| /******************************************************************************* |
| * Copyright (c) 2004, 2009 IBM Corporation 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: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jdt.core.dom; |
| |
| /** |
| * A node event handler is an internal mechanism for receiving |
| * notification of changes to nodes in an AST. |
| * <p> |
| * The default implementation serves as the default event handler |
| * that does nothing. Internal subclasses do all the real work. |
| * </p> |
| * |
| * @see AST#getEventHandler() |
| */ |
| class NodeEventHandler { |
| |
| /** |
| * Creates a node event handler. |
| */ |
| NodeEventHandler() { |
| // default implementation: do nothing |
| } |
| |
| /** |
| * Reports that the given node is about to lose a child. |
| * The first half of an event pair. The default implementation does nothing. |
| * |
| * @param node the node about to be modified |
| * @param child the node about to be removed |
| * @param property the child or child list property descriptor |
| * @see #postRemoveChildEvent(ASTNode, ASTNode, StructuralPropertyDescriptor) |
| * @since 3.0 |
| */ |
| void preRemoveChildEvent(ASTNode node, ASTNode child, StructuralPropertyDescriptor property) { |
| // do nothing |
| // System.out.println("DEL1 " + property); |
| } |
| |
| /** |
| * Reports that the given node has just lose a child. |
| * The second half of an event pair. The default implementation does nothing. |
| * |
| * @param node the node that was modified |
| * @param child the child that was removed; note that this node is unparented |
| * @param property the child or child list property descriptor |
| * @see #preRemoveChildEvent(ASTNode, ASTNode, StructuralPropertyDescriptor) |
| * @since 3.0 |
| */ |
| void postRemoveChildEvent(ASTNode node, ASTNode child, StructuralPropertyDescriptor property) { |
| // do nothing |
| // System.out.println("DEL2 " + property); |
| } |
| |
| /** |
| * Reports that the given node is about to have a child replaced. |
| * The first half of an event pair. |
| * The default implementation does nothing. |
| * |
| * @param node the node about to be modified |
| * @param child the node about to be replaced |
| * @param newChild the replacement child; note that this node is unparented |
| * @param property the child or child list property descriptor |
| * @see #preReplaceChildEvent(ASTNode, ASTNode, ASTNode, StructuralPropertyDescriptor) |
| * @since 3.0 |
| */ |
| void preReplaceChildEvent(ASTNode node, ASTNode child, ASTNode newChild, StructuralPropertyDescriptor property) { |
| // do nothing |
| // System.out.println("REP1 " + property); |
| } |
| |
| /** |
| * Reports that the given node has had its child replaced. The second half |
| * of an event pair. The default implementation does nothing. |
| * |
| * @param node the node that was modified |
| * @param child the node that was replaced; note that this node is unparented |
| * @param newChild the replacement child |
| * @param property the child or child list property descriptor |
| * @see #postReplaceChildEvent(ASTNode, ASTNode, ASTNode, StructuralPropertyDescriptor) |
| * @since 3.0 |
| */ |
| void postReplaceChildEvent(ASTNode node, ASTNode child, ASTNode newChild, StructuralPropertyDescriptor property) { |
| // do nothing |
| // System.out.println("REP2 " + property); |
| } |
| |
| /** |
| * Reports that the given node is about to gain a child. |
| * The first half of an event pair. The default implementation does nothing. |
| * |
| * @param node the node that to be modified |
| * @param child the node that is to be added as a child; note that this |
| * node is unparented; in the case of a child list property, the exact |
| * location of insertion is not supplied (but is known on the |
| * corresponding <code>postAddChildEvent</code> to |
| * follow) |
| * @param property the child or child list property descriptor |
| * @see #postAddChildEvent(ASTNode, ASTNode, StructuralPropertyDescriptor) |
| * @since 3.0 |
| */ |
| void preAddChildEvent(ASTNode node, ASTNode child, StructuralPropertyDescriptor property) { |
| // do nothing |
| // System.out.println("ADD1 " + property); |
| } |
| |
| /** |
| * Reports that the given node has just gained a child. |
| * The second half of an event pair. The default implementation does nothing. |
| * |
| * @param node the node that was modified |
| * @param child the node that was added as a child |
| * @param property the child or child list property descriptor |
| * @see #preAddChildEvent(ASTNode, ASTNode, StructuralPropertyDescriptor) |
| * @since 3.0 |
| */ |
| void postAddChildEvent(ASTNode node, ASTNode child, StructuralPropertyDescriptor property) { |
| // do nothing |
| // System.out.println("ADD2 " + property); |
| } |
| |
| /** |
| * Reports that the given node is about to change the value of a |
| * non-child property. The first half of an event pair. |
| * The default implementation does nothing. |
| * |
| * @param node the node to be modified |
| * @param property the property descriptor |
| * @see #postValueChangeEvent(ASTNode, SimplePropertyDescriptor) |
| * @since 3.0 |
| */ |
| void preValueChangeEvent(ASTNode node, SimplePropertyDescriptor property) { |
| // do nothing |
| // System.out.println("MOD1 " + property); |
| } |
| |
| /** |
| * Reports that the given node has just changed the value of a |
| * non-child property. The second half of an event pair. |
| * The default implementation does nothing. |
| * |
| * @param node the node that was modified |
| * @param property the property descriptor |
| * @see #preValueChangeEvent(ASTNode, SimplePropertyDescriptor) |
| * @since 3.0 |
| */ |
| void postValueChangeEvent(ASTNode node, SimplePropertyDescriptor property) { |
| // do nothing |
| // System.out.println("MOD2 " + property); |
| } |
| |
| /** |
| * Reports that the given node is about to be cloned. |
| * The first half of an event pair. |
| * The default implementation does nothing. |
| * |
| * @param node the node to be modified |
| * @see #postCloneNodeEvent(ASTNode, ASTNode) |
| * @since 3.0 |
| */ |
| void preCloneNodeEvent(ASTNode node) { |
| // do nothing |
| // System.out.println("CLONE1"); |
| } |
| |
| /** |
| * Reports that the given node has just been cloned. |
| * The second half of an event pair. |
| * The default implementation does nothing. |
| * |
| * @param node the node that was modified |
| * @param clone the clone of <code>node</code> |
| * @see #preCloneNodeEvent(ASTNode) |
| * @since 3.0 |
| */ |
| void postCloneNodeEvent(ASTNode node, ASTNode clone) { |
| // do nothing |
| // System.out.println("CLONE2"); |
| } |
| |
| } |