private Map<String, El> exps;
public AbstractPathView(String dest) {
if (null != dest) {
this.dest = new CharSegment(Strings.trim(dest));
this.exps = new HashMap<String, El>();
// 预先将每个占位符解析成表达式
for (String key : this.dest.keys()) {
this.exps.put(key, new El(key));
}