antville/helma
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very carefully introduced use of NodeHandle instead of key+dbmapping

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hns 2001-08-01 00:07:31 +00:00
parent 6ce443b2ed
commit 7231ec6224
1 changed files with 50 additions and 35 deletions
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85
src/helma/objectmodel/db/Property.java
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@ -24,7 +24,7 @@ public final class Property implements IProperty, Serializable, Cloneable {
protected long lvalue;
protected double dvalue;
protected String nvalueID;
private transient DbMapping dbm;
private transient NodeHandle nhandle;
protected Object jvalue;
protected int type;
@ -65,9 +65,6 @@ public final class Property implements IProperty, Serializable, Cloneable {
}
private void writeObject (ObjectOutputStream out) throws IOException {
// don't even start if this is a non-serializable Java object
if (type == JAVAOBJECT && jvalue != null && !(jvalue instanceof Serializable))
return;
out.writeUTF (propname);
out.writeObject (node);
out.writeInt (type);
@ -89,7 +86,10 @@ public final class Property implements IProperty, Serializable, Cloneable {
out.writeUTF (nvalueID);
break;
case JAVAOBJECT:
out.writeObject (jvalue);
if (jvalue != null && !(jvalue instanceof Serializable))
out.writeObject (null);
else
out.writeObject (jvalue);
break;
}
}
@ -194,8 +194,10 @@ public final class Property implements IProperty, Serializable, Cloneable {
unregisterNode ();
if (type == JAVAOBJECT)
this.jvalue = null;
registerNode (value);
type = NODE;
if (node.dbmap != null) {
Relation rel = node.dbmap.getPropertyRelation (propname);
if (rel != null && rel.other != null) {
@ -209,19 +211,21 @@ public final class Property implements IProperty, Serializable, Cloneable {
if (!rel.virtual && rel.direction == Relation.FORWARD) {
if (rel.usesPrimaryKey ()) {
this.nvalueID = value.getID ();
nhandle = new NodeHandle (value);
} else try {
this.nvalueID = value.getString (vmap.columnNameToProperty (rel.getRemoteField()).propname, false);
nhandle = null;
} catch (Exception x) {
throw new RuntimeException ("Can't set "+propname+" to "+value+": error retrieving target property");
}
this.dbm = null;
dirty = true;
return;
}
}
}
nhandle = new NodeHandle (value);
this.nvalueID = value == null ? null : value.getID ();
this.dbm = value == null ? null : value.getDbMapping ();
dirty = true;
}
@ -238,33 +242,38 @@ public final class Property implements IProperty, Serializable, Cloneable {
* If this was the "main" property for the node, also remove all other references.
*/
protected void unregisterNode () {
if (nvalueID != null) {
DbMapping nvmap = null;
Relation nvrel = null;
if (node.dbmap != null) {
nvmap = node.dbmap.getPropertyMapping (propname);
nvrel = node.dbmap.getPropertyRelation (propname);
}
Node nvalue = node.nmgr.getNode (nvalueID, nvmap);
if (nvalue == null)
return;
nvalue.checkWriteLock ();
// check if the property node is also a subnode
// BUG: this doesn't work because properties for subnode/properties are never stored and therefore
// never reused.
if (nvrel != null && nvrel.subnodesAreProperties) {
node.removeNode (nvalue);
}
// only need to call unregisterPropLink if the value node is not stored in a relational db
// also, getParent is heuristical/implicit for relational nodes, so we don't do deepRemoveNode
// based on that for relational nodes.
if (nvmap == null || !nvmap.isRelational()) {
if (!nvalue.isAnonymous() && propname.equals (nvalue.getName()) && this.node == nvalue.getParent()) {
// this is the "main" property of a named node, so handle this as a cascading delete.
nvalue.deepRemoveNode ();
} else {
nvalue.unregisterPropLink (this.node);
}
Node nvalue = null;
if (nhandle != null)
nvalue = nhandle.getNode ();
DbMapping nvmap = null;
Relation nvrel = null;
if (node.dbmap != null) {
nvmap = node.dbmap.getPropertyMapping (propname);
nvrel = node.dbmap.getPropertyRelation (propname);
}
if (nvalue == null)
nvalue = node.nmgr.getNode (nvalueID, nvmap);
if (nvalue == null)
return;
nvalue.checkWriteLock ();
// check if the property node is also a subnode
// BUG: this doesn't work because properties for subnode/properties are never stored and therefore
// never reused.
if (nvrel != null && nvrel.subnodesAreProperties) {
node.removeNode (nvalue);
}
// only need to call unregisterPropLink if the value node is not stored in a relational db
// also, getParent is heuristical/implicit for relational nodes, so we don't do deepRemoveNode
// based on that for relational nodes.
if (nvmap == null || !nvmap.isRelational()) {
if (!nvalue.isAnonymous() && propname.equals (nvalue.getName()) && this.node == nvalue.getParent()) {
// this is the "main" property of a named node, so handle this as a cascading delete.
nvalue.deepRemoveNode ();
} else {
nvalue.unregisterPropLink (this.node);
}
}
}
@ -331,7 +340,13 @@ public final class Property implements IProperty, Serializable, Cloneable {
}
public INode getNodeValue () {
if (nhandle != null) {
Node n = nhandle.getNode ();
if (n != null) return n;
}
DbMapping dbm = null;
//// PROVISIONAL
if (type == NODE && nvalueID != null) {
Relation rel = null;
if (dbm == null && node.dbmap != null) {