Java tutorial
/** * Copyright 2011 meltmedia * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.xchain.examples.tutorial; import org.xchain.Locatable; import org.xchain.annotations.Attribute; import org.xchain.annotations.AttributeType; import org.xchain.annotations.Element; import org.xchain.impl.ChainImpl; import org.xchain.framework.sax.CommandHandler; import org.xchain.framework.sax.CommandXmlReader; import org.xchain.namespaces.sax.PipelineCommand; import org.apache.commons.jxpath.JXPathContext; import org.xml.sax.Attributes; import org.xml.sax.ContentHandler; import org.xml.sax.Locator; import org.xml.sax.SAXException; import org.xml.sax.helpers.AttributesImpl; /** * @author Christian Trimble */ public class TraceUtil { public static final String XHTML_NAMESPACE_URI = "http://www.w3.org/1999/xhtml"; public static final String DIV_ELEMENT = "div"; public static final String SPAN_ELEMENT = "span"; private static final AttributesImpl EMPTY_ATTRIBUTES = new AttributesImpl(); private static final AttributesImpl EXECUTE_DIV_ATTRIBUTES = new AttributesImpl(); private static final AttributesImpl CHILDREN_DIV_ATTRIBUTES = new AttributesImpl(); private static final AttributesImpl POST_PROCESS_DIV_ATTRIBUTES = new AttributesImpl(); private static final AttributesImpl LABEL_SPAN_ATTRIBUTES = new AttributesImpl(); private static final AttributesImpl VALUE_SPAN_ATTRIBUTES = new AttributesImpl(); static { // add the attributes to the execute div. EXECUTE_DIV_ATTRIBUTES.addAttribute("", "class", "class", "CDATA", "trace-execute"); // add the attributes to the post process div. POST_PROCESS_DIV_ATTRIBUTES.addAttribute("", "class", "class", "CDATA", "trace-post-process"); // add the attributes to the children div. CHILDREN_DIV_ATTRIBUTES.addAttribute("", "class", "class", "CDATA", "trace-children"); LABEL_SPAN_ATTRIBUTES.addAttribute("", "class", "class", "CDATA", "trace-label"); VALUE_SPAN_ATTRIBUTES.addAttribute("", "class", "class", "CDATA", "trace-value"); } public static String xhtmlPrefix(JXPathContext context) throws SAXException { String prefix = context.getPrefix(XHTML_NAMESPACE_URI); if (prefix == null) { throw new SAXException("The namespace '" + XHTML_NAMESPACE_URI + "' must be bound to a prefix."); } return prefix; } public static String createQName(String prefix, String localName) throws SAXException { if (prefix == null || "".equals(prefix)) { return localName; } return prefix + ":" + localName; } public static void startDiv(ContentHandler handler, String xhtmlPrefix, Attributes attributes) throws SAXException { handler.startElement(XHTML_NAMESPACE_URI, DIV_ELEMENT, createQName(xhtmlPrefix, DIV_ELEMENT), attributes); } public static void endDiv(ContentHandler handler, String xhtmlPrefix) throws SAXException { handler.endElement(XHTML_NAMESPACE_URI, DIV_ELEMENT, createQName(xhtmlPrefix, DIV_ELEMENT)); } public static void startSpan(ContentHandler handler, String xhtmlPrefix, Attributes attributes) throws SAXException { handler.startElement(XHTML_NAMESPACE_URI, SPAN_ELEMENT, createQName(xhtmlPrefix, SPAN_ELEMENT), attributes); } public static void endSpan(ContentHandler handler, String xhtmlPrefix) throws SAXException { handler.endElement(XHTML_NAMESPACE_URI, SPAN_ELEMENT, createQName(xhtmlPrefix, SPAN_ELEMENT)); } public static void span(ContentHandler handler, String xhtmlPrefix, Attributes attributes, String text) throws SAXException { startSpan(handler, xhtmlPrefix, attributes); characters(handler, text); endSpan(handler, xhtmlPrefix); } private static void characters(ContentHandler handler, String text) throws SAXException { char[] characters = text.toCharArray(); handler.characters(characters, 0, characters.length); } public static void startExecuteBlock(ContentHandler handler, String xhtmlPrefix, String name) throws SAXException { startDiv(handler, xhtmlPrefix, EXECUTE_DIV_ATTRIBUTES); span(handler, xhtmlPrefix, LABEL_SPAN_ATTRIBUTES, "phase:"); span(handler, xhtmlPrefix, VALUE_SPAN_ATTRIBUTES, "start execute"); span(handler, xhtmlPrefix, LABEL_SPAN_ATTRIBUTES, "name:"); span(handler, xhtmlPrefix, VALUE_SPAN_ATTRIBUTES, name); startDiv(handler, xhtmlPrefix, CHILDREN_DIV_ATTRIBUTES); } public static void endExecuteBlock(ContentHandler handler, String xhtmlPrefix, String name, boolean result) throws SAXException { endDiv(handler, xhtmlPrefix); span(handler, xhtmlPrefix, LABEL_SPAN_ATTRIBUTES, "phase:"); span(handler, xhtmlPrefix, VALUE_SPAN_ATTRIBUTES, "end execute"); span(handler, xhtmlPrefix, LABEL_SPAN_ATTRIBUTES, "name:"); span(handler, xhtmlPrefix, VALUE_SPAN_ATTRIBUTES, name); span(handler, xhtmlPrefix, LABEL_SPAN_ATTRIBUTES, "result:"); span(handler, xhtmlPrefix, VALUE_SPAN_ATTRIBUTES, "" + result); endDiv(handler, xhtmlPrefix); } public static void endExecuteBlock(ContentHandler handler, String xhtmlPrefix, String name, Exception exception) throws SAXException { endDiv(handler, xhtmlPrefix); span(handler, xhtmlPrefix, LABEL_SPAN_ATTRIBUTES, "phase:"); span(handler, xhtmlPrefix, VALUE_SPAN_ATTRIBUTES, "end execute"); span(handler, xhtmlPrefix, LABEL_SPAN_ATTRIBUTES, "name:"); span(handler, xhtmlPrefix, VALUE_SPAN_ATTRIBUTES, name); if (exception != null) { span(handler, xhtmlPrefix, LABEL_SPAN_ATTRIBUTES, "exception:"); span(handler, xhtmlPrefix, VALUE_SPAN_ATTRIBUTES, exception.toString()); } endDiv(handler, xhtmlPrefix); } public static void startPostProcessBlock(ContentHandler handler, String xhtmlPrefix, String name, Exception exception) throws SAXException { startDiv(handler, xhtmlPrefix, POST_PROCESS_DIV_ATTRIBUTES); span(handler, xhtmlPrefix, LABEL_SPAN_ATTRIBUTES, "phase:"); span(handler, xhtmlPrefix, VALUE_SPAN_ATTRIBUTES, "start post process"); span(handler, xhtmlPrefix, LABEL_SPAN_ATTRIBUTES, "name:"); span(handler, xhtmlPrefix, VALUE_SPAN_ATTRIBUTES, name); startDiv(handler, xhtmlPrefix, CHILDREN_DIV_ATTRIBUTES); } public static void endPostProcessBlock(ContentHandler handler, String xhtmlPrefix, String name, boolean result) throws SAXException { endDiv(handler, xhtmlPrefix); span(handler, xhtmlPrefix, LABEL_SPAN_ATTRIBUTES, "phase:"); span(handler, xhtmlPrefix, VALUE_SPAN_ATTRIBUTES, "end post process"); span(handler, xhtmlPrefix, LABEL_SPAN_ATTRIBUTES, "name:"); span(handler, xhtmlPrefix, VALUE_SPAN_ATTRIBUTES, name); span(handler, xhtmlPrefix, LABEL_SPAN_ATTRIBUTES, "handled:"); span(handler, xhtmlPrefix, VALUE_SPAN_ATTRIBUTES, "" + result); endDiv(handler, xhtmlPrefix); } }