Document per-implementation behaviors of native get* methods

Change-Id: I5d20d7796b85ce62750dd50dd79e47d76716b24c

Author: dtrebbien

core/java/android/database/CursorWindow.java

@@ -245,6 +245,15 @@ public byte[] getBlob(int row, int col) {
         }
     }
 
+    /**
+     * Returns the value at (<code>row</code>, <code>col</code>) as a <code>byte</code> array.
+     *
+     * <p>If the value is null, then <code>null</code> is returned. If the
+     * type of column <code>col</code> is a string type, then the result
+     * is the array of bytes that make up the internal representation of the
+     * string value. If the type of column <code>col</code> is integral or floating-point,
+     * then an {@link SQLiteException} is thrown.
+     */
     private native byte[] getBlob_native(int row, int col);
 
     /**
@@ -332,6 +341,19 @@ public String getString(int row, int col) {
         }
     }
 
+    /**
+     * Returns the value at (<code>row</code>, <code>col</code>) as a <code>String</code>.
+     *
+     * <p>If the value is null, then <code>null</code> is returned. If the
+     * type of column <code>col</code> is integral, then the result is the string
+     * that is obtained by formatting the integer value with the <code>printf</code>
+     * family of functions using format specifier <code>%lld</code>. If the
+     * type of column <code>col</code> is floating-point, then the result is the string
+     * that is obtained by formatting the floating-point value with the
+     * <code>printf</code> family of functions using format specifier <code>%g</code>.
+     * If the type of column <code>col</code> is a blob type, then an
+     * {@link SQLiteException} is thrown.
+     */
     private native String getString_native(int row, int col);
 
     /**
@@ -383,6 +405,17 @@ public long getLong(int row, int col) {
         }
     }
 
+    /**
+     * Returns the value at (<code>row</code>, <code>col</code>) as a <code>long</code>.
+     *
+     * <p>If the value is null, then <code>0L</code> is returned. If the
+     * type of column <code>col</code> is a string type, then the result
+     * is the <code>long</code> that is obtained by parsing the string value with
+     * <code>strtoll</code>. If the type of column <code>col</code> is
+     * floating-point, then the result is the floating-point value casted to a <code>long</code>.
+     * If the type of column <code>col</code> is a blob type, then an
+     * {@link SQLiteException} is thrown.
+     */
     private native long getLong_native(int row, int col);
 
     /**
@@ -402,6 +435,17 @@ public double getDouble(int row, int col) {
         }
     }
 
+    /**
+     * Returns the value at (<code>row</code>, <code>col</code>) as a <code>double</code>.
+     *
+     * <p>If the value is null, then <code>0.0</code> is returned. If the
+     * type of column <code>col</code> is a string type, then the result
+     * is the <code>double</code> that is obtained by parsing the string value with
+     * <code>strtod</code>. If the type of column <code>col</code> is
+     * integral, then the result is the integer value casted to a <code>double</code>.
+     * If the type of column <code>col</code> is a blob type, then an
+     * {@link SQLiteException} is thrown.
+     */
     private native double getDouble_native(int row, int col);
 
     /**