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Data Mapper package is a high-performance data binding package built on Jackson JSON processor

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package org.codehaus.jackson.map.introspect;

import java.lang.annotation.Annotation;
import java.util.ArrayList;
import java.util.List;

import org.codehaus.jackson.annotate.*;
import org.codehaus.jackson.map.AnnotationIntrospector;
import org.codehaus.jackson.map.BeanProperty;
import org.codehaus.jackson.map.JsonDeserializer;
import org.codehaus.jackson.map.JsonSerializer;
import org.codehaus.jackson.map.KeyDeserializer;
import org.codehaus.jackson.map.annotate.JsonCachable;
import org.codehaus.jackson.map.annotate.JsonDeserialize;
import org.codehaus.jackson.map.annotate.JsonFilter;
import org.codehaus.jackson.map.annotate.JsonSerialize;
import org.codehaus.jackson.map.annotate.JsonTypeIdResolver;
import org.codehaus.jackson.map.annotate.JsonTypeResolver;
import org.codehaus.jackson.map.annotate.JsonView;
import org.codehaus.jackson.map.annotate.NoClass;
import org.codehaus.jackson.map.jsontype.NamedType;
import org.codehaus.jackson.map.jsontype.TypeIdResolver;
import org.codehaus.jackson.map.jsontype.TypeResolverBuilder;
import org.codehaus.jackson.map.jsontype.impl.StdTypeResolverBuilder;
import org.codehaus.jackson.map.ser.impl.RawSerializer;
import org.codehaus.jackson.map.util.ClassUtil;
import org.codehaus.jackson.type.JavaType;

/**
 * {@link AnnotationIntrospector} implementation that handles standard
 * Jackson annotations.
 */
public class JacksonAnnotationIntrospector
    extends AnnotationIntrospector
{
    public JacksonAnnotationIntrospector() { }

    /*
    /**********************************************************
    /* General annotation properties
    /**********************************************************
     */

    @Override
    public boolean isHandled(Annotation ann)
    {
        Class acls = ann.annotationType();

        /* 16-May-2009, tatu: used to check this like so...
           final String JACKSON_PKG_PREFIX = "org.codehaus.jackson";

           Package pkg = acls.getPackage();
           return (pkg != null) && (pkg.getName().startsWith(JACKSON_PKG_PREFIX));
        */

        // but this is more reliable, now that we have tag annotation:
        return acls.getAnnotation(JacksonAnnotation.class) != null;
    }

    /*
    /**********************************************************
    /* General annotations
    /**********************************************************
     */

    @Override
    public String findEnumValue(Enum value)
    {
        return value.name();
    }
    
    /*
    /**********************************************************
    /* General class annotations
    /**********************************************************
     */

    @Override
    public Boolean findCachability(AnnotatedClass ac)
    {
        JsonCachable ann = ac.getAnnotation(JsonCachable.class);
        if (ann == null) {
            return null;
        }
        return ann.value() ? Boolean.TRUE : Boolean.FALSE;
    }

    @Override
    public String findRootName(AnnotatedClass ac)
    {
        // No annotation currently defined for this feature, so:
        return null;
    }

    @Override
    public String[] findPropertiesToIgnore(AnnotatedClass ac) {
        JsonIgnoreProperties ignore = ac.getAnnotation(JsonIgnoreProperties.class);
        return (ignore == null) ? null : ignore.value();
    }

    @Override
    public Boolean findIgnoreUnknownProperties(AnnotatedClass ac) {
        JsonIgnoreProperties ignore = ac.getAnnotation(JsonIgnoreProperties.class);
        return (ignore == null) ? null : ignore.ignoreUnknown();
    }

    @Override
    public Boolean isIgnorableType(AnnotatedClass ac) {
        JsonIgnoreType ignore = ac.getAnnotation(JsonIgnoreType.class);
        return (ignore == null) ? null : ignore.value();
    }

    @Override
    public Object findFilterId(AnnotatedClass ac)
    {
        JsonFilter ann = ac.getAnnotation(JsonFilter.class);
        if (ann != null) {
            String id = ann.value();
            // Empty String is same as not having annotation, to allow overrides
            if (id.length() > 0) {
                return id;
            }
        }
        return null;
    }
    
    /*
    /**********************************************************
    /* Property auto-detection
    /**********************************************************
     */
    
    @Override
    public VisibilityChecker findAutoDetectVisibility(AnnotatedClass ac,
        VisibilityChecker checker)
    {
        JsonAutoDetect ann = ac.getAnnotation(JsonAutoDetect.class);
        return (ann == null) ? checker : checker.with(ann);
    }

    /*
    /**********************************************************
    /* General member (field, method/constructor) annotations
    /**********************************************************
     */

    // @since 1.6
    @Override        
    public ReferenceProperty findReferenceType(AnnotatedMember member)
    {
        JsonManagedReference ref1 = member.getAnnotation(JsonManagedReference.class);
        if (ref1 != null) {
            return AnnotationIntrospector.ReferenceProperty.managed(ref1.value());
        }
        JsonBackReference ref2 = member.getAnnotation(JsonBackReference.class);
        if (ref2 != null) {
            return AnnotationIntrospector.ReferenceProperty.back(ref2.value());
        }
        return null;
    }
    
    /*
    /**********************************************************
    /* Class annotations for PM type handling (1.5+)
    /**********************************************************
     */
    
    @Override
    public TypeResolverBuilder findTypeResolver(AnnotatedClass ac, JavaType baseType)
    {
        return _findTypeResolver(ac, baseType);
    }

    /**
     * Since 1.7, it is possible to use {@link JsonTypeInfo} from a property too.
     */
    @Override
    public TypeResolverBuilder findPropertyTypeResolver(AnnotatedMember am, JavaType baseType)
    {
        /* As per definition of @JsonTypeInfo, should only apply to contents of container
         * (collection, map) types, not container types themselves:
         */
        if (baseType.isContainerType()) return null;
        // No per-member type overrides (yet)
        return _findTypeResolver(am, baseType);
    }

    /**
     * Since 1.7, it is possible to use {@link JsonTypeInfo} from a property too.
     */
    @Override
    public TypeResolverBuilder findPropertyContentTypeResolver(AnnotatedMember am, JavaType containerType)
    {
        /* First: let's ensure property is a container type: caller should have
         * verified but just to be sure
         */
        if (!containerType.isContainerType()) {
            throw new IllegalArgumentException("Must call method with a container type (got "+containerType+")");
        }
        return _findTypeResolver(am, containerType);
    }
    
    @Override
    public List findSubtypes(Annotated a)
    {
        JsonSubTypes t = a.getAnnotation(JsonSubTypes.class);
        if (t == null) return null;
        JsonSubTypes.Type[] types = t.value();
        ArrayList result = new ArrayList(types.length);
        for (JsonSubTypes.Type type : types) {
            result.add(new NamedType(type.value(), type.name()));
        }
        return result;
    }

    @Override        
    public String findTypeName(AnnotatedClass ac)
    {
        JsonTypeName tn = ac.getAnnotation(JsonTypeName.class);
        return (tn == null) ? null : tn.value();
    }

    /*
    /**********************************************************
    /* General method annotations
    /**********************************************************
    */

    @Override
    public boolean isIgnorableMethod(AnnotatedMethod m) {
        return _isIgnorable(m);
    }

    @Override
    public boolean isIgnorableConstructor(AnnotatedConstructor c) {
        return _isIgnorable(c);
    }

    /*
    /**********************************************************
    /* General field annotations
    /**********************************************************
     */

    @Override
    public boolean isIgnorableField(AnnotatedField f) {
        return _isIgnorable(f);
    }

    /*
    /**********************************************************
    /* Serialization: general annotations
    /**********************************************************
    */

    @Override
    public Object findSerializer(Annotated a, BeanProperty property)
    {
        /* 21-May-2009, tatu: Slight change; primary annotation is now
         *    @JsonSerialize; @JsonUseSerializer is deprecated
         */
        JsonSerialize ann = a.getAnnotation(JsonSerialize.class);
        if (ann != null) {
            Class> serClass = ann.using();
            if (serClass != JsonSerializer.None.class) {
                return serClass;
            }
        }
        
        /* 18=Oct-2010, tatu: [JACKSON-351] @JsonRawValue handled just here, for now;
         *  if we need to get raw indicator from other sources need to add
         *  separate accessor within {@link AnnotationIntrospector} interface.
         */
        JsonRawValue annRaw =  a.getAnnotation(JsonRawValue.class);
        if ((annRaw != null) && annRaw.value()) {
            // let's construct instance with nominal type:
            Class cls = a.getRawType();
            return new RawSerializer(cls);
        }       
        return null;
    }

    @SuppressWarnings("deprecation")
    @Override
    public JsonSerialize.Inclusion findSerializationInclusion(Annotated a, JsonSerialize.Inclusion defValue)
    {
        JsonSerialize ann = a.getAnnotation(JsonSerialize.class);
        if (ann != null) {
            return ann.include();
        }
        /* 23-May-2009, tatu: Will still support now-deprecated (as of 1.1)
         *   legacy annotation too:
         */
        JsonWriteNullProperties oldAnn = a.getAnnotation(JsonWriteNullProperties.class);
        if (oldAnn != null) {
            boolean writeNulls = oldAnn.value();
            return writeNulls ? JsonSerialize.Inclusion.ALWAYS : JsonSerialize.Inclusion.NON_NULL;
        }
        return defValue;
    }

    @Override
    public Class findSerializationType(Annotated am)
    {
        // Primary annotation, JsonSerialize
        JsonSerialize ann = am.getAnnotation(JsonSerialize.class);
        if (ann != null) {
            Class cls = ann.as();
            if (cls != NoClass.class) {
                return cls;
            }
        }
        return null;
    }
    
    @Override
    public JsonSerialize.Typing findSerializationTyping(Annotated a)
    {
        JsonSerialize ann = a.getAnnotation(JsonSerialize.class);
        return (ann == null) ? null : ann.typing();
    }

    @Override
    public Class[] findSerializationViews(Annotated a)
    {
        JsonView ann = a.getAnnotation(JsonView.class);
        return (ann == null) ? null : ann.value();
    }
    
    /*
    /**********************************************************
    /* Serialization: class annotations
    /**********************************************************
     */

    @Override
    public String[] findSerializationPropertyOrder(AnnotatedClass ac) {
        JsonPropertyOrder order = ac.getAnnotation(JsonPropertyOrder.class);
        return (order == null) ? null : order.value();
    }

    @Override
    public Boolean findSerializationSortAlphabetically(AnnotatedClass ac) {
        JsonPropertyOrder order = ac.getAnnotation(JsonPropertyOrder.class);
        return (order == null) ? null : order.alphabetic();
    }

    /*
    /**********************************************************
    /* Serialization: method annotations
    /**********************************************************
     */

    @SuppressWarnings("deprecation")
    @Override
    public String findGettablePropertyName(AnnotatedMethod am)
    {
        /* 22-May-2009, tatu: JsonProperty is the primary annotation
         *   to check for
         */
        JsonProperty pann = am.getAnnotation(JsonProperty.class);
        if (pann != null) {
            return pann.value();
        }
        /* 22-May-2009, tatu: JsonGetter is deprecated as of 1.1
         *    but still supported
         */
        JsonGetter ann = am.getAnnotation(JsonGetter.class);
        if (ann != null) {
            return ann.value();
        }
        /* 22-May-2009, tatu: And finally, JsonSerialize implies
         *   that there is a property, although doesn't define name
         */
        // 09-Apr-2010, tatu: Ditto for JsonView
        if (am.hasAnnotation(JsonSerialize.class) || am.hasAnnotation(JsonView.class)) {
            return "";
        }
        return null;
    }

    @Override
    public boolean hasAsValueAnnotation(AnnotatedMethod am)
    {
        JsonValue ann = am.getAnnotation(JsonValue.class);
        // value of 'false' means disabled...
        return (ann != null && ann.value());
    }

    /*
    /**********************************************************
    /* Serialization: field annotations
    /**********************************************************
    */

    @Override
    public String findSerializablePropertyName(AnnotatedField af)
    {
        JsonProperty pann = af.getAnnotation(JsonProperty.class);
        if (pann != null) {
            return pann.value();
        }
        // Also: having JsonSerialize implies it is such a property
        // 09-Apr-2010, tatu: Ditto for JsonView
        if (af.hasAnnotation(JsonSerialize.class) || af.hasAnnotation(JsonView.class)) {
            return "";
        }
        return null;
    }

    /*
    /**********************************************************
    /* Deserialization: general annotations
    /**********************************************************
     */

    @Override
    public Class> findDeserializer(Annotated a, BeanProperty property)
    {
        /* 21-May-2009, tatu: Slight change; primary annotation is now
         *    @JsonDeserialize; @JsonUseDeserializer is deprecated
         */
        JsonDeserialize ann = a.getAnnotation(JsonDeserialize.class);
        if (ann != null) {
            Class> deserClass = ann.using();
            if (deserClass != JsonDeserializer.None.class) {
                return deserClass;
            }
        }
        // 31-Jan-2010, tatus: @JsonUseDeserializer removed as of 1.5
        return null;
    }

    @Override
    public Class findKeyDeserializer(Annotated a)
    {
        JsonDeserialize ann = a.getAnnotation(JsonDeserialize.class);
        if (ann != null) {
            Class deserClass = ann.keyUsing();
            if (deserClass != KeyDeserializer.None.class) {
                return deserClass;
            }
        }
        return null;
    }

    @Override
    public Class> findContentDeserializer(Annotated a)
    {
        JsonDeserialize ann = a.getAnnotation(JsonDeserialize.class);
        if (ann != null) {
            Class> deserClass = ann.contentUsing();
            if (deserClass != JsonDeserializer.None.class) {
                return deserClass;
            }
        }
        return null;
    }

    @Override
    public Class findDeserializationType(Annotated am, JavaType baseType,
            String propName)
    {
        // Primary annotation, JsonDeserialize
        JsonDeserialize ann = am.getAnnotation(JsonDeserialize.class);
        if (ann != null) {
            Class cls = ann.as();
            if (cls != NoClass.class) {
                return cls;
            }
        }

        /* TODO: !!! 21-May-2009, tatu: JsonClass is deprecated; will need to
         *    drop support at a later point (for 2.0?)
         */
        @SuppressWarnings("deprecation")
        JsonClass oldAnn = am.getAnnotation(JsonClass.class);
        if (oldAnn != null) {
            @SuppressWarnings("deprecation")
            Class cls = oldAnn.value();
            if(cls != NoClass.class) {
                return cls;
            }
        }
        return null;
    }

    @Override
    public Class findDeserializationKeyType(Annotated am, JavaType baseKeyType,
            String propName)
    {
        // Primary annotation, JsonDeserialize
        JsonDeserialize ann = am.getAnnotation(JsonDeserialize.class);
        if (ann != null) {
            Class cls = ann.keyAs();
            if (cls != NoClass.class) {
                return cls;
            }
        }

        /* !!! 21-May-2009, tatu: JsonClass is deprecated; will need to
         *    drop support at a later point (for 2.0?)
         */
        @SuppressWarnings("deprecation")
        JsonKeyClass oldAnn = am.getAnnotation(JsonKeyClass.class);
        if (oldAnn != null) {
            @SuppressWarnings("deprecation")
            Class cls = oldAnn.value();
            if(cls != NoClass.class) {
                return cls;
            }
        }
        return null;
    }

    @SuppressWarnings("deprecation")
    @Override
    public Class findDeserializationContentType(Annotated am, JavaType baseContentType,
            String propName)
    {
        // Primary annotation, JsonDeserialize
        JsonDeserialize ann = am.getAnnotation(JsonDeserialize.class);
        if (ann != null) {
            Class cls = ann.contentAs();
            if (cls != NoClass.class) {
                return cls;
            }
        }

        /* !!! 21-May-2009, tatu: JsonClass is deprecated; will need to
         *    drop support at a later point (for 2.0?)
         */
        JsonContentClass oldAnn = am.getAnnotation(JsonContentClass.class);
        if (oldAnn != null) {
            Class cls = oldAnn.value();
            if(cls != NoClass.class) {
                return cls;
            }
        }
        return null;
    }

    /*
    /**********************************************************
    /* Deserialization: Method annotations
    /**********************************************************
     */

    @Override
    public String findSettablePropertyName(AnnotatedMethod am)
    {
        /* 16-Apr-2010, tatu: Existing priority (since 1.1) is that
         *   @JsonProperty is checked first; and @JsonSetter next.
         *   This is not quite optimal now that @JsonSetter is un-deprecated.
         *   However, it is better to have stable behavior rather than
         *   cause compatibility problems by fine-tuning.
         */
        JsonProperty pann = am.getAnnotation(JsonProperty.class);
        if (pann != null) {
            return pann.value();
        }
        JsonSetter ann = am.getAnnotation(JsonSetter.class);
        if (ann != null) {
            return ann.value();
        }
        /* 22-May-2009, tatu: And finally, JsonSerialize implies
         *   that there is a property, although doesn't define name
         */
        // 09-Apr-2010, tatu: Ditto for JsonView
    	if (am.hasAnnotation(JsonDeserialize.class) || am.hasAnnotation(JsonView.class)) {
            return "";
        }
        return null;
    }

    @Override
    public boolean hasAnySetterAnnotation(AnnotatedMethod am)
    {
        /* No dedicated disabling; regular @JsonIgnore used
         * if needs to be ignored (and if so, is handled prior
         * to this method getting called)
         */
        return am.hasAnnotation(JsonAnySetter.class);
    }

    @Override
    public boolean hasAnyGetterAnnotation(AnnotatedMethod am)
    {
        /* No dedicated disabling; regular @JsonIgnore used
         * if needs to be ignored (handled separately
         */
        return am.hasAnnotation(JsonAnyGetter.class);
    }
    
    @Override
    public boolean hasCreatorAnnotation(Annotated a)
    {
        /* No dedicated disabling; regular @JsonIgnore used
         * if needs to be ignored (and if so, is handled prior
         * to this method getting called)
         */
        return a.hasAnnotation(JsonCreator.class);
    }

    /*
    /**********************************************************
    /* Deserialization: field annotations
    /**********************************************************
     */

    @Override
    public String findDeserializablePropertyName(AnnotatedField af)
    {
        JsonProperty pann = af.getAnnotation(JsonProperty.class);
        if (pann != null) {
            return pann.value();
        }
        // Also: having JsonDeserialize implies it is such a property
        // 09-Apr-2010, tatu: Ditto for JsonView
        if (af.hasAnnotation(JsonDeserialize.class) || af.hasAnnotation(JsonView.class)) {
            return "";
        }
        return null;
    }

    /*
    /**********************************************************
    /* Deserialization: parameters annotations
    /**********************************************************
     */

    @Override
    public String findPropertyNameForParam(AnnotatedParameter param)
    {
        if (param != null) {
            JsonProperty pann = param.getAnnotation(JsonProperty.class);
            if (pann != null) {
                return pann.value();
            }
            /* And can not use JsonDeserialize as we can not use
             * name auto-detection (names of local variables including
             * parameters are not necessarily preserved in bytecode)
             */
        }
        return null;
    }

    /*
    /**********************************************************
    /* Helper methods
    /**********************************************************
     */

    protected boolean _isIgnorable(Annotated a)
    {
        JsonIgnore ann = a.getAnnotation(JsonIgnore.class);
        return (ann != null && ann.value());
    }

    /**
     * Helper method called to construct and initialize instance of {@link TypeResolverBuilder}
     * if given annotated element indicates one is needed.
     */
    protected TypeResolverBuilder _findTypeResolver(Annotated ann, JavaType baseType)
    {
        // First: maybe we have explicit type resolver?
        TypeResolverBuilder b;
        JsonTypeInfo info = ann.getAnnotation(JsonTypeInfo.class);
        JsonTypeResolver resAnn = ann.getAnnotation(JsonTypeResolver.class);
        if (resAnn != null) {
            /* 14-Aug-2010, tatu: not sure if this can ever happen normally, but unit
             *    tests were able to trigger this... so let's check:
             */
            if (info == null) {
                return null;
            }
            /* let's not try to force access override (would need to pass
             * settings through if we did, since that's not doable on some
             * platforms)
             */
            b = ClassUtil.createInstance(resAnn.value(), false);
        } else { // if not, use standard one, if indicated by annotations
            if (info == null || info.use() == JsonTypeInfo.Id.NONE) {
                return null;
            }
            b = _constructStdTypeResolverBuilder();
        }
        // Does it define a custom type id resolver?
        JsonTypeIdResolver idResInfo = ann.getAnnotation(JsonTypeIdResolver.class);
        TypeIdResolver idRes = (idResInfo == null) ? null
                : ClassUtil.createInstance(idResInfo.value(), true);
        if (idRes != null) { // [JACKSON-359]
            idRes.init(baseType);
        }
        b = b.init(info.use(), idRes);
        b = b.inclusion(info.include());
        b = b.typeProperty(info.property());
        return b;
    }

    /**
     * Helper method for constructing standard {@link TypeResolverBuilder}
     * implementation.
     * 
     * @since 1.7
     */
    protected StdTypeResolverBuilder _constructStdTypeResolverBuilder()
    {
        return new StdTypeResolverBuilder();
    }

}
    

    

    

            

    

            



    
    






    
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