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package com.bestvike.linq.enumerable;

import com.bestvike.linq.IEnumerable;
import com.bestvike.linq.IEnumerator;

/**
 * 迭代对象,初始 state 为 1
 * 
 * Created by 许崇雷 on 2017-07-13.
 */
public abstract class AbstractIterator extends AbstractEnumerator implements IEnumerable {
    private final long threadId;

    public AbstractIterator() {
        this.threadId = Thread.currentThread().getId();
    }

    @Override
    public abstract AbstractIterator clone();

    @Override
    public IEnumerator enumerator() {
        AbstractIterator enumerator = this.state == 0 && this.threadId == Thread.currentThread().getId() ? this : this.clone();
        enumerator.state = 1;
        return enumerator;
    }
}