001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the "License"); 007 * you may not use this file except in compliance with the License. 008 * You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018 /* 019 * $Id: TraceListener.java 468644 2006-10-28 06:56:42Z minchau $ 020 */ 021 package org.apache.xalan.trace; 022 023 024 /** 025 * Interface the XSL processor calls when it matches a source node, selects a set of source nodes, 026 * or generates a result node. 027 * If you want an object instance to be called when a trace event occurs, use the TransformerImpl setTraceListener method. 028 * @see org.apache.xalan.trace.TracerEvent 029 * @see org.apache.xalan.trace.TraceManager#addTraceListener 030 * @xsl.usage advanced 031 */ 032 public interface TraceListener extends java.util.EventListener 033 { 034 035 /** 036 * Method that is called when a trace event occurs. 037 * The method is blocking. It must return before processing continues. 038 * 039 * @param ev the trace event. 040 */ 041 public void trace(TracerEvent ev); 042 043 /** 044 * Method that is called just after the formatter listener is called. 045 * 046 * @param ev the generate event. 047 * 048 * @throws javax.xml.transform.TransformerException 049 */ 050 public void selected(SelectionEvent ev) throws javax.xml.transform.TransformerException; 051 052 /** 053 * Method that is called just after the formatter listener is called. 054 * 055 * @param ev the generate event. 056 */ 057 public void generated(GenerateEvent ev); 058 }