com.iohao.game.common.kit.adapter.HuComputeIter Maven / Gradle / Ivy
package com.iohao.game.common.kit.adapter;
import java.util.Iterator;
import java.util.NoSuchElementException;
/**
* @author 渔民小镇
* @date 2023-01-19
*/
abstract class HuComputeIter implements Iterator {
private T next;
private boolean finished;
protected abstract T computeNext();
@Override
public boolean hasNext() {
if (null != next) {
// 用户读取了节点，但是没有使用
return true;
} else if (finished) {
// 读取结束
return false;
}
T result = computeNext();
if (null == result) {
// 不再有新的节点，结束
this.finished = true;
return false;
} else {
this.next = result;
return true;
}
}
@Override
public T next() {
if (!hasNext()) {
throw new NoSuchElementException("No more lines");
}
T result = this.next;
// 清空cache，表示此节点读取完毕，下次计算新节点
this.next = null;
return result;
}
}