| /* |
| * 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; |
| |
| import android.database.CursorWindow; |
| |
| /** |
| * An object created from a SQLiteDatabase that can be closed. |
| */ |
| public abstract class SQLiteClosable { |
| private int mReferenceCount = 1; |
| |
| protected abstract void onAllReferencesReleased(); |
| protected void onAllReferencesReleasedFromContainer() {} |
| |
| public void acquireReference() { |
| synchronized(this) { |
| if (mReferenceCount <= 0) { |
| throw new IllegalStateException( |
| "attempt to re-open an already-closed object: " + getObjInfo()); |
| } |
| mReferenceCount++; |
| } |
| } |
| |
| public void releaseReference() { |
| boolean refCountIsZero = false; |
| synchronized(this) { |
| refCountIsZero = --mReferenceCount == 0; |
| } |
| if (refCountIsZero) { |
| onAllReferencesReleased(); |
| } |
| } |
| |
| public void releaseReferenceFromContainer() { |
| boolean refCountIsZero = false; |
| synchronized(this) { |
| refCountIsZero = --mReferenceCount == 0; |
| } |
| if (refCountIsZero) { |
| onAllReferencesReleasedFromContainer(); |
| } |
| } |
| |
| private String getObjInfo() { |
| StringBuilder buff = new StringBuilder(); |
| buff.append(this.getClass().getName()); |
| buff.append(" ("); |
| if (this instanceof SQLiteDatabase) { |
| buff.append("database = "); |
| buff.append(((SQLiteDatabase)this).getPath()); |
| } else if (this instanceof SQLiteProgram) { |
| buff.append("mSql = "); |
| buff.append(((SQLiteProgram)this).mSql); |
| } else if (this instanceof CursorWindow) { |
| buff.append("mStartPos = "); |
| buff.append(((CursorWindow)this).getStartPosition()); |
| } |
| buff.append(") "); |
| return buff.toString(); |
| } |
| } |