antville/helma
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Completely rewrite getSubnode().

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Aded isNullNode method
This commit is contained in:
hns 2001-08-04 11:40:24 +00:00
parent 8ef0a8c4e6
commit 157f7bba7f
1 changed files with 45 additions and 36 deletions
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69
src/helma/objectmodel/db/Node.java
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@ -23,7 +23,7 @@ import com.workingdogs.village.*;
* an external relational database.
*/
public class Node implements INode, Serializable {
public final class Node implements INode, Serializable {
// The handle to the node's parent
protected NodeHandle parentHandle;
@ -127,10 +127,11 @@ public class Node implements INode, Serializable {
static final long serialVersionUID = -3740339688506633675L;
/**
* This constructor is only used for instances of the NullNode subclass. Do not use for ordinary Nodes!<
* This constructor is only used for instances of the NullNode subclass. Do not use for ordinary Nodes.
*/
Node () {
created = lastmodified = System.currentTimeMillis ();
nmgr = null;
}
/**
@ -838,51 +839,52 @@ public class Node implements INode, Serializable {
links.add (fromHandle);
}
public INode getSubnode (String path) {
StringTokenizer st = new StringTokenizer (path, "/");
Node retval = this, runner;
while (st.hasMoreTokens () && retval != null) {
runner = retval;
String next = st.nextToken().trim().toLowerCase ();
if ("".equals (next)) {
retval = this;
} else {
runner.loadNodes ();
Relation srel = null;
DbMapping smap = null;
if (runner.dbmap != null) {
srel = runner.dbmap.getSubnodeRelation ();
smap = runner.dbmap.getSubnodeMapping ();
}
public INode getSubnode (String subid) {
// System.err.println ("GETSUBNODE : "+this+" > "+subid);
Node retval = null;
if ("".equals (subid)) {
return this;
} else if (subid != null) {
loadNodes ();
if (subnodes == null || subnodes.size() == 0)
return null;
// check if there is a group-by relation
NodeHandle nhandle = null;
if (srel != null && srel.groupby != null)
int l = subnodes.size ();
for (int i=0; i<l; i++) try {
NodeHandle shandle = (NodeHandle) subnodes.get (i);
if (subid.equals (shandle.getID ())) {
// System.err.println ("FOUND SUBNODE: "+shandle);
nhandle = shandle;
break;
}
} catch (Exception x) {
break;
}
/* if (srel != null && srel.groupby != null)
nhandle = new NodeHandle (new SyntheticKey (runner.getKey (), next));
else
nhandle = new NodeHandle (new DbKey (smap, next));
boolean found = runner.subnodes == null ? false : runner.subnodes.contains (nhandle);
boolean found = runner.subnodes == null ? false : runner.subnodes.contains (nhandle); */
if (!found) {
retval = null;
} else {
if (nhandle != null) {
retval = nhandle.getNode (nmgr);
}
if (retval != null && retval.parentHandle == null && !"root".equalsIgnoreCase (retval.getPrototype ())) {
retval.setParent (runner);
retval.setParent (this);
retval.anonymous = true;
}
}
if (retval == null) {
retval = (Node) runner.getNode (next, false);
}
/* if (retval == null) {
retval = (Node) getNode (subid, false);
} */
}
return retval;
}
public INode getSubnodeAt (int index) {
loadNodes ();
@ -1160,6 +1162,9 @@ public class Node implements INode, Serializable {
if (smap != null && smap.isRelational ()) {
// check if subnodes need to be reloaded
Relation subRel = dbmap.getSubnodeRelation ();
// can't do backward relation on transient subnodes
if (state == TRANSIENT && subRel.direction == Relation.BACKWARD)
return;
synchronized (this) {
long lastChange = subRel.aggressiveCaching ? lastSubnodeChange : smap.getLastDataChange ();
// also reload if the type mapping has changed.
@ -1766,6 +1771,10 @@ public class Node implements INode, Serializable {
return null;
}
public boolean isNullNode () {
return nmgr == null;
}
public void dump () {
System.err.println ("subnodes: "+subnodes);
System.err.println ("properties: "+propMap);