| /******************************************************************************* |
| * 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 |
| *******************************************************************************/ |
| |
| package org.eclipse.wst.xml.xpath2.processor.internal; |
| |
| import java.util.*; |
| |
| import org.eclipse.wst.xml.xpath2.processor.ResultSequence; |
| import org.eclipse.wst.xml.xpath2.processor.internal.types.*; |
| |
| /** |
| * Default implementation of a result sequence. |
| * |
| */ |
| public class DefaultResultSequence extends ResultSequence { |
| |
| private List _seq; |
| |
| /** |
| * Constructor. |
| * |
| * an empty array is created |
| */ |
| public DefaultResultSequence() { |
| _seq = new ArrayList(); |
| } |
| |
| /** |
| * @param item |
| * is added |
| */ |
| public DefaultResultSequence(AnyType item) { |
| this(); |
| add(item); |
| } |
| |
| /** |
| * @param item |
| * is added to array _seq |
| */ |
| @Override |
| public void add(AnyType item) { |
| assert item != null; |
| _seq.add(item); |
| } |
| |
| /** |
| * @param rs |
| * ResultSequence |
| */ |
| @Override |
| public void concat(ResultSequence rs) { |
| for (Iterator i = rs.iterator(); i.hasNext();) |
| _seq.add(i.next()); |
| } |
| |
| /** |
| * @return the next iteration of array _seq |
| */ |
| @Override |
| public ListIterator iterator() { |
| return _seq.listIterator(); |
| } |
| |
| /** |
| * @return integer of the size of array _seq |
| */ |
| @Override |
| public int size() { |
| return _seq.size(); |
| } |
| |
| /** |
| * @param i |
| * is the position of the array item that is wanted. |
| * @return item i from array _seq |
| */ |
| @Override |
| public AnyType get(int i) { |
| return (AnyType) _seq.get(i); |
| } |
| |
| /** |
| * @return first item from array _seq |
| */ |
| @Override |
| public AnyType first() { |
| if (_seq.size() == 0) |
| return null; |
| |
| return get(0); |
| } |
| |
| /** |
| * Whether or not array _seq is empty |
| * |
| * @return a boolean |
| */ |
| @Override |
| public boolean empty() { |
| return _seq.isEmpty(); |
| } |
| |
| /** |
| * Clears the sequence. |
| */ |
| @Override |
| public void clear() { |
| _seq.clear(); |
| } |
| |
| /** |
| * Create a new sequence. |
| * |
| * @return The new sequence. |
| */ |
| @Override |
| public ResultSequence create_new() { |
| return new DefaultResultSequence(); |
| } |
| } |