Java 类org.eclipse.xtext.xbase.XTryCatchFinallyExpression 实例源码

@Check
public void checkCatchClausesOrder(XTryCatchFinallyExpression expression) {
    ITypeReferenceOwner owner = new StandardTypeReferenceOwner(getServices(), expression);
    List<LightweightTypeReference> previousTypeReferences = new ArrayList<LightweightTypeReference>();
    for (XCatchClause catchClause : expression.getCatchClauses()) {
        LightweightTypeReference actualTypeReference = owner.toLightweightTypeReference(catchClause.getDeclaredParam().getParameterType());
        if (actualTypeReference == null) {
            continue;
        }
        if (isHandled(actualTypeReference, previousTypeReferences)) {
            error("Unreachable code: The catch block can never match. It is already handled by a previous condition.", catchClause.getDeclaredParam().getParameterType(), null, IssueCodes.UNREACHABLE_CATCH_BLOCK);
            continue;
        }
        previousTypeReferences.add(actualTypeReference);
    }
}

@Override
public Boolean caseXTryCatchFinallyExpression(XTryCatchFinallyExpression object) {
    List<XCatchClause> clauses = object.getCatchClauses();
    if (clauses.isEmpty()) {
        return Boolean.TRUE;
    }
    final List<LightweightTypeReference> caughtExceptions = Lists.newArrayList();
    boolean wasThrowable = false;
    for(XCatchClause clause: clauses) {
        JvmTypeReference caught = clause.getDeclaredParam().getParameterType();
        if (caught != null) {
            LightweightTypeReference caughtException = delegate.toLightweightReference(caught).getRawTypeReference();
            if (caughtException.isType(Throwable.class)) {
                wasThrowable = true;
            }
            caughtExceptions.add(caughtException);
        }
        delegate.collectThrownExceptions(clause.getExpression());
    }
    delegate.collectThrownExceptions(object.getFinallyExpression());
    if (wasThrowable) {
        return Boolean.FALSE;
    }
    delegate.catchExceptions(caughtExceptions).collectThrownExceptions(object.getExpression());
    return Boolean.FALSE;
}

/**
 * Syntax: '('*
 */
@Override
protected void emit_XParenthesizedExpression_LeftParenthesisKeyword_0_a(EObject semanticObject,
        ISynNavigable transition, List<INode> nodes) {

    Keyword kw = grammarAccess.getXParenthesizedExpressionAccess().getLeftParenthesisKeyword_0();

    if (nodes == null) {
        if (semanticObject instanceof XIfExpression || semanticObject instanceof XTryCatchFinallyExpression) {
            EObject cnt = semanticObject.eContainer();
            if (cnt instanceof XExpression && !(cnt instanceof XBlockExpression)
                    && !(cnt instanceof XForLoopExpression))
                acceptUnassignedKeyword(kw, kw.getValue(), null);
        }
        if (semanticObject instanceof XConstructorCall) {
            XConstructorCall call = (XConstructorCall) semanticObject;
            if (!call.isExplicitConstructorCall() && call.getArguments().isEmpty()) {
                acceptUnassignedKeyword(kw, kw.getValue(), null);
            }
        }
    }
    acceptNodes(transition, nodes);
}

protected boolean bracesAreAddedByOuterStructure(XExpression expression) {
    EObject container = expression.eContainer();
    if (container instanceof XTryCatchFinallyExpression 
            || container instanceof XIfExpression
            || container instanceof XClosure
            || container instanceof XSynchronizedExpression) {
        return true;
    }
    if (container instanceof XBlockExpression) {
        XBlockExpression blockExpression = (XBlockExpression) container;
        EList<XExpression> expressions = blockExpression.getExpressions();
        if (expressions.size() == 1 && expressions.get(0) == expression) {
            return bracesAreAddedByOuterStructure(blockExpression);
        }
    }
    if (!(container instanceof XExpression)) {
        return true;
    }
    return false;
}

protected void _toJavaStatement(XTryCatchFinallyExpression expr, ITreeAppendable outerAppendable, boolean isReferenced) {
    ITreeAppendable b = outerAppendable.trace(expr, false);
    if (isReferenced && !isPrimitiveVoid(expr)) {
        declareSyntheticVariable(expr, b);
    }
    b.newLine().append("try {").increaseIndentation();
    final boolean canBeReferenced = isReferenced && !isPrimitiveVoid(expr.getExpression());
    internalToJavaStatement(expr.getExpression(), b, canBeReferenced);
    if (canBeReferenced) {
        b.newLine().append(getVarName(expr, b)).append(" = ");
        internalToConvertedExpression(expr.getExpression(), b, getLightweightType(expr));
        b.append(";");
    }
    b.decreaseIndentation().newLine().append("}");
    appendCatchAndFinally(expr, b, isReferenced);
}

protected Collection<IEarlyExitComputer.ExitPoint> _exitPoints(final XTryCatchFinallyExpression expression) {
  Collection<IEarlyExitComputer.ExitPoint> tryExitPoints = this.getExitPoints(expression.getExpression());
  boolean _isNotEmpty = this.isNotEmpty(tryExitPoints);
  if (_isNotEmpty) {
    Collection<IEarlyExitComputer.ExitPoint> result = Lists.<IEarlyExitComputer.ExitPoint>newArrayList(tryExitPoints);
    EList<XCatchClause> _catchClauses = expression.getCatchClauses();
    for (final XCatchClause catchClause : _catchClauses) {
      {
        Collection<IEarlyExitComputer.ExitPoint> catchExitPoints = this.getExitPoints(catchClause.getExpression());
        boolean _isNotEmpty_1 = this.isNotEmpty(catchExitPoints);
        if (_isNotEmpty_1) {
          result.addAll(catchExitPoints);
        } else {
          return this.getExitPoints(expression.getFinallyExpression());
        }
      }
    }
    return result;
  }
  return this.getExitPoints(expression.getFinallyExpression());
}

@Override
protected void internalToConvertedExpression(XExpression obj, ITreeAppendable appendable) {
    if (obj instanceof XBlockExpression) {
        _toJavaExpression((XBlockExpression) obj, appendable);
    } else if (obj instanceof XCastedExpression) {
        _toJavaExpression((XCastedExpression) obj, appendable);
    } else if (obj instanceof XClosure) {
        _toJavaExpression((XClosure) obj, appendable);
    } else if (obj instanceof XAnnotation) {
        _toJavaExpression((XAnnotation) obj, appendable);
    } else if (obj instanceof XConstructorCall) {
        _toJavaExpression((XConstructorCall) obj, appendable);
    } else if (obj instanceof XIfExpression) {
        _toJavaExpression((XIfExpression) obj, appendable);
    } else if (obj instanceof XInstanceOfExpression) {
        _toJavaExpression((XInstanceOfExpression) obj, appendable);
    } else if (obj instanceof XSwitchExpression) {
        _toJavaExpression((XSwitchExpression) obj, appendable);
    } else if (obj instanceof XTryCatchFinallyExpression) {
        _toJavaExpression((XTryCatchFinallyExpression) obj, appendable);
    } else if (obj instanceof XListLiteral) {
        _toJavaExpression((XListLiteral) obj, appendable);
    } else if (obj instanceof XSetLiteral) {
        _toJavaExpression((XSetLiteral) obj, appendable);
    } else if (obj instanceof XSynchronizedExpression) {
        _toJavaExpression((XSynchronizedExpression) obj, appendable);
    } else if (obj instanceof XReturnExpression) {
        _toJavaExpression((XReturnExpression) obj, appendable);
    } else if (obj instanceof XThrowExpression) {
        _toJavaExpression((XThrowExpression) obj, appendable);
    } else {
        super.internalToConvertedExpression(obj, appendable);
    }
}

protected void appendCatchAndFinally(XTryCatchFinallyExpression expr, ITreeAppendable b, boolean isReferenced) {
    final EList<XCatchClause> catchClauses = expr.getCatchClauses();
    if (!catchClauses.isEmpty()) {
        String variable = b.declareSyntheticVariable(Tuples.pair(expr, "_catchedThrowable"), "_t");
        b.append(" catch (final Throwable ").append(variable).append(") ");
        b.append("{").increaseIndentation();
        b.newLine();
        Iterator<XCatchClause> iterator = catchClauses.iterator();
        while (iterator.hasNext()) {
            XCatchClause catchClause = iterator.next();
            ITreeAppendable catchClauseAppendable = b.trace(catchClause);
            appendCatchClause(catchClause, isReferenced, variable, catchClauseAppendable);
            if (iterator.hasNext()) {
                b.append(" else ");
            }
        }
        b.append(" else {");
        b.increaseIndentation();
        final JvmType sneakyThrowType = findKnownTopLevelType(Exceptions.class, expr);
        if (sneakyThrowType == null) {
            b.append("COMPILE ERROR : '"+Exceptions.class.getCanonicalName()+"' could not be found on the classpath!");
        } else {
            b.newLine().append("throw ");
            b.append(sneakyThrowType);
            b.append(".sneakyThrow(");
            b.append(variable);
            b.append(");");
        }
        closeBlock(b);
        closeBlock(b);
    }
    final XExpression finallyExp = expr.getFinallyExpression();
    if (finallyExp != null) {
        b.append(" finally {").increaseIndentation();
        internalToJavaStatement(finallyExp, b, false);
        b.decreaseIndentation().newLine().append("}");
    }
}

protected void _findImplicitReturns(final XTryCatchFinallyExpression expression, final ImplicitReturnFinder.Acceptor acceptor) {
  this.findImplicitReturns(expression.getExpression(), acceptor);
  final Consumer<XCatchClause> _function = (XCatchClause it) -> {
    this.findImplicitReturns(it.getExpression(), acceptor);
  };
  expression.getCatchClauses().forEach(_function);
}

protected Collection<IEarlyExitComputer.ExitPoint> exitPoints(final XExpression expression) {
  if (expression instanceof XDoWhileExpression) {
    return _exitPoints((XDoWhileExpression)expression);
  } else if (expression instanceof XWhileExpression) {
    return _exitPoints((XWhileExpression)expression);
  } else if (expression instanceof XAbstractFeatureCall) {
    return _exitPoints((XAbstractFeatureCall)expression);
  } else if (expression instanceof XBasicForLoopExpression) {
    return _exitPoints((XBasicForLoopExpression)expression);
  } else if (expression instanceof XBlockExpression) {
    return _exitPoints((XBlockExpression)expression);
  } else if (expression instanceof XConstructorCall) {
    return _exitPoints((XConstructorCall)expression);
  } else if (expression instanceof XForLoopExpression) {
    return _exitPoints((XForLoopExpression)expression);
  } else if (expression instanceof XIfExpression) {
    return _exitPoints((XIfExpression)expression);
  } else if (expression instanceof XReturnExpression) {
    return _exitPoints((XReturnExpression)expression);
  } else if (expression instanceof XSwitchExpression) {
    return _exitPoints((XSwitchExpression)expression);
  } else if (expression instanceof XSynchronizedExpression) {
    return _exitPoints((XSynchronizedExpression)expression);
  } else if (expression instanceof XThrowExpression) {
    return _exitPoints((XThrowExpression)expression);
  } else if (expression instanceof XTryCatchFinallyExpression) {
    return _exitPoints((XTryCatchFinallyExpression)expression);
  } else if (expression instanceof XVariableDeclaration) {
    return _exitPoints((XVariableDeclaration)expression);
  } else if (expression != null) {
    return _exitPoints(expression);
  } else {
    throw new IllegalArgumentException("Unhandled parameter types: " +
      Arrays.<Object>asList(expression).toString());
  }
}

protected void doTestTryCatchExpression(XTryCatchFinallyExpression tryEx) {
    assertFeatureCall("foo", ((XThrowExpression)tryEx.getExpression()).getExpression());
    assertFeatureCall("baz", tryEx.getFinallyExpression());

    assertEquals(1,tryEx.getCatchClauses().size());
    XCatchClause clause = tryEx.getCatchClauses().get(0);
    assertFeatureCall("bar", clause.getExpression());
    assertEquals("java.lang.Exception", clause.getDeclaredParam().getParameterType().getIdentifier());
    assertEquals("e", clause.getDeclaredParam().getName());
}

protected void doTestTryCatchExpression_2(XTryCatchFinallyExpression tryEx) {
    assertFeatureCall("foo", tryEx.getExpression());
    assertNull(tryEx.getFinallyExpression());

    assertEquals(1,tryEx.getCatchClauses().size());
    XCatchClause clause = tryEx.getCatchClauses().get(0);
    assertFeatureCall("bar", clause.getExpression());
    assertEquals("java.lang.Exception", clause.getDeclaredParam().getParameterType().getIdentifier());
    assertEquals("e", clause.getDeclaredParam().getName());
}

/**
 * see bug https://bugs.eclipse.org/bugs/show_bug.cgi?id=356722
 */
@Test public void testTryCatchExpression_3() throws Exception {
    XTryCatchFinallyExpression tryEx = (XTryCatchFinallyExpression) expression(
            "try foo catch (java.lang.Exception) {}");
    Iterator<INode> iterator = ((XtextResource)tryEx.eResource()).getParseResult().getSyntaxErrors().iterator();
    final INode errorNode = iterator.next();
    assertEquals(")",errorNode.getText());
    assertEquals("missing RULE_ID at ')'",errorNode.getSyntaxErrorMessage().getMessage());
}

@Test public void testTryCatchExpression() throws Exception {
    XTryCatchFinallyExpression exp = (XTryCatchFinallyExpression)  
            expressionWithExpectedType("try null catch (java.lang.Throwable t) null finally null", "String");

    assertExpected("java.lang.String", exp.getExpression());
    for (XCatchClause cc : exp.getCatchClauses()) {
        assertExpected("java.lang.String", cc.getExpression());
    }
    assertExpected(null, exp.getFinallyExpression());
}

@Test
public void testTryCatch() {
  try {
    StringConcatenation _builder = new StringConcatenation();
    _builder.append("try 1 catch(Exception e) 2");
    XExpression _expression = this.expression(_builder);
    final XTryCatchFinallyExpression expr = ((XTryCatchFinallyExpression) _expression);
    this.hasImplicitReturns(expr, expr.getExpression(), IterableExtensions.<XCatchClause>head(expr.getCatchClauses()).getExpression());
  } catch (Throwable _e) {
    throw Exceptions.sneakyThrow(_e);
  }
}

@Deprecated
protected void sequence_XTryCatchFinallyExpression(EObject context, XTryCatchFinallyExpression semanticObject) {
    sequence_XTryCatchFinallyExpression(createContext(context, semanticObject), semanticObject);
}

@Override
public void computeTypes(XExpression expression, ITypeComputationState state) {
    if (expression instanceof XAssignment) {
        _computeTypes((XAssignment)expression, state);
    } else if (expression instanceof XAbstractFeatureCall) {
        _computeTypes((XAbstractFeatureCall)expression, state);
    } else if (expression instanceof XDoWhileExpression) {
        _computeTypes((XDoWhileExpression)expression, state);
    } else if (expression instanceof XWhileExpression) {
        _computeTypes((XWhileExpression)expression, state);
    } else if (expression instanceof XBlockExpression) {
        _computeTypes((XBlockExpression)expression, state);
    } else if (expression instanceof XBooleanLiteral) {
        _computeTypes((XBooleanLiteral)expression, state);
    } else if (expression instanceof XCastedExpression) {
        _computeTypes((XCastedExpression)expression, state);
    } else if (expression instanceof XClosure) {
        _computeTypes((XClosure)expression, state);
    } else if (expression instanceof XConstructorCall) {
        _computeTypes((XConstructorCall)expression, state);
    } else if (expression instanceof XForLoopExpression) {
        _computeTypes((XForLoopExpression)expression, state);
    } else if (expression instanceof XBasicForLoopExpression) {
        _computeTypes((XBasicForLoopExpression)expression, state);
    } else if (expression instanceof XIfExpression) {
        _computeTypes((XIfExpression)expression, state);
    } else if (expression instanceof XInstanceOfExpression) {
        _computeTypes((XInstanceOfExpression)expression, state);
    } else if (expression instanceof XNumberLiteral) {
        _computeTypes((XNumberLiteral)expression, state);
    } else if (expression instanceof XNullLiteral) {
        _computeTypes((XNullLiteral)expression, state);
    } else if (expression instanceof XReturnExpression) {
        _computeTypes((XReturnExpression)expression, state);
    } else if (expression instanceof XStringLiteral) {
        _computeTypes((XStringLiteral)expression, state);
    } else if (expression instanceof XSwitchExpression) {
        _computeTypes((XSwitchExpression)expression, state);
    } else if (expression instanceof XThrowExpression) {
        _computeTypes((XThrowExpression)expression, state);
    } else if (expression instanceof XTryCatchFinallyExpression) {
        _computeTypes((XTryCatchFinallyExpression)expression, state);
    } else if (expression instanceof XTypeLiteral) {
        _computeTypes((XTypeLiteral)expression, state);
    } else if (expression instanceof XVariableDeclaration) {
        _computeTypes((XVariableDeclaration)expression, state);
    } else if (expression instanceof XListLiteral) {
        _computeTypes((XListLiteral)expression, state);
    } else if (expression instanceof XSetLiteral) {
        _computeTypes((XSetLiteral)expression, state);
    } else if (expression instanceof XSynchronizedExpression) {
        _computeTypes((XSynchronizedExpression)expression, state);
    } else {
        throw new UnsupportedOperationException("Missing type computation for expression type: " + expression.eClass().getName() + " / " + state);
    }
}

/**
 * Returns <code>true</code> for expressions that seem to be early exit expressions, e.g.
 * <pre>
 *   while(condition) {
 *     if (anotherCondition)
 *       return value
 *     changeResultOfFirstCondition
 *   }
 * </pre>
 */
public boolean isIntentionalEarlyExit(/* @Nullable */ XExpression expression) {
    if (expression == null) {
        return true;
    }
    if (expression instanceof XBlockExpression) {
        XBlockExpression block = (XBlockExpression) expression;
        List<XExpression> children = block.getExpressions();
        for(XExpression child: children) {
            if (isIntentionalEarlyExit(child)) {
                return true;
            }
        }
    } else if (expression instanceof XIfExpression) {
        return isIntentionalEarlyExit(((XIfExpression) expression).getThen()) 
                || isIntentionalEarlyExit(((XIfExpression) expression).getElse());
    } else if (expression instanceof XSwitchExpression) {
        XSwitchExpression switchExpression = (XSwitchExpression) expression;
        for(XCasePart caseExpression: switchExpression.getCases()) {
            if (isIntentionalEarlyExit(caseExpression.getThen())) {
                return true;
            }
        }
        if (isIntentionalEarlyExit(switchExpression.getDefault())) {
            return true;
        }
    } else if (expression instanceof XTryCatchFinallyExpression) {
        XTryCatchFinallyExpression tryCatchFinally = (XTryCatchFinallyExpression) expression;
        if (isIntentionalEarlyExit(tryCatchFinally.getExpression())) {
            for(XCatchClause catchClause: tryCatchFinally.getCatchClauses()) {
                if (!isIntentionalEarlyExit(catchClause.getExpression()))
                    return false;
            }
            return true;
        }
        return false;
    } else if (expression instanceof XAbstractWhileExpression) {
        return isIntentionalEarlyExit(((XAbstractWhileExpression) expression).getBody());
    } else if (expression instanceof XForLoopExpression) {
        return isIntentionalEarlyExit(((XForLoopExpression) expression).getEachExpression());
    } else if (expression instanceof XBasicForLoopExpression) {
        return isIntentionalEarlyExit(((XBasicForLoopExpression) expression).getEachExpression());
    } else if (expression instanceof XSynchronizedExpression) {
        return isIntentionalEarlyExit(((XSynchronizedExpression) expression).getExpression());
    }
    return expression instanceof XReturnExpression || expression instanceof XThrowExpression;
}

public boolean isDefiniteEarlyExit(XExpression expression) {
    // TODO further improvements
    if (expression instanceof XIfExpression) {
        XIfExpression ifExpression = (XIfExpression) expression;
        return isDefiniteEarlyExit(ifExpression.getThen()) && isDefiniteEarlyExit(ifExpression.getElse());
    } else if (expression instanceof XSwitchExpression) {
        XSwitchExpression switchExpression = (XSwitchExpression) expression;
        if (isDefiniteEarlyExit(switchExpression.getDefault())) {
            for(XCasePart caseExpression: switchExpression.getCases()) {
                if (!isDefiniteEarlyExit(caseExpression.getThen())) {
                    return false;
                }
            }
            return true;
        }
        return false;
    } else if (expression instanceof XTryCatchFinallyExpression) {
        XTryCatchFinallyExpression tryExpression = (XTryCatchFinallyExpression) expression;
        if (isDefiniteEarlyExit(tryExpression.getFinallyExpression())) {
            return true;
        }
        if (isDefiniteEarlyExit(tryExpression.getExpression())) {
            for(XCatchClause catchClause: tryExpression.getCatchClauses()) {
                if (!isDefiniteEarlyExit(catchClause.getExpression())) {
                    return false;
                }
            }
            return true;
        }
        return false;
    } else if (expression instanceof XBlockExpression) {
        List<XExpression> expressions = ((XBlockExpression) expression).getExpressions();
        for(int i = expressions.size() - 1; i >= 0; i--) {
            if (isDefiniteEarlyExit(expressions.get(i))) {
                return true;
            }
        }
    } else if (expression instanceof XSynchronizedExpression) {
        return isDefiniteEarlyExit(((XSynchronizedExpression) expression).getExpression());
    }
    return expression instanceof XReturnExpression || expression instanceof XThrowExpression;
}

@Override
protected void doInternalToJavaStatement(XExpression obj, ITreeAppendable appendable, boolean isReferenced) {
    if (obj instanceof XBlockExpression) {
        _toJavaStatement((XBlockExpression) obj, appendable, isReferenced);
    } else if (obj instanceof XCastedExpression) {
        _toJavaStatement((XCastedExpression) obj, appendable, isReferenced);
    } else if (obj instanceof XClosure) {
        _toJavaStatement((XClosure) obj, appendable, isReferenced);
    } else if (obj instanceof XConstructorCall) {
        _toJavaStatement((XConstructorCall) obj, appendable, isReferenced);
    } else if (obj instanceof XDoWhileExpression) {
        _toJavaStatement((XDoWhileExpression) obj, appendable, isReferenced);
    } else if (obj instanceof XForLoopExpression) {
        _toJavaStatement((XForLoopExpression) obj, appendable, isReferenced);
    } else if (obj instanceof XBasicForLoopExpression) {
        _toJavaStatement((XBasicForLoopExpression) obj, appendable, isReferenced);
    } else if (obj instanceof XIfExpression) {
        _toJavaStatement((XIfExpression) obj, appendable, isReferenced);
    } else if (obj instanceof XInstanceOfExpression) {
        _toJavaStatement((XInstanceOfExpression) obj, appendable, isReferenced);
    } else if (obj instanceof XReturnExpression) {
        _toJavaStatement((XReturnExpression) obj, appendable, isReferenced);
    } else if (obj instanceof XSwitchExpression) {
        _toJavaStatement((XSwitchExpression) obj, appendable, isReferenced);
    } else if (obj instanceof XThrowExpression) {
        _toJavaStatement((XThrowExpression) obj, appendable, isReferenced);
    } else if (obj instanceof XTryCatchFinallyExpression) {
        _toJavaStatement((XTryCatchFinallyExpression) obj, appendable, isReferenced);
    } else if (obj instanceof XVariableDeclaration) {
        _toJavaStatement((XVariableDeclaration) obj, appendable, isReferenced);
    } else if (obj instanceof XWhileExpression) {
        _toJavaStatement((XWhileExpression) obj, appendable, isReferenced);
    } else if (obj instanceof XListLiteral) {
        _toJavaStatement((XListLiteral) obj, appendable, isReferenced);
    } else if (obj instanceof XSetLiteral) {
        _toJavaStatement((XSetLiteral) obj, appendable, isReferenced);
    } else if (obj instanceof XSynchronizedExpression) {
        _toJavaStatement((XSynchronizedExpression) obj, appendable, isReferenced);
    } else {
        super.doInternalToJavaStatement(obj, appendable, isReferenced);
    }
}

protected void _toJavaExpression(XTryCatchFinallyExpression expr, ITreeAppendable b) {
    b.trace(expr, false).append(getVarName(expr, b));
}

/**
 * don't call this directly. Always call evaluate() internalEvaluate()
 */
protected Object doEvaluate(XExpression expression, IEvaluationContext context, CancelIndicator indicator) {
    if (expression instanceof XAssignment) {
      return _doEvaluate((XAssignment)expression, context, indicator);
    } else if (expression instanceof XDoWhileExpression) {
      return _doEvaluate((XDoWhileExpression)expression, context, indicator);
    } else if (expression instanceof XMemberFeatureCall) {
      return _doEvaluate((XMemberFeatureCall)expression, context, indicator);
    } else if (expression instanceof XWhileExpression) {
      return _doEvaluate((XWhileExpression)expression, context, indicator);
    } else if (expression instanceof XFeatureCall) {
        return _doEvaluate((XFeatureCall)expression, context, indicator);
    } else if (expression instanceof XAbstractFeatureCall) {
        return _doEvaluate((XAbstractFeatureCall)expression, context, indicator);
    } else if (expression instanceof XBlockExpression) {
      return _doEvaluate((XBlockExpression)expression, context, indicator);
    } else if (expression instanceof XSynchronizedExpression) {
      return _doEvaluate((XSynchronizedExpression)expression, context, indicator);
    } else if (expression instanceof XBooleanLiteral) {
      return _doEvaluate((XBooleanLiteral)expression, context, indicator);
    } else if (expression instanceof XCastedExpression) {
      return _doEvaluate((XCastedExpression)expression, context, indicator);
    } else if (expression instanceof XClosure) {
      return _doEvaluate((XClosure)expression, context, indicator);
    } else if (expression instanceof XConstructorCall) {
      return _doEvaluate((XConstructorCall)expression, context, indicator);
    } else if (expression instanceof XForLoopExpression) {
      return _doEvaluate((XForLoopExpression)expression, context, indicator);
    } else if (expression instanceof XBasicForLoopExpression) {
      return _doEvaluate((XBasicForLoopExpression)expression, context, indicator);
    } else if (expression instanceof XIfExpression) {
      return _doEvaluate((XIfExpression)expression, context, indicator);
    } else if (expression instanceof XInstanceOfExpression) {
      return _doEvaluate((XInstanceOfExpression)expression, context, indicator);
    } else if (expression instanceof XNullLiteral) {
      return _doEvaluate((XNullLiteral)expression, context, indicator);
    } else if (expression instanceof XNumberLiteral) {
      return _doEvaluate((XNumberLiteral)expression, context, indicator);
    } else if (expression instanceof XReturnExpression) {
      return _doEvaluate((XReturnExpression)expression, context, indicator);
    } else if (expression instanceof XStringLiteral) {
      return _doEvaluate((XStringLiteral)expression, context, indicator);
    } else if (expression instanceof XSwitchExpression) {
      return _doEvaluate((XSwitchExpression)expression, context, indicator);
    } else if (expression instanceof XThrowExpression) {
      return _doEvaluate((XThrowExpression)expression, context, indicator);
    } else if (expression instanceof XTryCatchFinallyExpression) {
      return _doEvaluate((XTryCatchFinallyExpression)expression, context, indicator);
    } else if (expression instanceof XTypeLiteral) {
      return _doEvaluate((XTypeLiteral)expression, context, indicator);
    } else if (expression instanceof XVariableDeclaration) {
          return _doEvaluate((XVariableDeclaration)expression, context, indicator);
    } else if (expression instanceof XListLiteral) {
          return _doEvaluate((XListLiteral)expression, context, indicator);
    } else if (expression instanceof XSetLiteral) {
          return _doEvaluate((XSetLiteral)expression, context, indicator);
    } else {
      throw new IllegalArgumentException("Unhandled parameter types: " +
        Arrays.<Object>asList(expression, context, indicator).toString());
    }
}

public void findImplicitReturns(final XExpression expression, final ImplicitReturnFinder.Acceptor acceptor) {
  if (expression instanceof XAbstractFeatureCall) {
    _findImplicitReturns((XAbstractFeatureCall)expression, acceptor);
    return;
  } else if (expression instanceof XBlockExpression) {
    _findImplicitReturns((XBlockExpression)expression, acceptor);
    return;
  } else if (expression instanceof XBooleanLiteral) {
    _findImplicitReturns((XBooleanLiteral)expression, acceptor);
    return;
  } else if (expression instanceof XCastedExpression) {
    _findImplicitReturns((XCastedExpression)expression, acceptor);
    return;
  } else if (expression instanceof XClosure) {
    _findImplicitReturns((XClosure)expression, acceptor);
    return;
  } else if (expression instanceof XCollectionLiteral) {
    _findImplicitReturns((XCollectionLiteral)expression, acceptor);
    return;
  } else if (expression instanceof XConstructorCall) {
    _findImplicitReturns((XConstructorCall)expression, acceptor);
    return;
  } else if (expression instanceof XIfExpression) {
    _findImplicitReturns((XIfExpression)expression, acceptor);
    return;
  } else if (expression instanceof XInstanceOfExpression) {
    _findImplicitReturns((XInstanceOfExpression)expression, acceptor);
    return;
  } else if (expression instanceof XNullLiteral) {
    _findImplicitReturns((XNullLiteral)expression, acceptor);
    return;
  } else if (expression instanceof XNumberLiteral) {
    _findImplicitReturns((XNumberLiteral)expression, acceptor);
    return;
  } else if (expression instanceof XStringLiteral) {
    _findImplicitReturns((XStringLiteral)expression, acceptor);
    return;
  } else if (expression instanceof XSwitchExpression) {
    _findImplicitReturns((XSwitchExpression)expression, acceptor);
    return;
  } else if (expression instanceof XSynchronizedExpression) {
    _findImplicitReturns((XSynchronizedExpression)expression, acceptor);
    return;
  } else if (expression instanceof XTryCatchFinallyExpression) {
    _findImplicitReturns((XTryCatchFinallyExpression)expression, acceptor);
    return;
  } else if (expression instanceof XTypeLiteral) {
    _findImplicitReturns((XTypeLiteral)expression, acceptor);
    return;
  } else if (expression != null) {
    _findImplicitReturns(expression, acceptor);
    return;
  } else if (expression == null) {
    _findImplicitReturns((Void)null, acceptor);
    return;
  } else {
    throw new IllegalArgumentException("Unhandled parameter types: " +
      Arrays.<Object>asList(expression, acceptor).toString());
  }
}

@Test public void testTryCatchExpression() throws Exception {
    XTryCatchFinallyExpression tryEx = (XTryCatchFinallyExpression) expression(
            "try throw foo catch (Exception e) bar finally baz");
    doTestTryCatchExpression(tryEx);
}

@Test public void testTryCatchExpression_1() throws Exception {
    XTryCatchFinallyExpression tryEx = (XTryCatchFinallyExpression) expression(
    "try foo finally bar");
    assertFeatureCall("foo", tryEx.getExpression());
    assertFeatureCall("bar", tryEx.getFinallyExpression());
}

@Test public void testTryCatchExpression_2() throws Exception {
    XTryCatchFinallyExpression tryEx = (XTryCatchFinallyExpression) expression(
    "try foo catch (java.lang.Exception e) bar");
    doTestTryCatchExpression_2(tryEx);
}

@Test public void testTryCatch_0() throws Exception {
    XTryCatchFinallyExpression exp = (XTryCatchFinallyExpression) expression("try 'foo' catch (Exception e) e",true);
    XCatchClause xCatchClause = exp.getCatchClauses().get(0);
    assertSame(xCatchClause.getDeclaredParam(), ((XFeatureCall)xCatchClause.getExpression()).getFeature());
}

/**
 * Contexts:
 *     XExpression returns XTryCatchFinallyExpression
 *     XAssignment returns XTryCatchFinallyExpression
 *     XAssignment.XBinaryOperation_1_1_0_0_0 returns XTryCatchFinallyExpression
 *     XOrExpression returns XTryCatchFinallyExpression
 *     XOrExpression.XBinaryOperation_1_0_0_0 returns XTryCatchFinallyExpression
 *     XAndExpression returns XTryCatchFinallyExpression
 *     XAndExpression.XBinaryOperation_1_0_0_0 returns XTryCatchFinallyExpression
 *     XEqualityExpression returns XTryCatchFinallyExpression
 *     XEqualityExpression.XBinaryOperation_1_0_0_0 returns XTryCatchFinallyExpression
 *     XRelationalExpression returns XTryCatchFinallyExpression
 *     XRelationalExpression.XInstanceOfExpression_1_0_0_0_0 returns XTryCatchFinallyExpression
 *     XRelationalExpression.XBinaryOperation_1_1_0_0_0 returns XTryCatchFinallyExpression
 *     XOtherOperatorExpression returns XTryCatchFinallyExpression
 *     XOtherOperatorExpression.XBinaryOperation_1_0_0_0 returns XTryCatchFinallyExpression
 *     XAdditiveExpression returns XTryCatchFinallyExpression
 *     XAdditiveExpression.XBinaryOperation_1_0_0_0 returns XTryCatchFinallyExpression
 *     XMultiplicativeExpression returns XTryCatchFinallyExpression
 *     XMultiplicativeExpression.XBinaryOperation_1_0_0_0 returns XTryCatchFinallyExpression
 *     XUnaryOperation returns XTryCatchFinallyExpression
 *     XCastedExpression returns XTryCatchFinallyExpression
 *     XCastedExpression.XCastedExpression_1_0_0_0 returns XTryCatchFinallyExpression
 *     XPostfixOperation returns XTryCatchFinallyExpression
 *     XPostfixOperation.XPostfixOperation_1_0_0 returns XTryCatchFinallyExpression
 *     XMemberFeatureCall returns XTryCatchFinallyExpression
 *     XMemberFeatureCall.XAssignment_1_0_0_0_0 returns XTryCatchFinallyExpression
 *     XMemberFeatureCall.XMemberFeatureCall_1_1_0_0_0 returns XTryCatchFinallyExpression
 *     XPrimaryExpression returns XTryCatchFinallyExpression
 *     XParenthesizedExpression returns XTryCatchFinallyExpression
 *     XExpressionOrVarDeclaration returns XTryCatchFinallyExpression
 *     XTryCatchFinallyExpression returns XTryCatchFinallyExpression
 *
 * Constraint:
 *     (expression=XExpression ((catchClauses+=XCatchClause+ finallyExpression=XExpression?) | finallyExpression=XExpression))
 */
protected void sequence_XTryCatchFinallyExpression(ISerializationContext context, XTryCatchFinallyExpression semanticObject) {
    genericSequencer.createSequence(context, semanticObject);
}

/**
 * Constraint:
 *     (expression=XExpression ((catchClauses+=XCatchClause+ finallyExpression=XExpression?) | finallyExpression=XExpression))
 */
protected void sequence_XTryCatchFinallyExpression(EObject context, XTryCatchFinallyExpression semanticObject) {
    genericSequencer.createSequence(context, semanticObject);
}

/**
 * Constraint:
 *     (expression=XExpression ((catchClauses+=XCatchClause+ finallyExpression=XExpression?) | finallyExpression=XExpression))
 */
protected void sequence_XTryCatchFinallyExpression(EObject context, XTryCatchFinallyExpression semanticObject) {
    genericSequencer.createSequence(context, semanticObject);
}