| package com.fasterxml.jackson.databind.ser.std; |
| |
| import java.io.IOException; |
| import java.lang.reflect.Type; |
| |
| import com.fasterxml.jackson.core.*; |
| import com.fasterxml.jackson.core.io.SerializedString; |
| import com.fasterxml.jackson.core.type.JavaType; |
| |
| import org.codehaus.jackson.node.ObjectNode; |
| import org.codehaus.jackson.node.ArrayNode; |
| |
| import com.fasterxml.jackson.databind.*; |
| import com.fasterxml.jackson.databind.annotate.JacksonStdImpl; |
| import com.fasterxml.jackson.databind.introspect.BasicBeanDescription; |
| import com.fasterxml.jackson.databind.util.EnumValues; |
| |
| /** |
| * Standard serializer used for {@link java.lang.Enum} types. |
| *<p> |
| * Based on {@link ScalarSerializerBase} since the JSON value is |
| * scalar (String). |
| * |
| * @author tatu |
| */ |
| @JacksonStdImpl |
| public class EnumSerializer |
| extends ScalarSerializerBase<Enum<?>> |
| { |
| /** |
| * This map contains pre-resolved values (since there are ways |
| * to customize actual String constants to use) to use as |
| * serializations. |
| */ |
| protected final EnumValues _values; |
| |
| public EnumSerializer(EnumValues v) { |
| super(Enum.class, false); |
| _values = v; |
| } |
| |
| public static EnumSerializer construct(Class<Enum<?>> enumClass, SerializationConfig config, |
| BasicBeanDescription beanDesc) |
| { |
| // [JACKSON-212]: If toString() is to be used instead, leave EnumValues null |
| AnnotationIntrospector intr = config.getAnnotationIntrospector(); |
| EnumValues v = config.isEnabled(SerializationConfig.Feature.WRITE_ENUMS_USING_TO_STRING) |
| ? EnumValues.constructFromToString(enumClass, intr) : EnumValues.constructFromName(enumClass, intr); |
| return new EnumSerializer(v); |
| } |
| |
| @Override |
| public final void serialize(Enum<?> en, JsonGenerator jgen, SerializerProvider provider) |
| throws IOException, JsonGenerationException |
| { |
| // [JACKSON-684]: serialize as index? |
| if (provider.isEnabled(SerializationConfig.Feature.WRITE_ENUMS_USING_INDEX)) { |
| jgen.writeNumber(en.ordinal()); |
| return; |
| } |
| jgen.writeString(_values.serializedValueFor(en)); |
| } |
| |
| @Override |
| public JsonNode getSchema(SerializerProvider provider, Type typeHint) |
| { |
| // [JACKSON-684]: serialize as index? |
| if (provider.isEnabled(SerializationConfig.Feature.WRITE_ENUMS_USING_INDEX)) { |
| return createSchemaNode("integer", true); |
| } |
| ObjectNode objectNode = createSchemaNode("string", true); |
| if (typeHint != null) { |
| JavaType type = provider.constructType(typeHint); |
| if (type.isEnumType()) { |
| ArrayNode enumNode = objectNode.putArray("enum"); |
| for (SerializedString value : _values.values()) { |
| enumNode.add(value.getValue()); |
| } |
| } |
| } |
| return objectNode; |
| } |
| |
| public EnumValues getEnumValues() { return _values; } |
| } |
| |