Mercurial > hg > Members > tatsuki > bench > jungle-core
view src/main/java/jp/ac/u_ryukyu/ie/cr/shoshi/jungle/store/impl/DefaultChildren.java @ 23:3ef2a66a8c5d
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author | Shoshi TAMAKI |
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date | Thu, 10 Jan 2013 23:22:42 +0900 |
parents | 9fd57b7c6adb |
children | ec033569ab8f |
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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.Either; 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.store.trasnformer.EditableChildren; import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.trasnformer.EditableNode; import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.util.IterableWrapper; public class DefaultChildren implements EditableChildren { 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 Either<Error,DefaultChildren> insert(DefaultNode _newNode,int _pos) { if(!check(_pos)){ return Either.left(Error.INVALID_POSITION); } P2<List<DefaultNode>,List<DefaultNode>> split = children.splitAt(_pos); List<DefaultNode> newChildren = split._1().snoc(_newNode).append(split._2()); return Either.right(new DefaultChildren(newChildren)); } public Either<Error,DefaultChildren> delete(int _pos) { if(!check(_pos)){ return Either.left(Error.INVALID_POSITION); } P2<List<DefaultNode>,List<DefaultNode>> split = children.splitAt(_pos); List<DefaultNode> newChildren = split._1().init().append(split._2()); return Either.right(new DefaultChildren(newChildren)); } public boolean check(int _pos) { if(children.length() < _pos){ return false; } return true; } @Override public Iterator<Node> iterator() { return (new IterableWrapper<Node>(children)).iterator(); } @Override public Either<Error,EditableNode> addNewChildAt(int _pos) { return null; } @Override public EditableNode deleteChildAt(int _pos) { return null; } }