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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.databind.JavaType;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.annotation.JacksonStdImpl;
import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonFormatVisitorWrapper;
import com.fasterxml.jackson.databind.jsontype.TypeSerializer;

/**
 * Simple general purpose serializer, useful for any
 * type for which {@link Object#toString} returns the desired JSON
 * value.
 */
@JacksonStdImpl
@SuppressWarnings("serial")
public class ToStringSerializer
    extends StdSerializer
{
    /**
     * Singleton instance to use.
     */
    public final static ToStringSerializer instance = new ToStringSerializer();

    /**
     *

* Note: usually you should NOT create new instances, but instead use * {@link #instance} which is stateless and fully thread-safe. However, * there are cases where constructor is needed; for example, * when using explicit serializer annotations like * {@link com.fasterxml.jackson.databind.annotation.JsonSerialize#using}. */ public ToStringSerializer() { super(Object.class); } /** * Sometimes it may actually make sense to retain actual handled type, so... * * @since 2.5 */ public ToStringSerializer(Class handledType) { super(handledType, false); } @Override public boolean isEmpty(SerializerProvider prov, Object value) { if (value == null) { return true; } String str = value.toString(); return str.isEmpty(); } @Override public void serialize(Object value, JsonGenerator gen, SerializerProvider provider) throws IOException { gen.writeString(value.toString()); } /* 01-Mar-2011, tatu: We were serializing as "raw" String; but generally that * is not what we want, since lack of type information would imply real * String type. */ /** * Default implementation will write type prefix, call regular serialization * method (since assumption is that value itself does not need JSON * Array or Object start/end markers), and then write type suffix. * This should work for most cases; some sub-classes may want to * change this behavior. */ @Override public void serializeWithType(Object value, JsonGenerator gen, SerializerProvider provider, TypeSerializer typeSer) throws IOException { typeSer.writeTypePrefixForScalar(value, gen); serialize(value, gen, provider); typeSer.writeTypeSuffixForScalar(value, gen); } @Override public JsonNode getSchema(SerializerProvider provider, Type typeHint) throws JsonMappingException { return createSchemaNode("string", true); } @Override public void acceptJsonFormatVisitor(JsonFormatVisitorWrapper visitor, JavaType typeHint) throws JsonMappingException { visitStringFormat(visitor, typeHint); } }