1 /* 2 * Copyright (c) 2011, 2017, 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.graphio; 24 25 import java.util.Collection; 26 import java.util.Collections; 27 28 final class DefaultGraphBlocks implements GraphBlocks<Object, Object, Object> { 29 private static final DefaultGraphBlocks DEFAULT = new DefaultGraphBlocks(); 30 31 private DefaultGraphBlocks() { 32 } 33 34 @SuppressWarnings("unchecked") 35 public static <G, B, N> GraphBlocks<G, B, N> empty() { 36 return (GraphBlocks<G, B, N>) DEFAULT; 37 } 38 39 @Override 40 public Collection<? extends Void> blocks(Object graph) { 41 return Collections.emptyList(); 42 } 43 44 @Override 45 public int blockId(Object block) { 46 return -1; 47 } 48 49 @Override 50 public Collection<? extends Object> blockNodes(Object info, Object block) { 51 return Collections.emptyList(); 52 } 53 54 @Override 55 public Collection<? extends Object> blockSuccessors(Object block) { 56 return Collections.emptyList(); 57 } 58 }