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better control of failure in node seek of kelondroTree

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git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@2686 6c8d7289-2bf4-0310-a012-ef5d649a1542
This commit is contained in:
orbiter 2006-10-02 00:13:19 +00:00
parent ca8ef0ca9f
commit b033a80750
1 changed files with 96 additions and 80 deletions
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44
source/de/anomic/kelondro/kelondroTree.java
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@ -270,7 +270,10 @@ public class kelondroTree extends kelondroRecords implements kelondroIndex {
private Node thenode, parentnode;
private boolean found; // property if node was found
private byte child; // -1: left child; 0: root node; 1: right child
// temporary variables
private Handle thisHandle;
byte[] keybuffer;
protected Search() {
}
@ -282,6 +285,8 @@ public class kelondroTree extends kelondroRecords implements kelondroIndex {
thisHandle = getHandle(root);
parentnode = null;
if (key == null) {
throw new kelondroException("startet search process with key == null");
/*
child = 0;
if (thisHandle == null) {
thenode = null;
@ -290,13 +295,15 @@ public class kelondroTree extends kelondroRecords implements kelondroIndex {
thenode = getNode(thisHandle, null, 0);
found = true;
}
} else {
return;
*/
}
thenode = null;
child = 0;
found = false;
int c;
byte[] k;
TreeSet visitedNodeKeys = new TreeSet(loopDetectionOrder); // to detect loops
TreeMap visitedNodeKeys = new TreeMap(loopDetectionOrder); // to detect loops
// System.out.println("Starting Compare Loop in Database " + filename); // debug
while (thisHandle != null) {
try {
@ -307,15 +314,25 @@ public class kelondroTree extends kelondroRecords implements kelondroIndex {
found = false;
return;
}
if (thenode == null) {
throw new kelondroException(filename, "kelondroTree.Search.process: thenode==null");
}
k = thenode.getKey();
if (k == null) {
if (thenode == null) throw new kelondroException(filename, "kelondroTree.Search.process: thenode==null");
keybuffer = thenode.getKey();
if (keybuffer == null) {
// this is an error. distinguish two cases:
// 1. thenode is a leaf node. Then this error can be fixed if we can consider this node as a good node to be replaced with a new value
// 2. thenode is not a leaf node. An exception must be thrown
if ((thenode.getOHHandle(leftchild) == null) && (thenode.getOHHandle(rightchild) == null)) {
// case 1: recover
deleteNode(thisHandle);
thenode = parentnode;
found = false;
return;
} else {
// case 2: fail
throw new kelondroException("found key during search process with key == null");
}
if (visitedNodeKeys.contains(k)) {
}
if (visitedNodeKeys.containsKey(keybuffer)) {
// we have loops in the database.
// to fix this, all affected nodes must be patched
thenode.setOHByte(magic, (byte) 1);
@ -329,7 +346,7 @@ public class kelondroTree extends kelondroRecords implements kelondroIndex {
return;
}
// System.out.println("Comparing key = '" + new String(key) + "' with '" + otherkey + "':"); // debug
c = objectOrder.compare(key, k);
c = objectOrder.compare(key, keybuffer);
// System.out.println(c); // debug
if (c == 0) {
found = true;
@ -342,8 +359,7 @@ public class kelondroTree extends kelondroRecords implements kelondroIndex {
child = 1;
thisHandle = thenode.getOHHandle(rightchild);
}
visitedNodeKeys.add(k);
}
visitedNodeKeys.put(keybuffer, null);
}
// System.out.println("DEBUG: search for " + new String(key) + " ended with status=" + ((found) ? "found" : "not-found") + ", node=" + ((thenode == null) ? "NULL" : thenode.toString()) + ", parent=" + ((parentnode == null) ? "NULL" : parentnode.toString()));
// we reached a node where we must insert the new value
@ -442,10 +458,10 @@ public class kelondroTree extends kelondroRecords implements kelondroIndex {
// check consistency and link new node to parent node
byte parentBalance;
if (writeSearchObj.isLeft()) {
if (parentNode.getOHHandle(leftchild) != null) throw new kelondroException(filename, "tried to create leftchild node twice");
if (parentNode.getOHHandle(leftchild) != null) throw new kelondroException(filename, "tried to create leftchild node twice. parent=" + new String(parentNode.getKey()) + ", leftchild=" + new String(new Node(parentNode.getOHHandle(leftchild), (Node) null, 0).getKey()));
parentNode.setOHHandle(leftchild, theNode.handle());
} else if (writeSearchObj.isRight()) {
if (parentNode.getOHHandle(rightchild) != null) throw new kelondroException(filename, "tried to create rightchild node twice");
if (parentNode.getOHHandle(rightchild) != null) throw new kelondroException(filename, "tried to create rightchild node twice. parent=" + new String(parentNode.getKey()) + ", rightchild=" + new String(new Node(parentNode.getOHHandle(rightchild), (Node) null, 0).getKey()));
parentNode.setOHHandle(rightchild, theNode.handle());
} else {
throw new kelondroException(filename, "neither left nor right child");