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 package org.graalvm.compiler.graph.iterators;
  24 
  25 import java.util.Iterator;
  26 
  27 import org.graalvm.compiler.graph.Node;
  28 
  29 public class FilteredNodeIterable<T extends Node> implements NodeIterable<T> {
  30 
  31     protected final NodeIterable<T> nodeIterable;
  32     protected NodePredicate predicate = NodePredicates.alwaysTrue();
  33 
  34     public FilteredNodeIterable(NodeIterable<T> nodeIterable) {
  35         this.nodeIterable = nodeIterable;
  36     }
  37 
  38     public FilteredNodeIterable<T> and(NodePredicate nodePredicate) {
  39         this.predicate = this.predicate.and(nodePredicate);
  40         return this;
  41     }
  42 
  43     @Override
  44     public Iterator<T> iterator() {
  45         return new PredicatedProxyNodeIterator<>(nodeIterable.iterator(), predicate);
  46     }
  47 
  48     @SuppressWarnings("unchecked")
  49     @Override
  50     public <F extends T> FilteredNodeIterable<F> filter(Class<F> clazz) {
  51         return (FilteredNodeIterable<F>) this.and(NodePredicates.isA(clazz));
  52     }
  53 
  54     @Override
  55     public FilteredNodeIterable<T> filter(NodePredicate p) {
  56         return this.and(p);
  57     }
  58 
  59 }