Mercurial > hg > Members > tatsuki > bench > jungle-core
view src/main/java/jp/ac/u_ryukyu/ie/cr/shoshi/jungle/store/impl/DefaultChildren.java @ 19:703f0be5368a
added attribute cache
author | Shoshi TAMAKI |
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date | Thu, 20 Dec 2012 18:09:17 +0900 |
parents | a46ff0114a9e |
children | 848f73545c4d |
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package jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.impl; import java.util.Iterator; import fj.P2; import fj.data.List; import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.core.Children; import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.core.Node; import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.util.IterableWrapper; public class DefaultChildren implements Children { private final List<DefaultNode> children; private static final List<DefaultNode> EMPTY = List.nil(); public DefaultChildren() { this(EMPTY); } public DefaultChildren(List<DefaultNode> _children) { children = _children; } @Override public int size() { return children.length(); } public DefaultChildren add(DefaultNode _newNode) { return new DefaultChildren(children.snoc(_newNode)); } public DefaultChildren insert(DefaultNode _newNode,int _pos) { check(_pos); P2<List<DefaultNode>,List<DefaultNode>> split = children.splitAt(_pos); List<DefaultNode> newChildren = split._1().snoc(_newNode).append(split._2()); return new DefaultChildren(newChildren); } public DefaultChildren delete(int _pos) { check(_pos); P2<List<DefaultNode>,List<DefaultNode>> split = children.splitAt(_pos); List<DefaultNode> newChildren = split._1().init().append(split._2()); return new DefaultChildren(newChildren); } public void check(int _pos) { if(children.length() < _pos){ throw new IllegalArgumentException("_pos > length"); } } @Override public Iterator<Node> iterator() { return (new IterableWrapper<Node>(children)).iterator(); } }