10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package jdk.nashorn.internal.runtime.arrays;
  27 
  28 import java.lang.invoke.MethodHandle;
  29 import java.nio.ByteBuffer;
  30 import jdk.nashorn.internal.runtime.GlobalObject;
  31 import jdk.nashorn.internal.runtime.JSType;
  32 import jdk.nashorn.internal.runtime.PropertyDescriptor;
  33 
  34 /**
  35  * ArrayData - abstraction for wrapping array elements
  36  */
  37 public abstract class ArrayData {
  38 
  39     /** Minimum chunk size for underlying arrays */
  40     protected static final int CHUNK_SIZE = 16;
  41 
  42     /** Mask for getting a chunk */
  43     protected static final int CHUNK_MASK = CHUNK_SIZE - 1;
  44 
  45     /**
  46      * Immutable empty array to get ScriptObjects started.
  47      */
  48     public static final ArrayData EMPTY_ARRAY = new NoTypeArrayData();
  49 
  50     /**

 382      * Returns if element at specific index range can be deleted or not.
 383      *
 384      * @param fromIndex  the start index
 385      * @param toIndex    the end index
 386      * @param strict     are we in strict mode
 387      *
 388      * @return true if range can be deleted
 389      */
 390     public boolean canDelete(final long fromIndex, final long toIndex, final boolean strict) {
 391         return true;
 392     }
 393 
 394     /**
 395      * Returns property descriptor for element at a given index
 396      *
 397      * @param global the global object
 398      * @param index  the index
 399      *
 400      * @return property descriptor for element
 401      */
 402     public PropertyDescriptor getDescriptor(final GlobalObject global, final int index) {
 403         return global.newDataDescriptor(getObject(index), true, true, true);
 404     }
 405 
 406     /**
 407      * Delete an array value at the given index, substituting
 408      * for an undefined
 409      *
 410      * @param index the index
 411      * @return new array data (or same)
 412      */
 413     public abstract ArrayData delete(int index);
 414 
 415     /**
 416      * Delete a given range from this array;
 417      *
 418      * @param fromIndex  from index (inclusive)
 419      * @param toIndex    to index (inclusive)
 420      *
 421      * @return new ArrayData after deletion
 422      */

  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package jdk.nashorn.internal.runtime.arrays;
  27 
  28 import java.lang.invoke.MethodHandle;
  29 import java.nio.ByteBuffer;
  30 import jdk.nashorn.internal.objects.Global;
  31 import jdk.nashorn.internal.runtime.JSType;
  32 import jdk.nashorn.internal.runtime.PropertyDescriptor;
  33 
  34 /**
  35  * ArrayData - abstraction for wrapping array elements
  36  */
  37 public abstract class ArrayData {
  38 
  39     /** Minimum chunk size for underlying arrays */
  40     protected static final int CHUNK_SIZE = 16;
  41 
  42     /** Mask for getting a chunk */
  43     protected static final int CHUNK_MASK = CHUNK_SIZE - 1;
  44 
  45     /**
  46      * Immutable empty array to get ScriptObjects started.
  47      */
  48     public static final ArrayData EMPTY_ARRAY = new NoTypeArrayData();
  49 
  50     /**

 382      * Returns if element at specific index range can be deleted or not.
 383      *
 384      * @param fromIndex  the start index
 385      * @param toIndex    the end index
 386      * @param strict     are we in strict mode
 387      *
 388      * @return true if range can be deleted
 389      */
 390     public boolean canDelete(final long fromIndex, final long toIndex, final boolean strict) {
 391         return true;
 392     }
 393 
 394     /**
 395      * Returns property descriptor for element at a given index
 396      *
 397      * @param global the global object
 398      * @param index  the index
 399      *
 400      * @return property descriptor for element
 401      */
 402     public PropertyDescriptor getDescriptor(final Global global, final int index) {
 403         return global.newDataDescriptor(getObject(index), true, true, true);
 404     }
 405 
 406     /**
 407      * Delete an array value at the given index, substituting
 408      * for an undefined
 409      *
 410      * @param index the index
 411      * @return new array data (or same)
 412      */
 413     public abstract ArrayData delete(int index);
 414 
 415     /**
 416      * Delete a given range from this array;
 417      *
 418      * @param fromIndex  from index (inclusive)
 419      * @param toIndex    to index (inclusive)
 420      *
 421      * @return new ArrayData after deletion
 422      */