JSF自定义组件？如何添加方法表达式支持？

Question

我想在我的自定义组件上添加Method Expression支持。 我已经看到我必须写一个tagHandler。

我看过这篇文章： How to add Method Expression to a custom JSF component

我不明白methodRule方法的参数“void.class”和“moveEvent”是什么。

这是我的customComponent代码：

public class Link extends UIOutput{

private StringBuilder style = new StringBuilder();
private String id = "";
private Boolean active = false;
private String alt = "";
private String href = "";
private String hreflang = "";
private String rel = "";
private String target = "";
private String download = "";
private String media = "";
private String type = "";


public Boolean isActive() {
    return active;
}

public void setActive(Boolean active) {
    this.active = active;
}

public String getAlt() {
    return alt;
}

public void setAlt(String alt) {
    this.alt = alt;
}

public String getHref() {
    return href;
}

public void setHref(String href) {
    this.href = href;
}

public String getHreflang() {
    return hreflang;
}

public void setHreflang(String hreflang) {
    this.hreflang = hreflang;
}

public String getRel() {
    return rel;
}

public void setRel(String rel) {
    this.rel = rel;
}

public String getTarget() {
    return target;
}

public void setTarget(String target) {
    this.target = target;
}

public String getDownload() {
    return download;
}

public void setDownload(String download) {
    this.download = download;
}

public String getMedia() {
    return media;
}

public void setMedia(String media) {
    this.media = media;
}

public String getType() {
    return type;
}

public void setType(String type) {
    this.type = type;
}



@Override
public void encodeBegin(FacesContext context)throws IOException {
    ResponseWriter writer = context.getResponseWriter();
    String clientId = getClientId(context);
    if("".equals(id) || id == null){
        id = clientId;
    }
    Object styleClass = (getAttributes().get("styleClass") != null) ? (Boolean)getAttributes().get("styleClass") : "";
    writer.startElement("li", this);
    if(active){
        style.append(" active ");
    }
    if(!"".equals(styleClass)){
        style.append(styleClass);
    }
    writer.writeAttribute("id", id, null);

    writer.writeAttribute("class", style.toString().trim(), null);
    writer.startElement("a", this);
    writer.writeAttribute("href", href, null);
    if(!"".equals(alt)) { writer.writeAttribute("alt", alt, null); }
    if(!"".equals(hreflang)) { writer.writeAttribute("hreflang", hreflang, null); }
    System.out.println("rel = " + rel);
    if(!"".equals(rel)) { writer.writeAttribute("rel", rel, null); }
    if(!"".equals(target)) {  writer.writeAttribute("target", target, null); }
    if(!"".equals(download)) {  writer.writeAttribute("download", download, null); }
    if(!"".equals(media)) {  writer.writeAttribute("media", media, null); }
    if(!"".equals(type)) {  writer.writeAttribute("type", type, null); }
    for (UIComponent child : getChildren()) {
        child.encodeAll(context);
    }
}

@Override
public Object saveState(FacesContext context) {
    Object values[] = new Object[10];
    values[0] = super.saveState(context);
    values[1] = id;
    values[2] = style;
    values[3] = active;
    values[4] = alt;
    values[5] = href;
    values[6] = hreflang;
    values[7] = rel;
    values[8] = target;
    values[9] = download;
    values[10] = media;
    values[110] = type;
    return ((Object) (values));
}

@Override
public void restoreState(FacesContext context, Object state) {
    Object values[] = (Object[])state;
    super.restoreState(context, values[0]);
    id = (String)values[1];
    style.insert(0, values[2]);
    active = (Boolean)values[3];
    alt = (String)values[4];
    href = (String)values[5];
    hreflang = (String)values[6];
    rel = (String)values[7];
    target = (String)values[8];
    download = (String)values[9];
    media = (String)values[10];
    type = (String)values[11];
}

}