| /* |
| * Copyright (C) 2007 The Android Open Source Project |
| * |
| * 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 android.database.sqlite; |
| |
| /** |
| * An object create from a SQLiteDatabase that can be closed. |
| */ |
| public abstract class SQLiteClosable { |
| private int mReferenceCount = 1; |
| private Object mLock = new Object(); |
| protected abstract void onAllReferencesReleased(); |
| protected void onAllReferencesReleasedFromContainer(){} |
| |
| public void acquireReference() { |
| synchronized(mLock) { |
| if (mReferenceCount <= 0) { |
| throw new IllegalStateException( |
| "attempt to acquire a reference on a close SQLiteClosable"); |
| } |
| mReferenceCount++; |
| } |
| } |
| |
| public void releaseReference() { |
| synchronized(mLock) { |
| mReferenceCount--; |
| if (mReferenceCount == 0) { |
| onAllReferencesReleased(); |
| } |
| } |
| } |
| |
| public void releaseReferenceFromContainer() { |
| synchronized(mLock) { |
| mReferenceCount--; |
| if (mReferenceCount == 0) { |
| onAllReferencesReleasedFromContainer(); |
| } |
| } |
| } |
| } |