/*
* Copyright 2011 JBoss, by Red Hat, Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jboss.errai.marshalling.client.marshallers;
import java.util.Collection;
import org.jboss.errai.common.client.protocols.SerializationParts;
import org.jboss.errai.marshalling.client.api.Marshaller;
import org.jboss.errai.marshalling.client.api.MarshallingSession;
import org.jboss.errai.marshalling.client.api.json.EJArray;
import org.jboss.errai.marshalling.client.api.json.EJObject;
import org.jboss.errai.marshalling.client.api.json.EJValue;
import org.jboss.errai.marshalling.client.util.EncDecUtil;
/**
* @author Mike Brock
* @author Christian Sadilek <csadilek@redhat.com>
*/
public abstract class AbstractCollectionMarshaller<C extends Collection> extends AbstractBackReferencingMarshaller<C> {
@Override
public void doMarshall(final StringBuilder buf, final C o, final MarshallingSession ctx) {
EncDecUtil.arrayMarshall(buf, o, ctx);
}
@Override
public final C doDemarshall(final EJValue o, final MarshallingSession ctx) {
if (o.isNull()) return null;
final EJObject obj = o.isObject();
if (obj != null) {
final EJValue val = obj.get(SerializationParts.QUALIFIED_VALUE);
return doDemarshall(val.isArray(), ctx);
}
else {
return doDemarshall(o.isArray(), ctx);
}
}
public abstract C doDemarshall(final EJArray o, MarshallingSession ctx);
protected <T extends Collection<Object>> T marshallToCollection(final T collection,
final EJArray array,
final MarshallingSession ctx) {
if (array == null) return null;
final String assumedElementType = ctx.getAssumedElementType();
for (int i = 0; i < array.size(); i++) {
final EJValue elem = array.get(i);
if (!elem.isNull()) {
String type = null;
final EJObject jsonObject;
if ((jsonObject = elem.isObject()) != null) {
if (!jsonObject.containsKey(SerializationParts.ENCODED_TYPE)) {
// for collections with a concrete type parameter, we treat the ^EncodedType value as optional
type = assumedElementType;
}
}
else {
type = assumedElementType;
}
if (type == null) {
type = ctx.determineTypeFor(null, elem);
}
// the assumed element type can only be used once since it is not set for nested collections.
ctx.setAssumedElementType(null);
final Marshaller<Object> marshallerInstance = ctx.getMarshallerInstance(type);
if (marshallerInstance == null) {
throw new RuntimeException("no marshaller for type: " + type);
}
collection.add(marshallerInstance.demarshall(elem, ctx));
}
else {
collection.add(null);
}
}
return collection;
}
}