package com.jdroid.java.marshaller;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import com.jdroid.java.collections.Lists;
import com.jdroid.java.collections.Maps;
import com.jdroid.java.json.JSONArray;
public class MarshallerProvider {
private Map<Class<?>, Marshaller<Object, Object>> marshallers = Maps.newHashMap();
private Marshaller<Object, Object> defaultMarshaller = new DefaultMarshaller();
private MarshallerTypeEvaluator marshallerTypeEvaluator = new DefaultMarshallerTypeEvaluator();
private static final MarshallerProvider INSTANCE = new MarshallerProvider();
private MarshallerProvider() {
// singleton
}
/**
* @return The instance of this provider
*/
public static MarshallerProvider get() {
return MarshallerProvider.INSTANCE;
}
public Object marshall(Object object, MarshallerMode mode, Map<String, String> extras) {
if (object != null) {
if (object instanceof Collection<?>) {
Collection<?> collection = (Collection<?>)object;
List<Object> list = Lists.newArrayList();
for (Object each : collection) {
list.add(innerMarshall(each, mode, extras));
}
return new JSONArray(list);
} else {
return innerMarshall(object, mode, extras);
}
} else {
return null;
}
}
public Object innerMarshall(Object object, MarshallerMode mode, Map<String, String> extras) {
if (object != null) {
if (object instanceof Collection<?>) {
Collection<?> collection = (Collection<?>)object;
List<Object> list = Lists.newArrayList();
for (Object each : collection) {
list.add(innerMarshall(each, mode, extras));
}
return list;
} else {
return getMarshaller(object).marshall(object, mode, extras);
}
} else {
return null;
}
}
public Marshaller<Object, Object> getMarshaller(Object marshallerType) {
Class<?> clazz = marshallerTypeEvaluator.evaluate(marshallerType);
return marshallers.containsKey(clazz) ? marshallers.get(clazz) : defaultMarshaller;
}
public void setMarshallers(Map<Class<?>, Marshaller<Object, Object>> marshallers) {
this.marshallers = marshallers;
}
@SuppressWarnings("unchecked")
public void addMarshaller(Class<?> clazz, Marshaller<? extends Object, ? extends Object> marshaller) {
marshallers.put(clazz, (Marshaller<Object, Object>)marshaller);
}
public static interface MarshallerTypeEvaluator {
public Class<?> evaluate(Object marshallerType);
}
private class DefaultMarshallerTypeEvaluator implements MarshallerTypeEvaluator {
@Override
public Class<?> evaluate(Object marshallerType) {
return marshallerType.getClass();
};
}
public void setMarshallerTypeEvaluator(MarshallerTypeEvaluator marshallerTypeEvaluator) {
this.marshallerTypeEvaluator = marshallerTypeEvaluator;
}
public void setDefaultMarshaller(Marshaller<Object, Object> defaultMarshaller) {
this.defaultMarshaller = defaultMarshaller;
}
}