com.fasterxml.jackson.databind.module.SimpleDeserializers.java Source code

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Here is the source code for com.fasterxml.jackson.databind.module.SimpleDeserializers.java

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package com.fasterxml.jackson.databind.module;

import java.util.*;

import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.deser.Deserializers;
import com.fasterxml.jackson.databind.jsontype.TypeDeserializer;
import com.fasterxml.jackson.databind.type.*;

/**
 * Simple implementation {@link Deserializers} which allows registration of
 * deserializers based on raw (type erased class).
 * It can work well for basic bean and scalar type deserializers, but is not
 * a good fit for handling generic types (like {@link Map}s and {@link Collection}s
 * or array types).
 *<p>
 * Unlike {@link SimpleSerializers}, this class does not currently support generic mappings;
 * all mappings must be to exact declared deserialization type.
 */
public class SimpleDeserializers implements Deserializers, java.io.Serializable {
    private static final long serialVersionUID = -3006673354353448880L;

    protected HashMap<ClassKey, JsonDeserializer<?>> _classMappings = null;

    /**
     * Flag to help find "generic" enum deserializer, if one has been registered.
     * 
     * @since 2.3
     */
    protected boolean _hasEnumDeserializer = false;

    /*
    /**********************************************************
    /* Life-cycle, construction and configuring
    /**********************************************************
     */

    public SimpleDeserializers() {
    }

    /**
     * @since 2.1
     */
    public SimpleDeserializers(Map<Class<?>, JsonDeserializer<?>> desers) {
        addDeserializers(desers);
    }

    public <T> void addDeserializer(Class<T> forClass, JsonDeserializer<? extends T> deser) {
        ClassKey key = new ClassKey(forClass);
        if (_classMappings == null) {
            _classMappings = new HashMap<ClassKey, JsonDeserializer<?>>();
        }
        _classMappings.put(key, deser);
        // [Issue#227]: generic Enum deserializer?
        if (forClass == Enum.class) {
            _hasEnumDeserializer = true;
        }
    }

    /**
     * @since 2.1
     */
    @SuppressWarnings("unchecked")
    public void addDeserializers(Map<Class<?>, JsonDeserializer<?>> desers) {
        for (Map.Entry<Class<?>, JsonDeserializer<?>> entry : desers.entrySet()) {
            Class<?> cls = entry.getKey();
            // what a mess... nominal generics safety...
            JsonDeserializer<Object> deser = (JsonDeserializer<Object>) entry.getValue();
            addDeserializer((Class<Object>) cls, deser);
        }
    }

    /*
    /**********************************************************
    /* Serializers implementation
    /**********************************************************
     */

    @Override
    public JsonDeserializer<?> findArrayDeserializer(ArrayType type, DeserializationConfig config,
            BeanDescription beanDesc, TypeDeserializer elementTypeDeserializer,
            JsonDeserializer<?> elementDeserializer) throws JsonMappingException {
        return (_classMappings == null) ? null : _classMappings.get(new ClassKey(type.getRawClass()));
    }

    @Override
    public JsonDeserializer<?> findBeanDeserializer(JavaType type, DeserializationConfig config,
            BeanDescription beanDesc) throws JsonMappingException {
        return (_classMappings == null) ? null : _classMappings.get(new ClassKey(type.getRawClass()));
    }

    @Override
    public JsonDeserializer<?> findCollectionDeserializer(CollectionType type, DeserializationConfig config,
            BeanDescription beanDesc, TypeDeserializer elementTypeDeserializer,
            JsonDeserializer<?> elementDeserializer) throws JsonMappingException {
        return (_classMappings == null) ? null : _classMappings.get(new ClassKey(type.getRawClass()));
    }

    @Override
    public JsonDeserializer<?> findCollectionLikeDeserializer(CollectionLikeType type, DeserializationConfig config,
            BeanDescription beanDesc, TypeDeserializer elementTypeDeserializer,
            JsonDeserializer<?> elementDeserializer) throws JsonMappingException {
        return (_classMappings == null) ? null : _classMappings.get(new ClassKey(type.getRawClass()));
    }

    @Override
    public JsonDeserializer<?> findEnumDeserializer(Class<?> type, DeserializationConfig config,
            BeanDescription beanDesc) throws JsonMappingException {
        if (_classMappings == null) {
            return null;
        }
        JsonDeserializer<?> deser = _classMappings.get(new ClassKey(type));
        if (deser == null) {
            if (_hasEnumDeserializer && type.isEnum()) {
                deser = _classMappings.get(new ClassKey(Enum.class));
            }
        }
        return deser;
    }

    @Override
    public JsonDeserializer<?> findMapDeserializer(MapType type, DeserializationConfig config,
            BeanDescription beanDesc, KeyDeserializer keyDeserializer, TypeDeserializer elementTypeDeserializer,
            JsonDeserializer<?> elementDeserializer) throws JsonMappingException {
        return (_classMappings == null) ? null : _classMappings.get(new ClassKey(type.getRawClass()));
    }

    @Override
    public JsonDeserializer<?> findMapLikeDeserializer(MapLikeType type, DeserializationConfig config,
            BeanDescription beanDesc, KeyDeserializer keyDeserializer, TypeDeserializer elementTypeDeserializer,
            JsonDeserializer<?> elementDeserializer) throws JsonMappingException {
        return (_classMappings == null) ? null : _classMappings.get(new ClassKey(type.getRawClass()));
    }

    @Override
    public JsonDeserializer<?> findTreeNodeDeserializer(Class<? extends JsonNode> nodeType,
            DeserializationConfig config, BeanDescription beanDesc) throws JsonMappingException {
        return (_classMappings == null) ? null : _classMappings.get(new ClassKey(nodeType));
    }
}