MyBatis框架迭代器模式实现原理解析

import java.util.Iterator;

/**
 * @author Clinton Begin
 */
public class PropertyTokenizer implements Iterator<PropertyTokenizer> {
 private String name;
 private final String indexedName;
 private String index;
 private final String children; // 通过这个children属性建立前后两次迭代的关系

 public PropertyTokenizer(String fullname) {
  int delim = fullname.indexOf('.');
  if (delim > -1) {
   name = fullname.substring(0, delim);
   children = fullname.substring(delim + 1);
  } else {
   name = fullname;
   children = null;
  }
  indexedName = name;
  delim = name.indexOf('[');
  if (delim > -1) {
   index = name.substring(delim + 1, name.length() - 1);
   name = name.substring(0, delim);
  }
 }

 public String getName() {
  return name;
 }

 public String getIndex() {
  return index;
 }

 public String getIndexedName() {
  return indexedName;
 }

 public String getChildren() {
  return children;
 }

 @Override
 public boolean hasNext() {
  return children != null;
 }

 @Override
 public PropertyTokenizer next() {
  return new PropertyTokenizer(children);
 }

 @Override
 public void remove() {
  throw new UnsupportedOperationException("Remove is not supported, as it has no meaning in the context of properties.");
 }
}