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* Make setParent() return boolean true if the argument was accepted as new parent

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* Use setParentHandle() wherever we don't need the new parent to be checked
* Backpedal from change in previous commit to only set parent for non-relational
   nodes in addNode() and setNode().
This commit is contained in:
hns 2004-03-09 15:01:49 +00:00
parent b565d6a166
commit b173eb0200
1 changed files with 35 additions and 45 deletions
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80
src/helma/objectmodel/db/Node.java
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@ -113,7 +113,7 @@ public final class Node implements INode, Serializable {
*/
public Node(Node home, String propname, WrappedNodeManager nmgr, String prototype) {
this.nmgr = nmgr;
setParent(home);
setParentHandle(home.getHandle());
// this.dbmap = null;
// generate a key for the virtual node that can't be mistaken for a Database Key
@ -624,10 +624,11 @@ public final class Node implements INode, Serializable {
}
/**
* Register a node as parent of the present node. We can't refer to the node directly, so we use
* the ID + DB map combo.
* Register a node as parent of the present node. This performs a check
* to prevent cyclic parent paths. If the argument is accepted as parent,
* the method returns true. Otherwise, false is returned.
*/
protected void setParent(Node parent) {
protected boolean setParent(Node parent) {
// walk down parent node to see if we are in its parent chain.
// this is to prevent cyclic parent chains.
Node p = parent;
@ -636,14 +637,18 @@ public final class Node implements INode, Serializable {
if (p == this) {
// we found ourself in the argument node's parent chain -
// ignore request to make it our parent.
return;
return false;
}
}
parentHandle = (parent == null) ? null : parent.getHandle();
return true;
}
/**
* Set the parent handle which can be used to get the actual parent node.
* Set the parent handle which can be used to get the actual parent node.
* In contrast to <code>getParent()</code> this does not perform any
* cyclic parent chain checks, so it should only be used when one is sure
* the argument handle doesn't refer to a Node we are a parent of.
*/
public void setParentHandle(NodeHandle parent) {
parentHandle = parent;
@ -653,6 +658,8 @@ public final class Node implements INode, Serializable {
* This version of setParent additionally marks the node as anonymous or non-anonymous,
* depending on the string argument. This is the version called from the scripting framework,
* while the one argument version is called from within the objectmodel classes only.
*
* @deprecated use Helma _parent mapping instead
*/
public void setParent(Node parent, String propertyName) {
// we only do that for relational nodes.
@ -760,7 +767,7 @@ public final class Node implements INode, Serializable {
}
if (pn != null && pn.isParentOf(this)) {
setParent(pn);
setParentHandle(pn.getHandle());
lastParentSet = System.currentTimeMillis();
return pn;
@ -915,7 +922,7 @@ public final class Node implements INode, Serializable {
}
}
if (!node.isRelational() && node != this && !"root".equalsIgnoreCase(node.getPrototype())) {
if (node != this && !"root".equalsIgnoreCase(node.getPrototype())) {
// avoid calling getParent() because it would return bogus results
// for the not-anymore transient node
Node nparent = (node.parentHandle == null) ? null
@ -925,8 +932,9 @@ public final class Node implements INode, Serializable {
// transient while we are persistent, make this the nodes new parent.
if ((nparent == null) ||
((state != TRANSIENT) && (nparent.getState() == TRANSIENT))) {
node.setParent(this);
node.anonymous = true;
if (node.setParent(this)) {
node.anonymous = true;
}
}
}
}
@ -1095,8 +1103,9 @@ public final class Node implements INode, Serializable {
if ((retval != null) && (retval.parentHandle == null) &&
!"root".equalsIgnoreCase(retval.getPrototype())) {
retval.setParent(this);
retval.anonymous = true;
if (retval.setParent(this)) {
retval.anonymous = true;
}
}
}
@ -1125,8 +1134,9 @@ public final class Node implements INode, Serializable {
if ((retval != null) && (retval.parentHandle == null) &&
!"root".equalsIgnoreCase(retval.getPrototype())) {
retval.setParent(this);
retval.anonymous = true;
if (retval.setParent(this)) {
retval.anonymous = true;
}
}
}
@ -1320,7 +1330,7 @@ public final class Node implements INode, Serializable {
}
// mark the node as deleted
setParent(null);
setParentHandle(null);
markAs(DELETED);
}
@ -1648,7 +1658,7 @@ public final class Node implements INode, Serializable {
// consulting the NodeManager about it.
Node n = new Node(propname, rel.getPrototype(), nmgr);
n.setDbMapping(rel.getVirtualMapping());
n.setParent(this);
n.setParentHandle(this.getHandle());
setNode(propname, n);
return (Property) propMap.get(propname.toLowerCase());
}
@ -1661,37 +1671,16 @@ public final class Node implements INode, Serializable {
if (n != null) {
if ((n.parentHandle == null) &&
!"root".equalsIgnoreCase(n.getPrototype())) {
n.setParent(this);
n.name = propname;
n.anonymous = false;
if (n.setParent(this)) {
n.name = propname;
n.anonymous = false;
}
}
return new Property(propname, this, n);
}
}
}
// 3) try to get the property from the database via accessname, if defined
// (only do this if accessname or groupby is specified)
/* if (rel == null && dbmap != null && state != TRANSIENT) {
rel = dbmap.getSubnodeRelation();
if (rel != null && rel.createOnDemand()) {
Node n = nmgr.getNode(this, propname, rel);
if (n != null) {
if ((n.parentHandle == null) &&
!"root".equalsIgnoreCase(n.getPrototype())) {
n.setParent(this);
n.name = propname;
n.anonymous = false;
}
return new Property(propname, this, n);
}
}
} */
// 4) nothing to be found - return null
return null;
}
@ -2187,7 +2176,7 @@ public final class Node implements INode, Serializable {
// check if the main identity of this node is as a named property
// or as an anonymous node in a collection
if (!n.isRelational() && n != this && !"root".equalsIgnoreCase(n.getPrototype())) {
if (n != this && !"root".equalsIgnoreCase(n.getPrototype())) {
// avoid calling getParent() because it would return bogus results
// for the not-anymore transient node
Node nparent = (n.parentHandle == null) ? null
@ -2197,9 +2186,10 @@ public final class Node implements INode, Serializable {
// transient while we are persistent, make this the nodes new parent.
if ((nparent == null) ||
((state != TRANSIENT) && (nparent.getState() == TRANSIENT))) {
n.setParent(this);
n.setName(propname);
n.anonymous = false;
if (n.setParent(this)) {
n.setName(propname);
n.anonymous = false;
}
}
}