| /* |
| * 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 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; |
| 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.BitSet; |
| import java.util.Calendar; |
| import java.util.Date; |
| import java.util.GregorianCalendar; |
| import java.util.HashMap; |
| import java.util.Locale; |
| import java.util.Map; |
| import java.util.StringTokenizer; |
| import java.util.UUID; |
| |
| /** |
| * Type adapters for basic types. |
| */ |
| public final class TypeAdapters { |
| private TypeAdapters() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @SuppressWarnings("rawtypes") |
| public static final TypeAdapter<Class> CLASS = new TypeAdapter<Class>() { |
| @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<BitSet> BIT_SET = new TypeAdapter<BitSet>() { |
| @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> BOOLEAN = new TypeAdapter<Boolean>() { |
| @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 { |
| if (value == null) { |
| out.nullValue(); |
| return; |
| } |
| out.value(value); |
| } |
| }; |
| |
| /** |
| * Writes a boolean as a string. Useful for map keys, where booleans aren't |
| * otherwise permitted. |
| */ |
| public static final TypeAdapter<Boolean> BOOLEAN_AS_STRING = new TypeAdapter<Boolean>() { |
| @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<Number> BYTE = new TypeAdapter<Number>() { |
| @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<Number> SHORT = new TypeAdapter<Number>() { |
| @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<Number> INTEGER = new TypeAdapter<Number>() { |
| @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<Number> LONG = new TypeAdapter<Number>() { |
| @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<Number> FLOAT = new TypeAdapter<Number>() { |
| @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<Number> DOUBLE = new TypeAdapter<Number>() { |
| @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> NUMBER = new TypeAdapter<Number>() { |
| @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> CHARACTER = new TypeAdapter<Character>() { |
| @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> STRING = new TypeAdapter<String>() { |
| @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<BigDecimal> BIG_DECIMAL = new TypeAdapter<BigDecimal>() { |
| @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<BigInteger> BIG_INTEGER = new TypeAdapter<BigInteger>() { |
| @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<StringBuilder> STRING_BUILDER = new TypeAdapter<StringBuilder>() { |
| @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<StringBuffer> STRING_BUFFER = new TypeAdapter<StringBuffer>() { |
| @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> URL = new TypeAdapter<URL>() { |
| @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> URI = new TypeAdapter<URI>() { |
| @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<InetAddress> INET_ADDRESS = new TypeAdapter<InetAddress>() { |
| @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> UUID = new TypeAdapter<UUID>() { |
| @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 TypeAdapterFactory TIMESTAMP_FACTORY = new TypeAdapterFactory() { |
| @SuppressWarnings("unchecked") // we use a runtime check to make sure the 'T's equal |
| @Override public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> typeToken) { |
| if (typeToken.getRawType() != Timestamp.class) { |
| return null; |
| } |
| |
| final TypeAdapter<Date> dateTypeAdapter = gson.getAdapter(Date.class); |
| return (TypeAdapter<T>) new TypeAdapter<Timestamp>() { |
| @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> CALENDAR = new TypeAdapter<Calendar>() { |
| 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> LOCALE = new TypeAdapter<Locale>() { |
| @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<JsonElement> JSON_ELEMENT = new TypeAdapter<JsonElement>() { |
| @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<String, JsonElement> 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<T extends Enum<T>> extends TypeAdapter<T> { |
| private final Map<String, T> nameToConstant = new HashMap<String, T>(); |
| private final Map<T, String> constantToName = new HashMap<T, String>(); |
| |
| public EnumTypeAdapter(Class<T> 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(); |
| } |
| } |
| @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 <T> TypeAdapter<T> create(Gson gson, TypeToken<T> typeToken) { |
| Class<? super T> rawType = typeToken.getRawType(); |
| if (!Enum.class.isAssignableFrom(rawType) || rawType == Enum.class) { |
| return null; |
| } |
| if (!rawType.isEnum()) { |
| rawType = rawType.getSuperclass(); // handle anonymous subclasses |
| } |
| return (TypeAdapter<T>) new EnumTypeAdapter(rawType); |
| } |
| }; |
| |
| public static <TT> TypeAdapterFactory newFactory( |
| final TypeToken<TT> type, final TypeAdapter<TT> typeAdapter) { |
| return new TypeAdapterFactory() { |
| @SuppressWarnings("unchecked") // we use a runtime check to make sure the 'T's equal |
| @Override public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> typeToken) { |
| return typeToken.equals(type) ? (TypeAdapter<T>) typeAdapter : null; |
| } |
| }; |
| } |
| |
| public static <TT> TypeAdapterFactory newFactory( |
| final Class<TT> type, final TypeAdapter<TT> typeAdapter) { |
| return new TypeAdapterFactory() { |
| @SuppressWarnings("unchecked") // we use a runtime check to make sure the 'T's equal |
| @Override public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> typeToken) { |
| return typeToken.getRawType() == type ? (TypeAdapter<T>) typeAdapter : null; |
| } |
| @Override public String toString() { |
| return "Factory[type=" + type.getName() + ",adapter=" + typeAdapter + "]"; |
| } |
| }; |
| } |
| |
| public static <TT> TypeAdapterFactory newFactory( |
| final Class<TT> unboxed, final Class<TT> boxed, final TypeAdapter<? super TT> typeAdapter) { |
| return new TypeAdapterFactory() { |
| @SuppressWarnings("unchecked") // we use a runtime check to make sure the 'T's equal |
| @Override public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> typeToken) { |
| Class<? super T> rawType = typeToken.getRawType(); |
| return (rawType == unboxed || rawType == boxed) ? (TypeAdapter<T>) typeAdapter : null; |
| } |
| @Override public String toString() { |
| return "Factory[type=" + boxed.getName() |
| + "+" + unboxed.getName() + ",adapter=" + typeAdapter + "]"; |
| } |
| }; |
| } |
| |
| public static <TT> TypeAdapterFactory newFactoryForMultipleTypes(final Class<TT> base, |
| final Class<? extends TT> sub, final TypeAdapter<? super TT> typeAdapter) { |
| return new TypeAdapterFactory() { |
| @SuppressWarnings("unchecked") // we use a runtime check to make sure the 'T's equal |
| @Override public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> typeToken) { |
| Class<? super T> rawType = typeToken.getRawType(); |
| return (rawType == base || rawType == sub) ? (TypeAdapter<T>) 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 <T1> TypeAdapterFactory newTypeHierarchyFactory( |
| final Class<T1> clazz, final TypeAdapter<T1> typeAdapter) { |
| return new TypeAdapterFactory() { |
| @SuppressWarnings("unchecked") |
| @Override public <T2> TypeAdapter<T2> create(Gson gson, TypeToken<T2> typeToken) { |
| final Class<? super T2> requestedType = typeToken.getRawType(); |
| if (!clazz.isAssignableFrom(requestedType)) { |
| return null; |
| } |
| return (TypeAdapter<T2>) new TypeAdapter<T1>() { |
| @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 + "]"; |
| } |
| }; |
| } |
| } |