com.sun.tools.javac.tree.JCTree.JCIf Java Examples

public void visitIf(JCIf tree) {
	try {
		print("if ");
		if (PARENS.equals(treeTag(tree.cond))) {
			printExpr(tree.cond);
		} else {
			print("(");
			printExpr(tree.cond);
			print(")");
		}
		print(" ");
		printStat(tree.thenpart);
		if (tree.elsepart != null) {
			print(" else ");
			printStat(tree.elsepart);
		}
	} catch (IOException e) {
		throw new UncheckedIOException(e);
	}
}
 

public void visitIf(JCIf tree) {
    scanCond(tree.cond);
    final Bits initsBeforeElse = new Bits(initsWhenFalse);
    final Bits uninitsBeforeElse = new Bits(uninitsWhenFalse);
    inits.assign(initsWhenTrue);
    uninits.assign(uninitsWhenTrue);
    scan(tree.thenpart);
    if (tree.elsepart != null) {
        final Bits initsAfterThen = new Bits(inits);
        final Bits uninitsAfterThen = new Bits(uninits);
        inits.assign(initsBeforeElse);
        uninits.assign(uninitsBeforeElse);
        scan(tree.elsepart);
        inits.andSet(initsAfterThen);
        uninits.andSet(uninitsAfterThen);
    } else {
        inits.andSet(initsBeforeElse);
        uninits.andSet(uninitsBeforeElse);
    }
}
 

/** Visitor method for if statements.
 */
public void visitIf(JCIf tree) {
    JCTree cond = tree.cond = translate(tree.cond, syms.booleanType);
    if (isTrue(cond)) {
        result = translate(tree.thenpart);
        addPrunedInfo(cond);
    } else if (isFalse(cond)) {
        if (tree.elsepart != null) {
            result = translate(tree.elsepart);
        } else {
            result = make.Skip();
        }
        addPrunedInfo(cond);
    } else {
        // Condition is not a compile-time constant.
        tree.thenpart = translate(tree.thenpart);
        tree.elsepart = translate(tree.elsepart);
        result = tree;
    }
}
 

private IfStatement convertIf(JCIf statement) {
  return IfStatement.newBuilder()
      .setSourcePosition(getSourcePosition(statement))
      .setConditionExpression(convertConditionRemovingOuterParentheses(statement.getCondition()))
      .setThenStatement(convertStatement(statement.getThenStatement()))
      .setElseStatement(convertStatementOrNull(statement.getElseStatement()))
      .build();
}
 

@Override
public JCIf inline(Inliner inliner) throws CouldNotResolveImportException {
  return inliner.maker().If(
      getCondition().inline(inliner),
      getThenStatement().inline(inliner),
      (getElseStatement() == null) ? null : getElseStatement().inline(inliner));
}
 

/**
 * Checks if the statement is of the form 'if (x == null) {throw WHATEVER;},
 * where the block braces are optional. If it is of this form, returns "x".
 * If it is not of this form, returns null.
 */
public String returnVarNameIfNullCheck(JCStatement stat) {
	if (!(stat instanceof JCIf)) return null;
	
	/* Check that the if's statement is a throw statement, possibly in a block. */ {
		JCStatement then = ((JCIf) stat).thenpart;
		if (then instanceof JCBlock) {
			List<JCStatement> stats = ((JCBlock) then).stats;
			if (stats.length() == 0) return null;
			then = stats.get(0);
		}
		if (!(then instanceof JCThrow)) return null;
	}
	
	/* Check that the if's conditional is like 'x == null'. Return from this method (don't generate
	   a nullcheck) if 'x' is equal to our own variable's name: There's already a nullcheck here. */ {
		JCExpression cond = ((JCIf) stat).cond;
		while (cond instanceof JCParens) cond = ((JCParens) cond).expr;
		if (!(cond instanceof JCBinary)) return null;
		JCBinary bin = (JCBinary) cond;
		if (!CTC_EQUAL.equals(treeTag(bin))) return null;
		if (!(bin.lhs instanceof JCIdent)) return null;
		if (!(bin.rhs instanceof JCLiteral)) return null;
		if (!CTC_BOT.equals(typeTag(bin.rhs))) return null;
		return ((JCIdent) bin.lhs).name.toString();
	}
}
 

public void visitIf(JCIf tree) {
    SourceRange sr = new SourceRange(startPos(tree), endPos(tree));
    sr.mergeWith(csp(tree.cond));
    sr.mergeWith(csp(tree.thenpart));
    sr.mergeWith(csp(tree.elsepart));
    result = sr;
}
 

private JCStatement makeTwrCloseStatement(Symbol primaryException, JCExpression resource) {
    // primaryException.addSuppressed(catchException);
    VarSymbol catchException =
        new VarSymbol(SYNTHETIC, make.paramName(2),
                      syms.throwableType,
                      currentMethodSym);
    JCStatement addSuppressionStatement =
        make.Exec(makeCall(make.Ident(primaryException),
                           names.addSuppressed,
                           List.of(make.Ident(catchException))));

    // try { resource.close(); } catch (e) { primaryException.addSuppressed(e); }
    JCBlock tryBlock =
        make.Block(0L, List.of(makeResourceCloseInvocation(resource)));
    JCVariableDecl catchExceptionDecl = make.VarDef(catchException, null);
    JCBlock catchBlock = make.Block(0L, List.of(addSuppressionStatement));
    List<JCCatch> catchClauses = List.of(make.Catch(catchExceptionDecl, catchBlock));
    JCTry tryTree = make.Try(tryBlock, catchClauses, null);
    tryTree.finallyCanCompleteNormally = true;

    // if (primaryException != null) {try...} else resourceClose;
    JCIf closeIfStatement = make.If(makeNonNullCheck(make.Ident(primaryException)),
                                    tryTree,
                                    makeResourceCloseInvocation(resource));

    return closeIfStatement;
}
 

@Override
public void visitIf(JCIf tree) {
    scan(tree.cond);
    scan(tree.thenpart);
    if (tree.elsepart != null) {
        scan(tree.elsepart);
    }
}
 

@Override
public void visitIf(JCIf tree) {
    scan(tree.cond);
    scanStat(tree.thenpart);
    if (tree.elsepart != null) {
        boolean aliveAfterThen = alive;
        alive = true;
        scanStat(tree.elsepart);
        alive = alive | aliveAfterThen;
    } else {
        alive = true;
    }
}
 

@Override
public void visitIf(JCIf tree) {
    //skip body (to prevents same statements to be analyzed twice)
    scan(tree.getCondition());
}
 

private Statement convertStatement(JCStatement jcStatement) {
  switch (jcStatement.getKind()) {
    case ASSERT:
      return convertAssert((JCAssert) jcStatement);
    case BLOCK:
      return convertBlock((JCBlock) jcStatement);
    case BREAK:
      return convertBreak((JCBreak) jcStatement);
    case CLASS:
      convertClassDeclaration((JCClassDecl) jcStatement);
      return null;
    case CONTINUE:
      return convertContinue((JCContinue) jcStatement);
    case DO_WHILE_LOOP:
      return convertDoWhileLoop((JCDoWhileLoop) jcStatement);
    case EMPTY_STATEMENT:
      return new EmptyStatement(getSourcePosition(jcStatement));
    case ENHANCED_FOR_LOOP:
      return convertEnhancedForLoop((JCEnhancedForLoop) jcStatement);
    case EXPRESSION_STATEMENT:
      return convertExpressionStatement((JCExpressionStatement) jcStatement);
    case FOR_LOOP:
      return convertForLoop((JCForLoop) jcStatement);
    case IF:
      return convertIf((JCIf) jcStatement);
    case LABELED_STATEMENT:
      return convertLabeledStatement((JCLabeledStatement) jcStatement);
    case RETURN:
      return convertReturn((JCReturn) jcStatement);
    case SWITCH:
      return convertSwitch((JCSwitch) jcStatement);
    case THROW:
      return convertThrow((JCThrow) jcStatement);
    case TRY:
      return convertTry((JCTry) jcStatement);
    case VARIABLE:
      return convertVariableDeclaration((JCVariableDecl) jcStatement);
    case WHILE_LOOP:
      return convertWhileLoop((JCWhileLoop) jcStatement);
    case SYNCHRONIZED:
      return convertSynchronized((JCSynchronized) jcStatement);
    default:
      throw new AssertionError("Unknown statement node type: " + jcStatement.getKind());
  }
}
 

@Override
public void visitIf(JCIf tree) {
    scan(tree.getCondition());
}
 

public JCIf If(JCExpression cond, JCStatement thenpart, JCStatement elsepart) {
	return invoke(If, cond, thenpart, elsepart);
}
 

@Override public void handle(AnnotationValues<Cleanup> annotation, JCAnnotation ast, JavacNode annotationNode) {
	handleFlagUsage(annotationNode, ConfigurationKeys.CLEANUP_FLAG_USAGE, "@Cleanup");
	
	if (inNetbeansEditor(annotationNode)) return;
	
	deleteAnnotationIfNeccessary(annotationNode, Cleanup.class);
	String cleanupName = annotation.getInstance().value();
	if (cleanupName.length() == 0) {
		annotationNode.addError("cleanupName cannot be the empty string.");
		return;
	}
	
	if (annotationNode.up().getKind() != Kind.LOCAL) {
		annotationNode.addError("@Cleanup is legal only on local variable declarations.");
		return;
	}
	
	JCVariableDecl decl = (JCVariableDecl)annotationNode.up().get();
	
	if (decl.init == null) {
		annotationNode.addError("@Cleanup variable declarations need to be initialized.");
		return;
	}
	
	JavacNode ancestor = annotationNode.up().directUp();
	JCTree blockNode = ancestor.get();
	
	final List<JCStatement> statements;
	if (blockNode instanceof JCBlock) {
		statements = ((JCBlock)blockNode).stats;
	} else if (blockNode instanceof JCCase) {
		statements = ((JCCase)blockNode).stats;
	} else if (blockNode instanceof JCMethodDecl) {
		statements = ((JCMethodDecl)blockNode).body.stats;
	} else {
		annotationNode.addError("@Cleanup is legal only on a local variable declaration inside a block.");
		return;
	}
	
	boolean seenDeclaration = false;
	ListBuffer<JCStatement> newStatements = new ListBuffer<JCStatement>();
	ListBuffer<JCStatement> tryBlock = new ListBuffer<JCStatement>();
	for (JCStatement statement : statements) {
		if (!seenDeclaration) {
			if (statement == decl) seenDeclaration = true;
			newStatements.append(statement);
		} else {
			tryBlock.append(statement);
		}
	}
	
	if (!seenDeclaration) {
		annotationNode.addError("LOMBOK BUG: Can't find this local variable declaration inside its parent.");
		return;
	}
	doAssignmentCheck(annotationNode, tryBlock.toList(), decl.name);
	
	JavacTreeMaker maker = annotationNode.getTreeMaker();
	JCFieldAccess cleanupMethod = maker.Select(maker.Ident(decl.name), annotationNode.toName(cleanupName));
	List<JCStatement> cleanupCall = List.<JCStatement>of(maker.Exec(
			maker.Apply(List.<JCExpression>nil(), cleanupMethod, List.<JCExpression>nil())));
	
	JCExpression preventNullAnalysis = preventNullAnalysis(maker, annotationNode, maker.Ident(decl.name));
	JCBinary isNull = maker.Binary(CTC_NOT_EQUAL, preventNullAnalysis, maker.Literal(CTC_BOT, null));
	
	JCIf ifNotNullCleanup = maker.If(isNull, maker.Block(0, cleanupCall), null);
	
	Context context = annotationNode.getContext();
	JCBlock finalizer = recursiveSetGeneratedBy(maker.Block(0, List.<JCStatement>of(ifNotNullCleanup)), ast, context);
	
	newStatements.append(setGeneratedBy(maker.Try(setGeneratedBy(maker.Block(0, tryBlock.toList()), ast, context), List.<JCCatch>nil(), finalizer), ast, context));
	
	if (blockNode instanceof JCBlock) {
		((JCBlock)blockNode).stats = newStatements.toList();
	} else if (blockNode instanceof JCCase) {
		((JCCase)blockNode).stats = newStatements.toList();
	} else if (blockNode instanceof JCMethodDecl) {
		((JCMethodDecl)blockNode).body.stats = newStatements.toList();
	} else throw new AssertionError("Should not get here");
	
	ancestor.rebuild();
}
 

/**
 * Check for empty statements after if
 */
void checkEmptyIf(JCIf tree) {
    if (tree.thenpart.hasTag(SKIP) && tree.elsepart == null &&
            lint.isEnabled(LintCategory.EMPTY))
        log.warning(LintCategory.EMPTY, tree.thenpart.pos(), Warnings.EmptyIf);
}
 

public JCIf build() {
    return treeMaker.If(condition, thenBlock, elseBlock);
}
 

public void visitIf(JCIf tree) {
    tree.cond = translate(tree.cond, syms.booleanType);
    tree.thenpart = translate(tree.thenpart);
    tree.elsepart = translate(tree.elsepart);
    result = tree;
}
 

JCIf build();