src/jdk/nashorn/internal/runtime/arrays/ArrayLikeIterator.java

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   9  * by Oracle in the LICENSE file that accompanied this code.
  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.util.Iterator;

  29 import jdk.nashorn.internal.runtime.JSType;
  30 import jdk.nashorn.internal.runtime.ScriptObject;
  31 
  32 /**
  33  * Superclass for array iterators
  34  * TODO: rewrite these
  35  *
  36  * @param <T> element type
  37  */
  38 abstract public class ArrayLikeIterator<T> implements Iterator<T> {
  39 
  40     /** current element index in iteration */
  41     protected long index;
  42 
  43     /** should undefined elements be included in the iteration? */
  44     protected final boolean includeUndefined;
  45 
  46     /**
  47      * Constructor
  48      *


 108     }
 109 
 110     /**
 111      * ArrayLikeIterator factory
 112      * @param object object over which to do reverse element iteration
 113      * @param includeUndefined should undefined elements be included in the iteration
 114      * @return iterator
 115      */
 116     public static ArrayLikeIterator<Object> arrayLikeIterator(final Object object, final boolean includeUndefined) {
 117         Object obj = object;
 118 
 119         if (ScriptObject.isArray(obj)) {
 120             return new ArrayIterator((ScriptObject) obj, includeUndefined);
 121         }
 122 
 123         obj = JSType.toScriptObject(obj);
 124         if (obj instanceof ScriptObject) {
 125             return new MapIterator((ScriptObject)obj, includeUndefined);
 126         }
 127 




 128         return new EmptyArrayLikeIterator();
 129     }
 130 
 131     /**
 132      * ArrayLikeIterator factory (reverse order)
 133      * @param object object over which to do reverse element iteration
 134      * @param includeUndefined should undefined elements be included in the iteration
 135      * @return iterator
 136      */
 137     public static ArrayLikeIterator<Object> reverseArrayLikeIterator(final Object object, final boolean includeUndefined) {
 138         Object obj = object;
 139 
 140         if (ScriptObject.isArray(obj)) {
 141             return new ReverseArrayIterator((ScriptObject) obj, includeUndefined);
 142         }
 143 
 144         obj = JSType.toScriptObject(obj);
 145         if (obj instanceof ScriptObject) {
 146             return new ReverseMapIterator((ScriptObject)obj, includeUndefined);




 147         }
 148 
 149         assert !obj.getClass().isArray();
 150 
 151         return new EmptyArrayLikeIterator();
 152     }
 153 
 154 }


   9  * by Oracle in the LICENSE file that accompanied this code.
  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.util.Iterator;
  29 import jdk.nashorn.api.scripting.ScriptObjectMirror;
  30 import jdk.nashorn.internal.runtime.JSType;
  31 import jdk.nashorn.internal.runtime.ScriptObject;
  32 
  33 /**
  34  * Superclass for array iterators
  35  * TODO: rewrite these
  36  *
  37  * @param <T> element type
  38  */
  39 abstract public class ArrayLikeIterator<T> implements Iterator<T> {
  40 
  41     /** current element index in iteration */
  42     protected long index;
  43 
  44     /** should undefined elements be included in the iteration? */
  45     protected final boolean includeUndefined;
  46 
  47     /**
  48      * Constructor
  49      *


 109     }
 110 
 111     /**
 112      * ArrayLikeIterator factory
 113      * @param object object over which to do reverse element iteration
 114      * @param includeUndefined should undefined elements be included in the iteration
 115      * @return iterator
 116      */
 117     public static ArrayLikeIterator<Object> arrayLikeIterator(final Object object, final boolean includeUndefined) {
 118         Object obj = object;
 119 
 120         if (ScriptObject.isArray(obj)) {
 121             return new ArrayIterator((ScriptObject) obj, includeUndefined);
 122         }
 123 
 124         obj = JSType.toScriptObject(obj);
 125         if (obj instanceof ScriptObject) {
 126             return new MapIterator((ScriptObject)obj, includeUndefined);
 127         }
 128 
 129         if (obj instanceof ScriptObjectMirror) {
 130             return new ScriptObjectMirrorIterator((ScriptObjectMirror)obj, includeUndefined);
 131         }
 132 
 133         return new EmptyArrayLikeIterator();
 134     }
 135 
 136     /**
 137      * ArrayLikeIterator factory (reverse order)
 138      * @param object object over which to do reverse element iteration
 139      * @param includeUndefined should undefined elements be included in the iteration
 140      * @return iterator
 141      */
 142     public static ArrayLikeIterator<Object> reverseArrayLikeIterator(final Object object, final boolean includeUndefined) {
 143         Object obj = object;
 144 
 145         if (ScriptObject.isArray(obj)) {
 146             return new ReverseArrayIterator((ScriptObject) obj, includeUndefined);
 147         }
 148 
 149         obj = JSType.toScriptObject(obj);
 150         if (obj instanceof ScriptObject) {
 151             return new ReverseMapIterator((ScriptObject)obj, includeUndefined);
 152         }
 153 
 154         if (obj instanceof ScriptObjectMirror) {
 155             return new ReverseScriptObjectMirrorIterator((ScriptObjectMirror)obj, includeUndefined);
 156         }
 157 
 158         assert !obj.getClass().isArray();
 159 
 160         return new EmptyArrayLikeIterator();
 161     }
 162 
 163 }