antville/helma
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Added support for "groupby" nodes

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hns 2001-01-02 15:28:56 +00:00
parent 343e354c77
commit 218db60353
2 changed files with 43 additions and 8 deletions
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36
src/helma/objectmodel/db/Node.java
View file

@ -746,6 +746,25 @@ public class Node implements INode, Serializable {
return retval;
}
public Node getGroupbySubnode (String sid, Relation rel) {
loadNodes ();
if (subnodes.contains (sid)) {
Node node = new Node (this, sid, nmgr, null);
DbMapping dbm = new DbMapping ();
dbm.setSubnodeMapping (rel.other);
dbm.setSubnodeRelation (rel.getGroupbySubnodeRelation());
dbm.setPropertyMapping (rel.other);
dbm.setPropertyRelation (rel.getGroupbyPropertyRelation());
node.setDbMapping (dbm);
String snrel = "WHERE "+rel.groupby +"='"+sid+"'";
if (dbm.getSubnodeRelation().direction == Relation.BACKWARD)
snrel += " AND "+dbm.getSubnodeRelation().remoteField+"='"+getNonVirtualHomeID()+"'";
node.setSubnodeRelation (snrel);
return node;
}
return null;
}
public boolean remove () {
checkWriteLock ();
if (anonymous)
@ -1639,5 +1658,22 @@ public class Node implements INode, Serializable {
return cacheNode;
}
// walk down node path to the first non-virtual node and return its id.
// limit max depth to 3, since there shouldn't be more then 2 layers of virtual nodes.
public String getNonVirtualHomeID () {
INode node = this;
for (int i=0; i<3; i++) {
if (node == null) break;
if (node.getState() != Node.VIRTUAL)
return node.getID ();
node = node.getParent ();
}
return null;
}
public void dumpSubnodes () {
System.err.println (subnodes);
}
}

15
src/helma/objectmodel/db/NodeManager.java
View file

@ -135,6 +135,7 @@ public final class NodeManager {
return null;
Key key = Key.makeKey (dbmap, kstr);
Transactor tx = (Transactor) Thread.currentThread ();
// tx.timer.beginEvent ("getNode "+kstr);
@ -497,7 +498,7 @@ public final class NodeManager {
} else {
String q = "SELECT "+idfield+" FROM "+table;
if (subrel.direction == Relation.BACKWARD) {
String homeid = home.getState() == Node.VIRTUAL ? home.parentID : home.getID ();
String homeid = home.getNonVirtualHomeID (); // home.getState() == Node.VIRTUAL ? home.parentID : home.getID ();
q += " WHERE "+subrel.remoteField+" = '"+homeid+"'";
}
// set order, if specified and if not using subnode's relation
@ -678,6 +679,7 @@ public final class NodeManager {
}
private Node getNodeByRelation (DbWrapper db, DbTxn txn, Node home, String kstr, Relation rel) throws Exception {
Node node = null;
if (rel != null && rel.virtual && home.getState() != INode.VIRTUAL) {
Key k = home.getKey ().getVirtualKey (kstr);
@ -687,6 +689,7 @@ public final class NodeManager {
node.setString ("prototype", rel.prototype);
return node;
}
// if subnodes are stored in embedded db we have to actually assign it the virtual node,
// otherwise it and its subnodes will be lost across restarts.
if (rel.other == null || (!rel.other.isRelational() && !home.getDbMapping().isRelational())) {
@ -707,14 +710,9 @@ public final class NodeManager {
dbm.setPropertyRelation (rel.getVirtualPropertyRelation());
node.setDbMapping (dbm);
}
} else if (rel != null && rel.groupby != null) {
node = new Node (home, kstr, safe, rel.prototype);
DbMapping dbm = new DbMapping ();
dbm.setSubnodeMapping (rel.other);
dbm.setSubnodeRelation (rel.getGroupbySubnodeRelation());
dbm.setPropertyMapping (rel.other);
dbm.setPropertyRelation (rel.getGroupbyPropertyRelation());
node.setDbMapping (dbm);
return home.getGroupbySubnode (kstr, rel);
} else if (rel == null || rel.other == null || !rel.other.isRelational ()) {
node = db.getNode (txn, kstr);
node.nmgr = safe;
@ -805,6 +803,7 @@ public final class NodeManager {
return sbuf.toString ();
}
}