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// Copyright 2008 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.gwtorm.client.impl;
import com.google.gwtorm.client.Key;
import com.google.gwtorm.client.OrmException;
import com.google.gwtorm.client.Transaction;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Set;
public abstract class AbstractTransaction implements Transaction {
private static LinkedHashMap<Object, Action<?, Key<?>, AbstractTransaction>> newMap() {
return new LinkedHashMap<Object, Action<?, Key<?>, AbstractTransaction>>();
}
protected final Map<Object, Action<?, Key<?>, AbstractTransaction>> pendingInsert;
protected final Map<Object, Action<?, Key<?>, AbstractTransaction>> pendingUpdate;
protected final Map<Object, Action<?, Key<?>, AbstractTransaction>> pendingUpsert;
protected final Map<Object, Action<?, Key<?>, AbstractTransaction>> pendingDelete;
protected AbstractTransaction() {
pendingInsert = newMap();
pendingUpdate = newMap();
pendingUpsert = newMap();
pendingDelete = newMap();
}
public void commit() throws OrmException {
for (Action<?, Key<?>, AbstractTransaction> a : pendingDelete.values()) {
a.doDelete(this);
}
for (Action<?, Key<?>, AbstractTransaction> a : pendingInsert.values()) {
a.doInsert(this);
}
for (Action<?, Key<?>, AbstractTransaction> a : pendingUpdate.values()) {
a.doUpdate(this);
}
for (Action<?, Key<?>, AbstractTransaction> a : pendingUpsert.values()) {
a.doUpsert(this);
}
}
<E, K extends Key<?>, T extends AbstractTransaction> void queueInsert(
final AbstractAccess<E, ?, T> access, final Iterable<E> list) {
queue(pendingInsert, access, list);
}
<E, K extends Key<?>, T extends AbstractTransaction> void queueUpdate(
final AbstractAccess<E, ?, T> access, final Iterable<E> list) {
queue(pendingUpdate, access, list);
}
<E, K extends Key<?>, T extends AbstractTransaction> void queueUpsert(
final AbstractAccess<E, ?, T> access, final Iterable<E> list) {
queue(pendingUpsert, access, list);
}
<E, K extends Key<?>, T extends AbstractTransaction> void queueDelete(
final AbstractAccess<E, ?, T> access, final Iterable<E> list) {
queue(pendingDelete, access, list);
}
private static <E, K extends Key<?>, T extends AbstractTransaction> void queue(
final Map<Object, Action<?, Key<?>, AbstractTransaction>> queue,
final AbstractAccess<E, K, T> access, final Iterable<E> list) {
Action<E, K, T> c = get(queue, access);
if (c == null) {
c = new Action<E, K, T>(access);
put(queue, c);
}
c.addAll(list);
}
@SuppressWarnings("unchecked")
private static <E, K extends Key<?>, T extends AbstractTransaction> Action<E, K, T> get(
final Map<Object, Action<?, Key<?>, AbstractTransaction>> q,
final AbstractAccess<E, K, T> access) {
return (Action<E, K, T>) q.get(access);
}
@SuppressWarnings("unchecked")
private static <E, K extends Key<?>, T extends AbstractTransaction> void put(
final Map queue, Action<E, K, T> c) {
// This silly little method was needed to defeat the Java compiler's
// generic type checking. Somehow we got lost in the anonymous types
// from all the ? in our Map definition and the compiler just won't let
// us do a put into the map.
//
queue.put(c.access, c);
}
private static class Action<E, K extends Key<?>, T extends AbstractTransaction> {
private final AbstractAccess<E, K, T> access;
private final Set<E> instances;
Action(final AbstractAccess<E, K, T> a) {
access = a;
instances = new LinkedHashSet<E>();
}
void addAll(final Iterable<E> list) {
for (final E o : list) {
instances.add(o);
}
}
void doInsert(final T t) throws OrmException {
access.doInsert(instances, t);
}
void doUpdate(final T t) throws OrmException {
access.doUpdate(instances, t);
}
void doUpsert(final T t) throws OrmException {
access.doUpsert(instances, t);
}
void doDelete(final T t) throws OrmException {
access.doDelete(instances, t);
}
}
}
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