1 /*
   2  * Copyright (c) 2011, 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 
  25 package org.graalvm.compiler.graph.iterators;
  26 
  27 import java.util.Iterator;
  28 
  29 import org.graalvm.compiler.graph.Node;
  30 
  31 public class FilteredNodeIterable<T extends Node> implements NodeIterable<T> {
  32 
  33     protected final NodeIterable<T> nodeIterable;
  34     protected NodePredicate predicate = NodePredicates.alwaysTrue();
  35 
  36     public FilteredNodeIterable(NodeIterable<T> nodeIterable) {
  37         this.nodeIterable = nodeIterable;
  38     }
  39 
  40     public FilteredNodeIterable<T> and(NodePredicate nodePredicate) {
  41         this.predicate = this.predicate.and(nodePredicate);
  42         return this;
  43     }
  44 
  45     @Override
  46     public Iterator<T> iterator() {
  47         return new PredicatedProxyNodeIterator<>(nodeIterable.iterator(), predicate);
  48     }
  49 
  50     @SuppressWarnings("unchecked")
  51     @Override
  52     public <F extends T> FilteredNodeIterable<F> filter(Class<F> clazz) {
  53         return (FilteredNodeIterable<F>) this.and(NodePredicates.isA(clazz));
  54     }
  55 
  56     @Override
  57     public FilteredNodeIterable<T> filter(NodePredicate p) {
  58         return this.and(p);
  59     }
  60 
  61 }