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Transaction.java
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Transaction.java
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/**
* Copyright (C) 2016 Czech Technical University in Prague
* <p>
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any
* later version.
* <p>
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details. You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package cz.cvut.kbss.ontodriver.sesame;
import static cz.cvut.kbss.ontodriver.sesame.TransactionState.ABORTED;
import static cz.cvut.kbss.ontodriver.sesame.TransactionState.ACTIVE;
import static cz.cvut.kbss.ontodriver.sesame.TransactionState.COMMITTED;
import static cz.cvut.kbss.ontodriver.sesame.TransactionState.FAILED;
import static cz.cvut.kbss.ontodriver.sesame.TransactionState.PARTIALLY_COMMITTED;
public final class Transaction {
private TransactionState state;
public void begin() {
if (state != null && state != ABORTED && state != COMMITTED) {
throw new IllegalStateException("Cannot begin transaction. Current state is " + state);
}
this.state = ACTIVE;
}
public void commit() {
if (state != ACTIVE) {
throw new IllegalStateException("Cannot commit transaction. Current state is " + state);
}
this.state = PARTIALLY_COMMITTED;
}
public void afterCommit() {
if (state != PARTIALLY_COMMITTED) {
throw new IllegalStateException("Cannot finish commit. Current state is " + state);
}
this.state = COMMITTED;
}
public void rollback() {
if (state != ACTIVE && state != PARTIALLY_COMMITTED && state != FAILED) {
throw new IllegalStateException("Cannot rollback transaction. Current state is "
+ state);
}
this.state = FAILED;
}
public void afterRollback() {
if (state != FAILED) {
throw new IllegalStateException("Cannot finish rollback. Current state is " + state);
}
this.state = ABORTED;
}
public boolean isActive() {
return state == ACTIVE;
}
public TransactionState getState() {
return state;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((state == null) ? 0 : state.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Transaction other = (Transaction) obj;
if (state != other.state)
return false;
return true;
}
@Override
public String toString() {
return state != null ? state.toString() : "null";
}
}