--- /dev/null
+/*******************************************************************************
+ * Copyright (c) 2004, 2006 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 net.sourceforge.phpdt.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");
+ }
+
+}
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