io.ebeaninternal.server.persist.MergeNode Maven / Gradle / Ivy
package io.ebeaninternal.server.persist;
import io.ebean.Query;
import io.ebean.bean.EntityBean;
import io.ebeaninternal.server.deploy.BeanDescriptor;
import io.ebeaninternal.server.deploy.BeanProperty;
import io.ebeaninternal.server.deploy.BeanPropertyAssoc;
import java.util.Collection;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;
/**
* Base class for merge nodes.
*/
abstract class MergeNode {
protected final String fullPath;
protected final BeanDescriptor targetDescriptor;
protected Map children;
MergeNode(String fullPath, BeanPropertyAssoc property) {
this.fullPath = fullPath;
this.targetDescriptor = property.getTargetDescriptor();
}
/**
* Perform the merge processing.
*/
abstract void merge(MergeRequest request);
/**
* Add a child node given the fullPath and relative path.
*/
MergeNode addChild(String fullPath, String path) {
MergeNode childNode = MergeHandler.createMergeNode(fullPath, targetDescriptor, path);
if (children == null) {
children = new LinkedHashMap<>();
}
children.put(path, childNode);
return childNode;
}
/**
* Return the node given the relative path.
*/
MergeNode get(String path) {
if (children != null) {
return children.get(path);
}
return null;
}
/**
* Return the outline beans as a map keyed by Id values.
*/
Map toMap(Collection outlines) {
Map outlineMap = new HashMap<>();
if (outlines != null) {
for (Object out : outlines) {
EntityBean outlineBean = (EntityBean) out;
Object outlineId = targetDescriptor.getId(outlineBean);
outlineMap.put(outlineId, outlineBean);
}
}
return outlineMap;
}
/**
* Add to the query to fetch the Ids values for the foreign keys basically.
*/
void addSelectId(Query query) {
BeanProperty idProperty = targetDescriptor.getIdProperty();
query.fetch(fullPath, idProperty.getName());
}
/**
* Cascade the merge processing if this has child nodes.
*/
protected void cascade(EntityBean entityBean, EntityBean outlineBean, MergeRequest request) {
if (children != null && !children.isEmpty()) {
MergeRequest sub = request.sub(entityBean, outlineBean);
for (MergeNode node : children.values()) {
node.merge(sub);
}
}
}
}