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/**
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 com.agfa.hap.sdo;
import java.util.Iterator;
/**
* {@link SnapshotDefinition} that includes everything that is reachable
* from the root object.
* starting from the root object all child properties are visited
* properties that are considered "proxy" by the datamapper are
* visited as proxies and will be serialized as sdo . (ie when using a HibernateDataMapper lazily retrieved objects that are "unitialized"
* will be serialized as a sdo proxy)
* @author AMOCZ
*/
public class ReachableDefinition implements SnapshotDefinition {
public <T> void visit(DataMapper<T> mapper, ObjectPropertyVisitor visitor, T root) throws Exception {
Type type = mapper.getType(root);
visitor.startDataObject(root, type);
for (Property p : type.getProperties()) {
try {
if (p.isMany()) {
Iterator<? extends T> it = mapper.getObjects(root, p);
while (it.hasNext()) {
visitChild(mapper, visitor, root, p, it.next());
}
} else {
visitChild(mapper, visitor, root, p, mapper.getProperty(root, p));
}
} catch (PropertyNotAvailableException e) {
// ok;
}
}
visitor.endDataObject(root, type);
}
private <T> void visitChild(DataMapper<T> mapper, ObjectPropertyVisitor visitor, T parent, Property property, Object value) throws Exception {
if (value != null) {
if (!property.getType().isDataType()) {
T child = (T) value;
if (mapper.isProxy(child)) {
Type childType = mapper.getType(child);
Object identity = mapper.getProperty(child, childType.getIdentityProperty());
visitor.visitProxyProperty(parent, property, identity);
return;
}
}
boolean recurse = visitor.visitProperty(parent, property, value);
if (recurse) {
visit(mapper, visitor, (T) value);
}
}
}
}
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