antville/helma
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Implement doGenerateID() that can safely be called by IDGenerator

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without causing infinite recursion.
This commit is contained in:
hns 2005-03-21 15:38:26 +00:00
parent a37a4e9216
commit 60b61d63ca
1 changed files with 43 additions and 23 deletions
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66
src/helma/objectmodel/db/NodeManager.java
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@ -709,10 +709,51 @@ public final class NodeManager {
node.setState(Node.INVALID);
}
/**
* Generate a new ID for a given type, delegating to our IDGenerator if set.
*/
public String generateID(DbMapping map) throws Exception {
if (idgen != null) {
// use our custom IDGenerator
return idgen.generateID(map);
} else {
return doGenerateID(map);
}
}
/**
* Actually generates an ID, using a method matching the given DbMapping.
*/
public String doGenerateID(DbMapping map) throws Exception {
if ((map == null) || !map.isRelational()) {
// use embedded db id generator
return generateEmbeddedID(map);
}
String idMethod = map.getIDgen();
if (idMethod == null || "[max]".equalsIgnoreCase(idMethod)) {
// use select max as id generator
return generateMaxID(map);
} else if ("[hop]".equalsIgnoreCase(idMethod)) {
// use embedded db id generator
return generateEmbeddedID(map);
} else {
// use db sequence as id generator
return generateSequenceID(map);
}
}
/**
* Gererates an ID for use with the embedded database.
*/
synchronized String generateEmbeddedID(DbMapping map) throws Exception {
return db.nextID();
}
/**
* Generates an ID for the table by finding out the maximum current value
*/
public synchronized String generateMaxID(DbMapping map)
synchronized String generateMaxID(DbMapping map)
throws Exception {
// Transactor tx = (Transactor) Thread.currentThread ();
// tx.timer.beginEvent ("generateID "+map);
@ -762,28 +803,7 @@ public final class NodeManager {
return retval;
}
/**
* Generate a new ID for a given type.
*/
public String generateID(DbMapping map) throws Exception {
if (idgen != null) {
// use our custom IDGenerator
return idgen.generateID(map);
} else if ((map == null) || !map.isRelational() ||
"[hop]".equalsIgnoreCase(map.getIDgen())) {
// use embedded db id generator
return db.nextID();
} else if ((map.getIDgen() == null) ||
"[max]".equalsIgnoreCase(map.getIDgen())) {
// use select max as id generator
return generateMaxID(map);
} else {
// use db sequence as id generator
return generateSequenceID(map);
}
}
public String generateSequenceID(DbMapping map) throws Exception {
String generateSequenceID(DbMapping map) throws Exception {
// Transactor tx = (Transactor) Thread.currentThread ();
// tx.timer.beginEvent ("generateID "+map);
Statement stmt = null;