}
};
public static final TypeAdapterFactory BYTE_FACTORY
= newFactory(byte.class, Byte.class, BYTE);
public static final TypeAdapter SHORT = new TypeAdapter() {
@Override
public Number read(JsonReader in) throws IOException {
if (in.peek() == JsonToken.NULL) {
in.nextNull();
return null;
}
try {
return (short) in.nextInt();
} catch (NumberFormatException e) {
throw new JsonSyntaxException(e);
}
}
@Override
public void write(JsonWriter out, Number value) throws IOException {
out.value(value);
}
};
public static final TypeAdapterFactory SHORT_FACTORY
= newFactory(short.class, Short.class, SHORT);
public static final TypeAdapter INTEGER = new TypeAdapter() {
@Override
public Number read(JsonReader in) throws IOException {
if (in.peek() == JsonToken.NULL) {
in.nextNull();
return null;
}
try {
return in.nextInt();
} catch (NumberFormatException e) {
throw new JsonSyntaxException(e);
}
}
@Override
public void write(JsonWriter out, Number value) throws IOException {
out.value(value);
}
};
public static final TypeAdapterFactory INTEGER_FACTORY
= newFactory(int.class, Integer.class, INTEGER);
public static final TypeAdapter ATOMIC_INTEGER = new TypeAdapter() {
@Override public AtomicInteger read(JsonReader in) throws IOException {
try {
return new AtomicInteger(in.nextInt());
} catch (NumberFormatException e) {
throw new JsonSyntaxException(e);
}
}
@Override public void write(JsonWriter out, AtomicInteger value) throws IOException {
out.value(value.get());
}
}.nullSafe();
public static final TypeAdapterFactory ATOMIC_INTEGER_FACTORY =
newFactory(AtomicInteger.class, TypeAdapters.ATOMIC_INTEGER);
public static final TypeAdapter ATOMIC_BOOLEAN = new TypeAdapter() {
@Override public AtomicBoolean read(JsonReader in) throws IOException {
return new AtomicBoolean(in.nextBoolean());
}
@Override public void write(JsonWriter out, AtomicBoolean value) throws IOException {
out.value(value.get());
}
}.nullSafe();
public static final TypeAdapterFactory ATOMIC_BOOLEAN_FACTORY =
newFactory(AtomicBoolean.class, TypeAdapters.ATOMIC_BOOLEAN);
public static final TypeAdapter ATOMIC_INTEGER_ARRAY = new TypeAdapter() {
@Override public AtomicIntegerArray read(JsonReader in) throws IOException {
List list = new ArrayList();
in.beginArray();
while (in.hasNext()) {
try {
int integer = in.nextInt();
list.add(integer);
} catch (NumberFormatException e) {
throw new JsonSyntaxException(e);
}
}
in.endArray();
int length = list.size();
AtomicIntegerArray array = new AtomicIntegerArray(length);
for (int i = 0; i < length; ++i) {
array.set(i, list.get(i));
}
return array;
}
@Override public void write(JsonWriter out, AtomicIntegerArray value) throws IOException {
out.beginArray();
for (int i = 0, length = value.length(); i < length; i++) {
out.value(value.get(i));
}
out.endArray();
}
}.nullSafe();
public static final TypeAdapterFactory ATOMIC_INTEGER_ARRAY_FACTORY =
newFactory(AtomicIntegerArray.class, TypeAdapters.ATOMIC_INTEGER_ARRAY);
public static final TypeAdapter LONG = new TypeAdapter() {
@Override
public Number read(JsonReader in) throws IOException {
if (in.peek() == JsonToken.NULL) {
in.nextNull();
return null;
}
try {
return in.nextLong();
} catch (NumberFormatException e) {
throw new JsonSyntaxException(e);
}
}
@Override
public void write(JsonWriter out, Number value) throws IOException {
out.value(value);
}
};
public static final TypeAdapter FLOAT = new TypeAdapter() {
@Override
public Number 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 {
out.value(value);
}
};
public static final TypeAdapter DOUBLE = new TypeAdapter() {
@Override
public Number 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 {
out.value(value);
}
};
public static final TypeAdapter NUMBER = new TypeAdapter() {
@Override
public Number read(JsonReader in) throws IOException {
JsonToken jsonToken = in.peek();
switch (jsonToken) {
case NULL:
in.nextNull();
return null;
case NUMBER:
return new LazilyParsedNumber(in.nextString());
default:
throw new JsonSyntaxException("Expecting number, got: " + jsonToken);
}
}
@Override
public void write(JsonWriter out, Number value) throws IOException {
out.value(value);
}
};
public static final TypeAdapterFactory NUMBER_FACTORY = newFactory(Number.class, NUMBER);
public static final TypeAdapter CHARACTER = new TypeAdapter() {
@Override
public Character read(JsonReader in) throws IOException {
if (in.peek() == JsonToken.NULL) {
in.nextNull();
return null;
}
String str = in.nextString();
if (str.length() != 1) {
throw new JsonSyntaxException("Expecting character, got: " + str);
}
return str.charAt(0);
}
@Override
public void write(JsonWriter out, Character value) throws IOException {
out.value(value == null ? null : String.valueOf(value));
}
};
public static final TypeAdapterFactory CHARACTER_FACTORY
= newFactory(char.class, Character.class, CHARACTER);
public static final TypeAdapter STRING = new TypeAdapter() {
@Override
public String read(JsonReader in) throws IOException {
JsonToken peek = in.peek();
if (peek == JsonToken.NULL) {
in.nextNull();
return null;
}
/* coerce booleans to strings for backwards compatibility */
if (peek == JsonToken.BOOLEAN) {
return Boolean.toString(in.nextBoolean());
}
return in.nextString();
}
@Override
public void write(JsonWriter out, String value) throws IOException {
out.value(value);
}
};
public static final TypeAdapter BIG_DECIMAL = new TypeAdapter() {
@Override public BigDecimal read(JsonReader in) throws IOException {
if (in.peek() == JsonToken.NULL) {
in.nextNull();
return null;
}
try {
return new BigDecimal(in.nextString());
} catch (NumberFormatException e) {
throw new JsonSyntaxException(e);
}
}
@Override public void write(JsonWriter out, BigDecimal value) throws IOException {
out.value(value);
}
};
public static final TypeAdapter BIG_INTEGER = new TypeAdapter() {
@Override public BigInteger read(JsonReader in) throws IOException {
if (in.peek() == JsonToken.NULL) {
in.nextNull();
return null;
}
try {
return new BigInteger(in.nextString());
} catch (NumberFormatException e) {
throw new JsonSyntaxException(e);
}
}
@Override public void write(JsonWriter out, BigInteger value) throws IOException {
out.value(value);
}
};
public static final TypeAdapterFactory STRING_FACTORY = newFactory(String.class, STRING);
public static final TypeAdapter STRING_BUILDER = new TypeAdapter() {
@Override
public StringBuilder read(JsonReader in) throws IOException {
if (in.peek() == JsonToken.NULL) {
in.nextNull();
return null;
}
return new StringBuilder(in.nextString());
}
@Override
public void write(JsonWriter out, StringBuilder value) throws IOException {
out.value(value == null ? null : value.toString());
}
};
public static final TypeAdapterFactory STRING_BUILDER_FACTORY =
newFactory(StringBuilder.class, STRING_BUILDER);
public static final TypeAdapter STRING_BUFFER = new TypeAdapter() {
@Override
public StringBuffer read(JsonReader in) throws IOException {
if (in.peek() == JsonToken.NULL) {
in.nextNull();
return null;
}
return new StringBuffer(in.nextString());
}
@Override
public void write(JsonWriter out, StringBuffer value) throws IOException {
out.value(value == null ? null : value.toString());
}
};
public static final TypeAdapterFactory STRING_BUFFER_FACTORY =
newFactory(StringBuffer.class, STRING_BUFFER);
public static final TypeAdapter URL = new TypeAdapter() {
@Override
public URL read(JsonReader in) throws IOException {
if (in.peek() == JsonToken.NULL) {
in.nextNull();
return null;
}
String nextString = in.nextString();
return "null".equals(nextString) ? null : new URL(nextString);
}
@Override
public void write(JsonWriter out, URL value) throws IOException {
out.value(value == null ? null : value.toExternalForm());
}
};
public static final TypeAdapterFactory URL_FACTORY = newFactory(URL.class, URL);
public static final TypeAdapter URI = new TypeAdapter() {
@Override
public URI read(JsonReader in) throws IOException {
if (in.peek() == JsonToken.NULL) {
in.nextNull();
return null;
}
try {
String nextString = in.nextString();
return "null".equals(nextString) ? null : new URI(nextString);
} catch (URISyntaxException e) {
throw new JsonIOException(e);
}
}
@Override
public void write(JsonWriter out, URI value) throws IOException {
out.value(value == null ? null : value.toASCIIString());
}
};
public static final TypeAdapterFactory URI_FACTORY = newFactory(URI.class, URI);
public static final TypeAdapter INET_ADDRESS = new TypeAdapter() {
@Override
public InetAddress read(JsonReader in) throws IOException {
if (in.peek() == JsonToken.NULL) {
in.nextNull();
return null;
}
// regrettably, this should have included both the host name and the host address
return InetAddress.getByName(in.nextString());
}
@Override
public void write(JsonWriter out, InetAddress value) throws IOException {
out.value(value == null ? null : value.getHostAddress());
}
};
public static final TypeAdapterFactory INET_ADDRESS_FACTORY =
newTypeHierarchyFactory(InetAddress.class, INET_ADDRESS);
public static final TypeAdapter UUID = new TypeAdapter() {
@Override
public UUID read(JsonReader in) throws IOException {
if (in.peek() == JsonToken.NULL) {
in.nextNull();
return null;
}
return java.util.UUID.fromString(in.nextString());
}
@Override
public void write(JsonWriter out, UUID value) throws IOException {
out.value(value == null ? null : value.toString());
}
};
public static final TypeAdapterFactory UUID_FACTORY = newFactory(UUID.class, UUID);
public static final TypeAdapter CURRENCY = new TypeAdapter() {
@Override
public Currency read(JsonReader in) throws IOException {
return Currency.getInstance(in.nextString());
}
@Override
public void write(JsonWriter out, Currency value) throws IOException {
out.value(value.getCurrencyCode());
}
}.nullSafe();
public static final TypeAdapterFactory CURRENCY_FACTORY = newFactory(Currency.class, CURRENCY);
public static final TypeAdapterFactory TIMESTAMP_FACTORY = new TypeAdapterFactory() {
@SuppressWarnings("unchecked") // we use a runtime check to make sure the 'T's equal
@Override public TypeAdapter create(Gson gson, TypeToken typeToken) {
if (typeToken.getRawType() != Timestamp.class) {
return null;
}
final TypeAdapter dateTypeAdapter = gson.getAdapter(Date.class);
return (TypeAdapter) new TypeAdapter() {
@Override public Timestamp read(JsonReader in) throws IOException {
Date date = dateTypeAdapter.read(in);
return date != null ? new Timestamp(date.getTime()) : null;
}
@Override public void write(JsonWriter out, Timestamp value) throws IOException {
dateTypeAdapter.write(out, value);
}
};
}
};
public static final TypeAdapter CALENDAR = new TypeAdapter() {
private static final String YEAR = "year";
private static final String MONTH = "month";
private static final String DAY_OF_MONTH = "dayOfMonth";
private static final String HOUR_OF_DAY = "hourOfDay";
private static final String MINUTE = "minute";
private static final String SECOND = "second";
@Override
public Calendar read(JsonReader in) throws IOException {
if (in.peek() == JsonToken.NULL) {
in.nextNull();
return null;
}
in.beginObject();
int year = 0;
int month = 0;
int dayOfMonth = 0;
int hourOfDay = 0;
int minute = 0;
int second = 0;
while (in.peek() != JsonToken.END_OBJECT) {
String name = in.nextName();
int value = in.nextInt();
if (YEAR.equals(name)) {
year = value;
} else if (MONTH.equals(name)) {
month = value;
} else if (DAY_OF_MONTH.equals(name)) {
dayOfMonth = value;
} else if (HOUR_OF_DAY.equals(name)) {
hourOfDay = value;
} else if (MINUTE.equals(name)) {
minute = value;
} else if (SECOND.equals(name)) {
second = value;
}
}
in.endObject();
return new GregorianCalendar(year, month, dayOfMonth, hourOfDay, minute, second);
}
@Override
public void write(JsonWriter out, Calendar value) throws IOException {
if (value == null) {
out.nullValue();
return;
}
out.beginObject();
out.name(YEAR);
out.value(value.get(Calendar.YEAR));
out.name(MONTH);
out.value(value.get(Calendar.MONTH));
out.name(DAY_OF_MONTH);
out.value(value.get(Calendar.DAY_OF_MONTH));
out.name(HOUR_OF_DAY);
out.value(value.get(Calendar.HOUR_OF_DAY));
out.name(MINUTE);
out.value(value.get(Calendar.MINUTE));
out.name(SECOND);
out.value(value.get(Calendar.SECOND));
out.endObject();
}
};
public static final TypeAdapterFactory CALENDAR_FACTORY =
newFactoryForMultipleTypes(Calendar.class, GregorianCalendar.class, CALENDAR);
public static final TypeAdapter LOCALE = new TypeAdapter() {
@Override
public Locale read(JsonReader in) throws IOException {
if (in.peek() == JsonToken.NULL) {
in.nextNull();
return null;
}
String locale = in.nextString();
StringTokenizer tokenizer = new StringTokenizer(locale, "_");
String language = null;
String country = null;
String variant = null;
if (tokenizer.hasMoreElements()) {
language = tokenizer.nextToken();
}
if (tokenizer.hasMoreElements()) {
country = tokenizer.nextToken();
}
if (tokenizer.hasMoreElements()) {
variant = tokenizer.nextToken();
}
if (country == null && variant == null) {
return new Locale(language);
} else if (variant == null) {
return new Locale(language, country);
} else {
return new Locale(language, country, variant);
}
}
@Override
public void write(JsonWriter out, Locale value) throws IOException {
out.value(value == null ? null : value.toString());
}
};
public static final TypeAdapterFactory LOCALE_FACTORY = newFactory(Locale.class, LOCALE);
public static final TypeAdapter JSON_ELEMENT = new TypeAdapter() {
@Override public JsonElement read(JsonReader in) throws IOException {
switch (in.peek()) {
case STRING:
return new JsonPrimitive(in.nextString());
case NUMBER:
String number = in.nextString();
return new JsonPrimitive(new LazilyParsedNumber(number));
case BOOLEAN:
return new JsonPrimitive(in.nextBoolean());
case NULL:
in.nextNull();
return JsonNull.INSTANCE;
case BEGIN_ARRAY:
JsonArray array = new JsonArray();
in.beginArray();
while (in.hasNext()) {
array.add(read(in));
}
in.endArray();
return array;
case BEGIN_OBJECT:
JsonObject object = new JsonObject();
in.beginObject();
while (in.hasNext()) {
object.add(in.nextName(), read(in));
}
in.endObject();
return object;
case END_DOCUMENT:
case NAME:
case END_OBJECT:
case END_ARRAY:
default:
throw new IllegalArgumentException();
}
}
@Override public void write(JsonWriter out, JsonElement value) throws IOException {
if (value == null || value.isJsonNull()) {
out.nullValue();
} else if (value.isJsonPrimitive()) {
JsonPrimitive primitive = value.getAsJsonPrimitive();
if (primitive.isNumber()) {
out.value(primitive.getAsNumber());
} else if (primitive.isBoolean()) {
out.value(primitive.getAsBoolean());
} else {
out.value(primitive.getAsString());
}
} else if (value.isJsonArray()) {
out.beginArray();
for (JsonElement e : value.getAsJsonArray()) {
write(out, e);
}
out.endArray();
} else if (value.isJsonObject()) {
out.beginObject();
for (Map.Entry e : value.getAsJsonObject().entrySet()) {
out.name(e.getKey());
write(out, e.getValue());
}
out.endObject();
} else {
throw new IllegalArgumentException("Couldn't write " + value.getClass());
}
}
};
public static final TypeAdapterFactory JSON_ELEMENT_FACTORY
= newTypeHierarchyFactory(JsonElement.class, JSON_ELEMENT);
private static final class EnumTypeAdapter> extends TypeAdapter {
private final Map nameToConstant = new HashMap();
private final Map constantToName = new HashMap();
public EnumTypeAdapter(Class classOfT) {
try {
for (T constant : classOfT.getEnumConstants()) {
String name = constant.name();
SerializedName annotation = classOfT.getField(name).getAnnotation(SerializedName.class);
if (annotation != null) {
name = annotation.value();
for (String alternate : annotation.alternate()) {
nameToConstant.put(alternate, constant);
}
}
nameToConstant.put(name, constant);
constantToName.put(constant, name);
}
} catch (NoSuchFieldException e) {
throw new AssertionError(e);
}
}
@Override public T read(JsonReader in) throws IOException {
if (in.peek() == JsonToken.NULL) {
in.nextNull();
return null;
}
return nameToConstant.get(in.nextString());
}
@Override public void write(JsonWriter out, T value) throws IOException {
out.value(value == null ? null : constantToName.get(value));
}
}
public static final TypeAdapterFactory ENUM_FACTORY = new TypeAdapterFactory() {
@SuppressWarnings({"rawtypes", "unchecked"})
@Override public TypeAdapter create(Gson gson, TypeToken typeToken) {
Class rawType = typeToken.getRawType();
if (!Enum.class.isAssignableFrom(rawType) || rawType == Enum.class) {
return null;
}
if (!rawType.isEnum()) {
rawType = rawType.getSuperclass(); // handle anonymous subclasses
}
return (TypeAdapter) new EnumTypeAdapter(rawType);
}
};
public static TypeAdapterFactory newFactory(
final TypeToken type, final TypeAdapter typeAdapter) {
return new TypeAdapterFactory() {
@SuppressWarnings("unchecked") // we use a runtime check to make sure the 'T's equal
@Override public TypeAdapter create(Gson gson, TypeToken typeToken) {
return typeToken.equals(type) ? (TypeAdapter) typeAdapter : null;
}
};
}
public static TypeAdapterFactory newFactory(
final Class type, final TypeAdapter typeAdapter) {
return new TypeAdapterFactory() {
@SuppressWarnings("unchecked") // we use a runtime check to make sure the 'T's equal
@Override public TypeAdapter create(Gson gson, TypeToken typeToken) {
return typeToken.getRawType() == type ? (TypeAdapter) typeAdapter : null;
}
@Override public String toString() {
return "Factory[type=" + type.getName() + ",adapter=" + typeAdapter + "]";
}
};
}
public static TypeAdapterFactory newFactory(
final Class unboxed, final Class boxed, final TypeAdapter typeAdapter) {
return new TypeAdapterFactory() {
@SuppressWarnings("unchecked") // we use a runtime check to make sure the 'T's equal
@Override public TypeAdapter create(Gson gson, TypeToken typeToken) {
Class rawType = typeToken.getRawType();
return (rawType == unboxed || rawType == boxed) ? (TypeAdapter) typeAdapter : null;
}
@Override public String toString() {
return "Factory[type=" + boxed.getName()
+ "+" + unboxed.getName() + ",adapter=" + typeAdapter + "]";
}
};
}
public static TypeAdapterFactory newFactoryForMultipleTypes(final Class base,
final Class sub, final TypeAdapter typeAdapter) {
return new TypeAdapterFactory() {
@SuppressWarnings("unchecked") // we use a runtime check to make sure the 'T's equal
@Override public TypeAdapter create(Gson gson, TypeToken typeToken) {
Class rawType = typeToken.getRawType();
return (rawType == base || rawType == sub) ? (TypeAdapter) typeAdapter : null;
}
@Override public String toString() {
return "Factory[type=" + base.getName()
+ "+" + sub.getName() + ",adapter=" + typeAdapter + "]";
}
};
}
/**
* Returns a factory for all subtypes of {@code typeAdapter}. We do a runtime check to confirm
* that the deserialized type matches the type requested.
*/
public static TypeAdapterFactory newTypeHierarchyFactory(
final Class clazz, final TypeAdapter typeAdapter) {
return new TypeAdapterFactory() {
@SuppressWarnings("unchecked")
@Override public TypeAdapter create(Gson gson, TypeToken typeToken) {
final Class requestedType = typeToken.getRawType();
if (!clazz.isAssignableFrom(requestedType)) {
return null;
}
return (TypeAdapter) new TypeAdapter() {
@Override public void write(JsonWriter out, T1 value) throws IOException {
typeAdapter.write(out, value);
}
@Override public T1 read(JsonReader in) throws IOException {
T1 result = typeAdapter.read(in);
if (result != null && !requestedType.isInstance(result)) {
throw new JsonSyntaxException("Expected a " + requestedType.getName()
+ " but was " + result.getClass().getName());
}
return result;
}
};
}
@Override public String toString() {
return "Factory[typeHierarchy=" + clazz.getName() + ",adapter=" + typeAdapter + "]";
}
};
}
}
