com.sun.source.tree.LambdaExpressionTree.BodyKind#STATEMENT源码实例Demo

@Override
public void visitLambda(JCLambda tree) {
  if (tree.getBodyKind() == BodyKind.STATEMENT) {
    JCExpression ident = make.at(tree).QualIdent(symtab.assertionErrorType.tsym);
    JCThrow throwTree = make.Throw(make.NewClass(null, List.nil(), ident, List.nil(), null));
    tree.body = make.Block(0, List.of(throwTree));
  }
}
 

@Override
public BodyKind getBodyKind() {
    return body.hasTag(BLOCK) ?
            BodyKind.STATEMENT :
            BodyKind.EXPRESSION;
}
 

@Override
public BodyKind getBodyKind() {
    return body.hasTag(BLOCK) ?
            BodyKind.STATEMENT :
            BodyKind.EXPRESSION;
}
 

@Override
public BodyKind getBodyKind() {
    return body.hasTag(BLOCK) ?
            BodyKind.STATEMENT :
            BodyKind.EXPRESSION;
}
 

@Override
public void visitLambda(JCLambda tree) {
    boolean useParens = cs.parensAroundSingularLambdaParam() ||
                        tree.params.size() != 1 ||
                        tree.paramKind != JCLambda.ParameterKind.IMPLICIT;
    if (useParens) {
        print(cs.spaceWithinLambdaParens() && tree.params.nonEmpty() ? "( " : "(");
    }
    boolean oldPrintingMethodParams = printingMethodParams;
    printingMethodParams = true;
    suppressVariableType = tree.paramKind == JCLambda.ParameterKind.IMPLICIT;
    wrapTrees(tree.params, cs.wrapLambdaParams(), cs.alignMultilineLambdaParams()
            ? out.col : out.leftMargin + cs.getContinuationIndentSize(),
              true);
    suppressVariableType = false;
    printingMethodParams = oldPrintingMethodParams;
    if (useParens) {
        if (cs.spaceWithinLambdaParens() && tree.params.nonEmpty())
            needSpace();
        print(')');
    }
    print(cs.spaceAroundLambdaArrow() ? " ->" : "->");
    if (tree.getBodyKind() == BodyKind.STATEMENT) {
        printBlock(tree.body, cs.getOtherBracePlacement(), cs.spaceAroundLambdaArrow());
    } else {
        int rm = cs.getRightMargin();
        switch(cs.wrapBinaryOps()) {
        case WRAP_IF_LONG:
            if (widthEstimator.estimateWidth(tree.body, rm - out.col) + out.col <= cs.getRightMargin()) {
                if(cs.spaceAroundLambdaArrow())
                    print(' ');
                break;
            }
        case WRAP_ALWAYS:
            newline();
            toColExactly(out.leftMargin + cs.getContinuationIndentSize());
            break;
        case WRAP_NEVER:
            if(cs.spaceAroundLambdaArrow())
                print(' ');
            break;
        }
        printExpr(tree.body, TreeInfo.notExpression);
    }
}
 

@Override
public BodyKind getBodyKind() {
    return body.hasTag(BLOCK) ?
            BodyKind.STATEMENT :
            BodyKind.EXPRESSION;
}
 

@Override
public BodyKind getBodyKind() {
    return body.hasTag(BLOCK) ?
            BodyKind.STATEMENT :
            BodyKind.EXPRESSION;
}
 

@Override
public BodyKind getBodyKind() {
    return body.hasTag(BLOCK) ?
            BodyKind.STATEMENT :
            BodyKind.EXPRESSION;
}
 

@Override
public BodyKind getBodyKind() {
    return body.hasTag(BLOCK) ?
            BodyKind.STATEMENT :
            BodyKind.EXPRESSION;
}