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13514
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1 /*
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2 * Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved. This
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3 * code is released under a tri EPL/GPL/LGPL license. You can use it,
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4 * redistribute it and/or modify it under the terms of the:
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5 *
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6 * Eclipse Public License version 1.0
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7 * GNU General Public License version 2
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8 * GNU Lesser General Public License version 2.1
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9 */
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10 package com.oracle.truffle.ruby.runtime.lookup;
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11
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12 import java.util.*;
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13
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14 import com.oracle.truffle.api.*;
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15 import com.oracle.truffle.api.utilities.*;
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16 import com.oracle.truffle.ruby.runtime.methods.*;
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17
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18 /**
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19 * A fork in the lookup graph. Look at first and then look at second.
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20 */
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21 public class LookupFork implements LookupNode {
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22
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23 private LookupNode first;
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24 private LookupNode second;
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25
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26 public LookupFork(LookupNode first, LookupNode second) {
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27 this.first = first;
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28 this.second = second;
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29 }
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30
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31 public boolean setClassVariableIfAlreadySet(String variableName, Object value) {
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32 if (first.setClassVariableIfAlreadySet(variableName, value)) {
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33 return true;
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34 }
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35
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36 return second.setClassVariableIfAlreadySet(variableName, value);
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37 }
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38
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39 @Override
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40 public Object lookupConstant(String constantName) {
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41 final Object firstResult = first.lookupConstant(constantName);
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42
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43 if (firstResult != null) {
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44 return firstResult;
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45 }
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46
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47 return second.lookupConstant(constantName);
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48 }
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49
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50 @Override
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51 public Object lookupClassVariable(String classVariable) {
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52 final Object firstResult = first.lookupClassVariable(classVariable);
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53
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54 if (firstResult != null) {
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55 return firstResult;
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56 }
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57
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58 return second.lookupClassVariable(classVariable);
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59 }
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60
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61 @Override
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62 public RubyMethod lookupMethod(String methodName) {
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63 final RubyMethod firstResult = first.lookupMethod(methodName);
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64
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65 if (firstResult != null) {
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66 return firstResult;
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67 }
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68
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69 return second.lookupMethod(methodName);
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70 }
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71
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72 @Override
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73 public Assumption getUnmodifiedAssumption() {
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74 return new UnionAssumption(first.getUnmodifiedAssumption(), second.getUnmodifiedAssumption());
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75 }
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76
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77 public LookupNode getFirst() {
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78 return first;
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79 }
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80
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81 public LookupNode getSecond() {
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82 return second;
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83 }
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84
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85 public Set<String> getClassVariables() {
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86 final Set<String> classVariables = new HashSet<>();
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87 classVariables.addAll(first.getClassVariables());
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88 classVariables.addAll(second.getClassVariables());
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89 return classVariables;
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90 }
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91
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92 public void getMethods(Map<String, RubyMethod> methods) {
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93 second.getMethods(methods);
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94 first.getMethods(methods);
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95 }
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96
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97 }
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