| /******************************************************************************* |
| * Copyright (c) 2005, 2009 Andrea Bittau, University College London, and others |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Andrea Bittau - initial API and implementation from the PsychoPath XPath 2.0 |
| * Jesper Steen Moller - bug 281938 - handle missing focus |
| *******************************************************************************/ |
| |
| package org.eclipse.wst.xml.xpath2.processor.internal; |
| |
| import org.eclipse.wst.xml.xpath2.api.ResultSequence; |
| import org.eclipse.wst.xml.xpath2.processor.internal.types.AnyType; |
| |
| /** |
| * set the focus from a result sequence |
| */ |
| public class Focus { |
| private int _cp; // context position |
| private org.eclipse.wst.xml.xpath2.api.ResultSequence _rs; // all items in context |
| |
| /** |
| * Sets the _rs to rs and context position to 1. |
| * |
| * @param rs |
| * is a ResultSequence and is set to _rs. |
| */ |
| public Focus(ResultSequence rs) { |
| _rs = rs; |
| _cp = 1; |
| } |
| |
| /** |
| * Retrieves previous item from current context position. |
| * |
| * @return the item from _rs, or null if there is no context item. |
| */ |
| public AnyType context_item() { |
| // idexes start at 0 |
| if (_cp > _rs.size()) return null; |
| return (AnyType)_rs.item(_cp - 1); |
| } |
| |
| /** |
| * Checks to see if possible to advance rs. |
| * |
| * @return the boolean. |
| */ |
| public boolean advance_cp() { |
| int size; |
| |
| // check if we can advance |
| size = _rs.size(); |
| if (_cp == size) |
| return false; |
| |
| _cp++; |
| return true; |
| } |
| |
| /** |
| * returns an integer of the current position. |
| * |
| * @return the current position of rs. |
| */ |
| public int position() { |
| return _cp; |
| } |
| |
| /** |
| * returns the position of the last item in rs. |
| * |
| * @return the size of rs. |
| */ |
| public int last() { |
| return _rs.size(); |
| } |
| |
| /** |
| * sets the position. |
| * |
| * @param p |
| * is the position that is set. |
| */ |
| public void set_position(int p) { |
| _cp = p; // XXX no checks |
| } |
| } |