| /******************************************************************************* |
| * Copyright (c) 2005, 2010 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 |
| * Mukul Gandhi - bug 280798 - PsychoPath support for JDK 1.4 |
| *******************************************************************************/ |
| |
| package org.eclipse.wst.xml.xpath2.processor.internal.ast; |
| |
| import org.eclipse.wst.xml.xpath2.processor.internal.*; |
| |
| /** |
| * Class for Forward stepping support for Step operations. |
| */ |
| public class ForwardStep extends Step { |
| /** |
| * Set internal value for NONE. |
| */ |
| public static final int NONE = 0; |
| /** |
| * Set internal value for CHILD. |
| */ |
| public static final int CHILD = 1; |
| /** |
| * Set internal value for DESCENDANT. |
| */ |
| public static final int DESCENDANT = 2; |
| /** |
| * Set internal value for ATTRIBUTE. |
| */ |
| public static final int ATTRIBUTE = 3; |
| /** |
| * Set internal value for SELF. |
| */ |
| public static final int SELF = 4; |
| /** |
| * Set internal value for DESCENDANT_OR_SELF. |
| */ |
| public static final int DESCENDANT_OR_SELF = 5; |
| /** |
| * Set internal value for FOLLOWING_SIBLING. |
| */ |
| public static final int FOLLOWING_SIBLING = 6; |
| /** |
| * Set internal value for FOLLOWING. |
| */ |
| public static final int FOLLOWING = 7; |
| /** |
| * Set internal value for NAMESPACE. |
| */ |
| public static final int NAMESPACE = 8; |
| /** |
| * Set internal value for AT_SYM. |
| */ |
| public static final int AT_SYM = 9; |
| |
| private int _axis; |
| |
| // XXX: we should get rid of the int axis... and make only this the axis |
| private ForwardAxis _iterator; |
| |
| // XXX: needs to be fixed |
| private void update_iterator() { |
| switch (_axis) { |
| case NONE: |
| if (node_test() instanceof AttributeTest) |
| _iterator = new AttributeAxis(); |
| else |
| _iterator = new ChildAxis(); |
| break; |
| |
| case CHILD: |
| _iterator = new ChildAxis(); |
| break; |
| |
| case DESCENDANT: |
| _iterator = new DescendantAxis(); |
| break; |
| |
| case FOLLOWING_SIBLING: |
| _iterator = new FollowingSiblingAxis(); |
| break; |
| |
| case FOLLOWING: |
| _iterator = new FollowingAxis(); |
| break; |
| |
| case AT_SYM: |
| case ATTRIBUTE: |
| _iterator = new AttributeAxis(); |
| break; |
| |
| case SELF: |
| _iterator = new SelfAxis(); |
| break; |
| |
| case DESCENDANT_OR_SELF: |
| _iterator = new DescendantOrSelfAxis(); |
| break; |
| |
| default: |
| assert false; |
| break; |
| } |
| } |
| |
| /** |
| * Constructor for ForwardStep. |
| * |
| * @param axis |
| * Axis number. |
| * @param node_test |
| * Node test. |
| */ |
| public ForwardStep(int axis, NodeTest node_test) { |
| super(node_test); |
| |
| _axis = axis; |
| |
| update_iterator(); |
| } |
| |
| /** |
| * Support for Visitor interface. |
| * |
| * @return Result of Visitor operation. |
| */ |
| public Object accept(XPathVisitor v) { |
| return v.visit(this); |
| } |
| |
| /** |
| * Support for Axis interface. |
| * |
| * @return Result of Axis operation. |
| */ |
| public int axis() { |
| return _axis; |
| } |
| |
| /** |
| * Set Axis to current. |
| * |
| * @param axis |
| * Axis to set. |
| */ |
| public void set_axis(int axis) { |
| _axis = axis; |
| update_iterator(); |
| } |
| |
| /** |
| * Support for Iterator interface. |
| * |
| * @return Result of Iterator operation. |
| */ |
| public ForwardAxis iterator() { |
| return _iterator; |
| } |
| } |