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/*
* ConcurrencyOptVerify.java
*
* Created on March 3, 2000
*
*/
package com.sun.jdo.spi.persistence.support.sqlstore.sql.concurrency;
import com.sun.jdo.spi.persistence.support.sqlstore.model.FieldDesc;
import com.sun.jdo.spi.persistence.support.sqlstore.model.LocalFieldDesc;
import com.sun.jdo.spi.persistence.support.sqlstore.sql.generator.QueryPlan;
import com.sun.jdo.spi.persistence.support.sqlstore.sql.generator.UpdateQueryPlan;
import java.util.ArrayList;
import java.util.BitSet;
/**
*/
public class ConcurrencyOptVerify extends ConcurrencyCheckDirty {
/**
* Find all the local fields that have been updated
* and use their concurrencyGroup to set the verifyGroupMask.
*/
protected BitSet prepareVerifyGroupMask(UpdateQueryPlan plan) {
ArrayList fields;
BitSet verifyGroupMask = new BitSet();
int action = plan.getAction();
for (int i = 0; i <= 1; i++) {
if (i == 0) {
fields = plan.getConfig().fields;
} else {
fields = plan.getConfig().hiddenFields;
}
if (fields == null) {
continue;
}
for (int j = 0; j < fields.size(); j++) {
FieldDesc f = (FieldDesc) fields.get(j);
if ((f instanceof LocalFieldDesc) &&
(f.sqlProperties & FieldDesc.PROP_IN_CONCURRENCY_CHECK) > 0) {
// In the case of a deleted instance with no modified fields
// we use the present fields in the before image to perform
// the concurrency check.
if (afterImage.getSetMaskBit(f.absoluteID) ||
((action == QueryPlan.ACT_DELETE) &&
beforeImage.getPresenceMaskBit(f.absoluteID))) {
if (f.concurrencyGroup != -1) {
verifyGroupMask.set(f.concurrencyGroup);
}
}
}
}
}
return verifyGroupMask;
}
protected boolean isFieldVerificationRequired(LocalFieldDesc lf,
BitSet verifyGroupMask) {
boolean fieldVerificationRequired = true;
if (lf.concurrencyGroup == -1) {
if (!afterImage.getSetMaskBit(lf.absoluteID)) {
fieldVerificationRequired = false;
}
} else {
if (!verifyGroupMask.get(lf.concurrencyGroup)) {
fieldVerificationRequired = false;
}
}
return fieldVerificationRequired;
}
public Object clone() {
return new ConcurrencyOptVerify();
}
}