如何使用Eclipse JDT代码格式化程序在方法和类型注释之后插入新行？

Question

@Annotation1 
@Annotation2
@Annotation3
@Annotation4 
public class TheClass {

    private static final int PAGE_SIZE = 10;

    @Annotation5 
    private Object o1;

    @Annotation5 
    private Object o2;


    @Annotation6
    @Annotation7 
    public void doSomething(@Annotation8 @Annotation Object dto) {
         // some works
    }
}

这是格式化程序代码：

public String format(String code)
        throws MalformedTreeException, BadLocationException {
    Map options = new java.util.HashMap();
    options.put(JavaCore.COMPILER_SOURCE, "1.5");
    options.put(JavaCore.COMPILER_COMPLIANCE, "1.5");
    options.put(JavaCore.COMPILER_CODEGEN_TARGET_PLATFORM, "1.5");

    DefaultCodeFormatterOptions cfOptions =
            DefaultCodeFormatterOptions.getDefaultSettings();
    cfOptions.insert_new_line_after_annotation = false;
    cfOptions.comment_insert_new_line_for_parameter = true;

    cfOptions.blank_lines_before_method = 1;
    cfOptions.number_of_empty_lines_to_preserve= 1;

    cfOptions.tab_char = DefaultCodeFormatterOptions.SPACE;

    CodeFormatter cf = new DefaultCodeFormatter(cfOptions, options);

    TextEdit te = cf.format(CodeFormatter.K_UNKNOWN, code, 0,
            code.length(), 0, null);
    IDocument dc = new Document(code);

    te.apply(dc);
    return dc.get();
}

Answer 1

对于注释的每个可能的上下文，DefaultCodeFormatterOptions对注释后的新行都有单独的字段

public boolean insert_new_line_after_annotation_on_type;
public boolean insert_new_line_after_annotation_on_field;
public boolean insert_new_line_after_annotation_on_method;
public boolean insert_new_line_after_annotation_on_package;
public boolean insert_new_line_after_annotation_on_parameter;
public boolean insert_new_line_after_annotation_on_local_variable;

所以我猜insert_new_line_after_annotation_on_type就是答案...我已经用IDE本身而不是API检查了这种行为是否符合预期。

这是2014年2月该提交为修复bug/feature 425040而添加的相对较新的内容。它在我面前的eclipse 4.4.0中可用