Add original java source

Author: developernotes

src/net/sqlcipher/AbstractCursor.java

@@ -0,0 +1,254 @@
+/*
+ * Copyright (C) 2006 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 net.sqlcipher;
+
+import android.database.CharArrayBuffer;
+
+/**
+ * A base class for Cursors that store their data in {@link CursorWindow}s.
+ */
+public abstract class AbstractWindowedCursor extends AbstractCursor
+{
+    @Override
+    public byte[] getBlob(int columnIndex)
+    {
+        checkPosition();
+
+        synchronized(mUpdatedRows) {
+            if (isFieldUpdated(columnIndex)) {
+                return (byte[])getUpdatedField(columnIndex);
+            }
+        }
+
+        return mWindow.getBlob(mPos, columnIndex);
+    }
+
+    @Override
+    public String getString(int columnIndex)
+    {
+        checkPosition();
+
+        synchronized(mUpdatedRows) {
+            if (isFieldUpdated(columnIndex)) {
+                return (String)getUpdatedField(columnIndex);
+            }
+        }
+
+        return mWindow.getString(mPos, columnIndex);
+    }
+    
+    @Override
+    public void copyStringToBuffer(int columnIndex, CharArrayBuffer buffer)
+    {
+        checkPosition();
+        
+        synchronized(mUpdatedRows) {
+            if (isFieldUpdated(columnIndex)) {
+                super.copyStringToBuffer(columnIndex, buffer);
+            }
+        }
+        
+        mWindow.copyStringToBuffer(mPos, columnIndex, buffer);
+    }
+
+    @Override
+    public short getShort(int columnIndex)
+    {
+        checkPosition();
+
+        synchronized(mUpdatedRows) {
+            if (isFieldUpdated(columnIndex)) {
+                Number value = (Number)getUpdatedField(columnIndex);
+                return value.shortValue();
+            }
+        }
+
+        return mWindow.getShort(mPos, columnIndex);
+    }
+
+    @Override
+    public int getInt(int columnIndex)
+    {
+        checkPosition();
+
+        synchronized(mUpdatedRows) {
+            if (isFieldUpdated(columnIndex)) {
+                Number value = (Number)getUpdatedField(columnIndex);
+                return value.intValue();
+            }
+        }
+
+        return mWindow.getInt(mPos, columnIndex);
+    }
+
+    @Override
+    public long getLong(int columnIndex)
+    {
+        checkPosition();
+
+        synchronized(mUpdatedRows) {
+            if (isFieldUpdated(columnIndex)) {
+                Number value = (Number)getUpdatedField(columnIndex);
+                return value.longValue();
+            }
+        }
+
+        return mWindow.getLong(mPos, columnIndex);
+    }
+
+    @Override
+    public float getFloat(int columnIndex)
+    {
+        checkPosition();
+
+        synchronized(mUpdatedRows) {
+            if (isFieldUpdated(columnIndex)) {
+                Number value = (Number)getUpdatedField(columnIndex);
+                return value.floatValue();
+            }
+        }
+
+        return mWindow.getFloat(mPos, columnIndex);
+    }
+
+    @Override
+    public double getDouble(int columnIndex)
+    {
+        checkPosition();
+
+        synchronized(mUpdatedRows) {
+            if (isFieldUpdated(columnIndex)) {
+                Number value = (Number)getUpdatedField(columnIndex);
+                return value.doubleValue();
+            }
+        }
+
+        return mWindow.getDouble(mPos, columnIndex);
+    }
+
+    @Override
+    public boolean isNull(int columnIndex)
+    {
+        checkPosition();
+
+        synchronized(mUpdatedRows) {
+            if (isFieldUpdated(columnIndex)) {
+                return getUpdatedField(columnIndex) == null;
+            }
+        }
+
+        return mWindow.isNull(mPos, columnIndex);
+    }
+
+    public boolean isBlob(int columnIndex)
+    {
+        checkPosition();
+
+        synchronized(mUpdatedRows) {
+            if (isFieldUpdated(columnIndex)) {
+                Object object = getUpdatedField(columnIndex);
+                return object == null || object instanceof byte[];
+            }
+        }
+
+        return mWindow.isBlob(mPos, columnIndex);
+    }
+
+    public boolean isString(int columnIndex)
+    {
+        checkPosition();
+
+        synchronized(mUpdatedRows) {
+            if (isFieldUpdated(columnIndex)) {
+                Object object = getUpdatedField(columnIndex);
+                return object == null || object instanceof String;
+            }
+        }
+
+        return mWindow.isString(mPos, columnIndex);
+    }
+
+    public boolean isLong(int columnIndex)
+    {
+        checkPosition();
+
+        synchronized(mUpdatedRows) {
+            if (isFieldUpdated(columnIndex)) {
+                Object object = getUpdatedField(columnIndex);
+                return object != null && (object instanceof Integer || object instanceof Long);
+            }
+        }
+
+        return mWindow.isLong(mPos, columnIndex);
+    }
+
+    public boolean isFloat(int columnIndex)
+    {
+        checkPosition();
+
+        synchronized(mUpdatedRows) {
+            if (isFieldUpdated(columnIndex)) {
+                Object object = getUpdatedField(columnIndex);
+                return object != null && (object instanceof Float || object instanceof Double);
+            }
+        }
+
+        return mWindow.isFloat(mPos, columnIndex);
+    }
+
+    @Override
+    public int getType(int columnIndex) {
+        checkPosition();
+        return mWindow.getType(mPos, columnIndex);
+    }
+
+    @Override
+    protected void checkPosition()
+    {
+        super.checkPosition();
+        
+        if (mWindow == null) {
+            throw new StaleDataException("Access closed cursor");
+        }
+    }
+
+    @Override
+    public CursorWindow getWindow() {
+        return mWindow;
+    }
+    
+    /**
+     * Set a new cursor window to cursor, usually set a remote cursor window
+     * @param window cursor window
+     */
+    public void setWindow(CursorWindow window) {
+        if (mWindow != null) {
+            mWindow.close();
+        }
+        mWindow = window;
+    }
+    
+    public boolean hasWindow() {
+        return mWindow != null;
+    }
+
+    /**
+     * This needs be updated in {@link #onMove} by subclasses, and
+     * needs to be set to NULL when the contents of the cursor change.
+     */
+    protected CursorWindow mWindow;
+}