org.codehaus.jackson.map.introspect.BasicClassIntrospector Maven / Gradle / Ivy
package org.codehaus.jackson.map.introspect;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.*;
import org.codehaus.jackson.map.AnnotationIntrospector;
import org.codehaus.jackson.map.ClassIntrospector;
import org.codehaus.jackson.map.DeserializationConfig;
import org.codehaus.jackson.map.MapperConfig;
import org.codehaus.jackson.map.SerializationConfig;
import org.codehaus.jackson.map.type.TypeFactory;
import org.codehaus.jackson.map.util.ClassUtil;
import org.codehaus.jackson.type.JavaType;
public class BasicClassIntrospector
extends ClassIntrospector
{
/**
* Filter used to only include methods that have signature that is
* compatible with "getters": take no arguments, are non-static,
* and return something.
*/
public static class GetterMethodFilter
implements MethodFilter
{
public final static GetterMethodFilter instance = new GetterMethodFilter();
private GetterMethodFilter() { }
public boolean includeMethod(Method m)
{
return ClassUtil.hasGetterSignature(m);
}
}
/**
* Filter used to only include methods that have signature that is
* compatible with "setters": take one and only argument and
* are non-static.
*
* Actually, also need to include 2-arg methods to support
* "any setters"; as well as 0-arg getters as long as they
* return Collection or Map type.
*/
public static class SetterMethodFilter
implements MethodFilter
{
public final static SetterMethodFilter instance = new SetterMethodFilter();
public boolean includeMethod(Method m)
{
// First: we can't use static methods
if (Modifier.isStatic(m.getModifiers())) {
return false;
}
int pcount = m.getParameterTypes().length;
// Ok; multiple acceptable parameter counts:
switch (pcount) {
case 1:
// Regular setters take just one param, so include:
return true;
case 2:
/* 2-arg version only for "AnySetters"; they are not
* auto-detected, and need to have an annotation.
* However, due to annotation inheritance we do, we
* don't yet know if sub-classes might have annotations...
* so shouldn't leave out any methods quite yet.
*/
//if (m.getAnnotation(JsonAnySetter.class) != null) { ... }
return true;
}
return false;
}
}
/**
* Filter used if some getters (namely, once needed for "setterless
* collection injection") are also needed, not just setters.
*/
public final static class SetterAndGetterMethodFilter
extends SetterMethodFilter
{
public final static SetterAndGetterMethodFilter instance = new SetterAndGetterMethodFilter();
@Override
public boolean includeMethod(Method m)
{
if (super.includeMethod(m)) {
return true;
}
if (!ClassUtil.hasGetterSignature(m)) {
return false;
}
// but furthermore, only accept Collections & Maps, for now
Class rt = m.getReturnType();
if (Collection.class.isAssignableFrom(rt)
|| Map.class.isAssignableFrom(rt)) {
return true;
}
return false;
}
}
/*
/**********************************************************
/* Life cycle
/**********************************************************
*/
public final static BasicClassIntrospector instance = new BasicClassIntrospector();
public BasicClassIntrospector() { }
/*
/**********************************************************
/* Factory method impls
/**********************************************************
*/
@Override
public BasicBeanDescription forSerialization(SerializationConfig cfg,
JavaType type, MixInResolver r)
{
AnnotationIntrospector ai = cfg.getAnnotationIntrospector();
AnnotatedClass ac = AnnotatedClass.construct(type.getRawClass(), ai, r);
// False -> no need to collect ignorable member list
ac.resolveMemberMethods(getSerializationMethodFilter(cfg), false);
/* only the default constructor needed here (that's needed
* in case we need to check default bean property values,
* to omit them)
*/
/* 31-Oct-2009, tatus: Actually, creator info will come in handy
* for resolving [JACKSON-170] as well
*/
ac.resolveCreators(true);
// False -> no need to collect ignorable field list
ac.resolveFields(false);
return new BasicBeanDescription(type, ac, ai);
}
@Override
public BasicBeanDescription forDeserialization(DeserializationConfig cfg,
JavaType type,
MixInResolver r)
{
AnnotationIntrospector ai = cfg.getAnnotationIntrospector();
AnnotatedClass ac = AnnotatedClass.construct(type.getRawClass(), ai, r);
// everything needed for deserialization, including ignored methods
ac.resolveMemberMethods(getDeserializationMethodFilter(cfg), true);
// include all kinds of creator methods:
ac.resolveCreators(true);
// yes, we need info on ignored fields as well
ac.resolveFields(true);
return new BasicBeanDescription(type, ac, ai);
}
@Override
public BasicBeanDescription forCreation(DeserializationConfig cfg,
JavaType type, MixInResolver r)
{
AnnotationIntrospector ai = cfg.getAnnotationIntrospector();
AnnotatedClass ac = AnnotatedClass.construct(type.getRawClass(), ai, r);
ac.resolveCreators(true);
return new BasicBeanDescription(type, ac, ai);
}
@Override
public BasicBeanDescription forClassAnnotations(MapperConfig cfg,
Class c, MixInResolver r)
{
AnnotationIntrospector ai = cfg.getAnnotationIntrospector();
AnnotatedClass ac = AnnotatedClass.construct(c, ai, r);
return new BasicBeanDescription(TypeFactory.type(c), ac, ai);
}
@Override
public BasicBeanDescription forDirectClassAnnotations(MapperConfig cfg,
Class c, MixInResolver r)
{
AnnotationIntrospector ai = cfg.getAnnotationIntrospector();
AnnotatedClass ac = AnnotatedClass.constructWithoutSuperTypes(c, ai, r);
return new BasicBeanDescription(TypeFactory.type(c), ac, ai);
}
/*
/**********************************************************
/* Overridable helper methods
/**********************************************************
*/
/**
* Helper method for getting access to filter that only guarantees
* that methods used for serialization are to be included.
*/
protected MethodFilter getSerializationMethodFilter(SerializationConfig cfg)
{
return GetterMethodFilter.instance;
}
/**
* Helper method for getting access to filter that only guarantees
* that methods used for deserialization are to be included.
*/
protected MethodFilter getDeserializationMethodFilter(DeserializationConfig cfg)
{
/* [JACKSON-88]: may also need to include getters (at least for
* Collection and Map types)
*/
if (cfg.isEnabled(DeserializationConfig.Feature.USE_GETTERS_AS_SETTERS)) {
return SetterAndGetterMethodFilter.instance;
}
return SetterMethodFilter.instance;
}
}