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Java JDBC 4.2 (JRE 8+) driver for YugaByte SQL database
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/*
* Copyright (c) 2009, PostgreSQL Global Development Group
* See the LICENSE file in the project root for more information.
*/
package org.postgresql.xa;
import org.checkerframework.checker.nullness.qual.Nullable;
import java.util.Arrays;
import java.util.Base64;
import java.util.logging.Level;
import java.util.logging.LogRecord;
import java.util.logging.Logger;
import javax.transaction.xa.Xid;
class RecoveredXid implements Xid {
int formatId;
byte[] globalTransactionId;
byte[] branchQualifier;
RecoveredXid(int formatId, byte[] globalTransactionId, byte[] branchQualifier) {
this.formatId = formatId;
this.globalTransactionId = globalTransactionId;
this.branchQualifier = branchQualifier;
}
@Override
public int getFormatId() {
return formatId;
}
@Override
public byte[] getGlobalTransactionId() {
return globalTransactionId;
}
@Override
public byte[] getBranchQualifier() {
return branchQualifier;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + Arrays.hashCode(branchQualifier);
result = prime * result + formatId;
result = prime * result + Arrays.hashCode(globalTransactionId);
return result;
}
@Override
public boolean equals(@Nullable Object o) {
if (o == this) {
// optimization for the common case.
return true;
}
if (!(o instanceof Xid)) {
return false;
}
Xid other = (Xid) o;
return formatId == other.getFormatId()
&& Arrays.equals(globalTransactionId, other.getGlobalTransactionId())
&& Arrays.equals(branchQualifier, other.getBranchQualifier());
}
/**
* This is for debugging purposes only.
*/
@Override
public String toString() {
return xidToString(this);
}
// --- Routines for converting xid to string and back.
static String xidToString(Xid xid) {
final byte[] globalTransactionId = xid.getGlobalTransactionId();
final byte[] branchQualifier = xid.getBranchQualifier();
final StringBuilder sb = new StringBuilder((int) (16 + globalTransactionId.length * 1.5 + branchQualifier.length * 1.5));
sb.append(xid.getFormatId())
.append('_')
.append(Base64.getEncoder().encodeToString(globalTransactionId))
.append('_')
.append(Base64.getEncoder().encodeToString(branchQualifier));
return sb.toString();
}
/**
* @return recovered xid, or null if s does not represent a valid xid encoded by the driver.
*/
static @Nullable Xid stringToXid(String s) {
final int a = s.indexOf('_');
final int b = s.lastIndexOf('_');
if (a == b) {
// this also catches the case a == b == -1.
return null;
}
try {
int formatId = Integer.parseInt(s.substring(0, a));
//mime decoder is more forgiving to extraneous characters by ignoring them
byte[] globalTransactionId = Base64.getMimeDecoder().decode(s.substring(a + 1, b));
byte[] branchQualifier = Base64.getMimeDecoder().decode(s.substring(b + 1));
return new RecoveredXid(formatId, globalTransactionId, branchQualifier);
} catch (Exception ex) {
final LogRecord logRecord = new LogRecord(Level.FINE, "XID String is invalid: [{0}]");
logRecord.setParameters(new Object[]{s});
logRecord.setThrown(ex);
Logger.getLogger(RecoveredXid.class.getName()).log(logRecord);
// Doesn't seem to be an xid generated by this driver.
return null;
}
}
}
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