Mercurial > hg > Members > tatsuki > bench > jungle-core
view src/main/java/jp/ac/u_ryukyu/ie/cr/shoshi/jungle/store/impl/ChildrenImpl.java @ 10:a2c019a77c27
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author | Shoshi TAMAKI |
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date | Mon, 10 Dec 2012 18:50:53 +0900 |
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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; public class ChildrenImpl implements Children { private final List<Node> children; private static final List<Node> EMPTY = List.nil(); public ChildrenImpl() { this(EMPTY); } public ChildrenImpl(List<Node> _children) { children = _children; } public ChildrenImpl add(Node _newNode) { return new ChildrenImpl(children.snoc(_newNode)); } public ChildrenImpl insert(Node _newNode,int _pos) { check(_pos); P2<List<Node>,List<Node>> split = children.splitAt(_pos); List<Node> newChildren = split._1().snoc(_newNode).append(split._2()); return new ChildrenImpl(newChildren); } public ChildrenImpl delete(int _pos) { check(_pos); P2<List<Node>,List<Node>> split = children.splitAt(_pos); List<Node> newChildren = split._1().init().append(split._2()); return new ChildrenImpl(newChildren); } public void check(int _pos) { if(children.length() < _pos){ throw new IllegalArgumentException("_pos > length"); } } @Override public Iterator<Node> iterator() { return null; } }