001: /* ====================================================================
002: * The Jcorporate Apache Style Software License, Version 1.2 05-07-2002
003: *
004: * Copyright (c) 1995-2002 Jcorporate Ltd. All rights reserved.
005: *
006: * Redistribution and use in source and binary forms, with or without
007: * modification, are permitted provided that the following conditions
008: * are met:
009: *
010: * 1. Redistributions of source code must retain the above copyright
011: * notice, this list of conditions and the following disclaimer.
012: *
013: * 2. Redistributions in binary form must reproduce the above copyright
014: * notice, this list of conditions and the following disclaimer in
015: * the documentation and/or other materials provided with the
016: * distribution.
017: *
018: * 3. The end-user documentation included with the redistribution,
019: * if any, must include the following acknowledgment:
020: * "This product includes software developed by Jcorporate Ltd.
021: * (http://www.jcorporate.com/)."
022: * Alternately, this acknowledgment may appear in the software itself,
023: * if and wherever such third-party acknowledgments normally appear.
024: *
025: * 4. "Jcorporate" and product names such as "Expresso" must
026: * not be used to endorse or promote products derived from this
027: * software without prior written permission. For written permission,
028: * please contact info@jcorporate.com.
029: *
030: * 5. Products derived from this software may not be called "Expresso",
031: * or other Jcorporate product names; nor may "Expresso" or other
032: * Jcorporate product names appear in their name, without prior
033: * written permission of Jcorporate Ltd.
034: *
035: * 6. No product derived from this software may compete in the same
036: * market space, i.e. framework, without prior written permission
037: * of Jcorporate Ltd. For written permission, please contact
038: * partners@jcorporate.com.
039: *
040: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
041: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
042: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
043: * DISCLAIMED. IN NO EVENT SHALL JCORPORATE LTD OR ITS CONTRIBUTORS
044: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
045: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
046: * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
047: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
048: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
049: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
050: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
051: * SUCH DAMAGE.
052: * ====================================================================
053: *
054: * This software consists of voluntary contributions made by many
055: * individuals on behalf of the Jcorporate Ltd. Contributions back
056: * to the project(s) are encouraged when you make modifications.
057: * Please send them to support@jcorporate.com. For more information
058: * on Jcorporate Ltd. and its products, please see
059: * <http://www.jcorporate.com/>.
060: *
061: * Portions of this software are based upon other open source
062: * products and are subject to their respective licenses.
063: */
064:
065: package com.jcorporate.expresso.kernel.management;
066:
067: import com.jcorporate.expresso.kernel.exception.ExpressoRuntimeException;
068: import com.jcorporate.expresso.kernel.util.ClassLocator;
069: import org.w3c.dom.Document;
070:
071: import javax.xml.transform.Result;
072: import javax.xml.transform.Source;
073: import javax.xml.transform.Transformer;
074: import javax.xml.transform.TransformerException;
075: import javax.xml.transform.TransformerFactory;
076: import javax.xml.transform.TransformerFactoryConfigurationError;
077: import javax.xml.transform.dom.DOMSource;
078: import javax.xml.transform.stream.StreamResult;
079: import java.io.OutputStream;
080:
081: /**
082: * DOM Writer that uses the Java TRAX API for writing the Expresso configuration
083: * file. This requires that an Java TRAX compliant XSL engine is available
084: * in the classpath. An example of this is the Xalan library from Apache.
085: *
086: * @author Michael Rimov
087: * @version $Revision: 1.7 $ on $Date: 2004/11/17 20:48:17 $
088: */
089:
090: public class TraxDOMWriter implements DOMWriter {
091:
092: public TraxDOMWriter() {
093: }
094:
095: public void saveDocument(OutputStream os, Document document)
096: throws ExpressoRuntimeException {
097: if (!isTraxInstalled()) {
098: throw new ExpressoRuntimeException(
099: "Must have javax.xml.transform.TransformerFactory in classpath. EX: Xalan");
100: }
101:
102: try {
103: TransformerFactory xformFactory = TransformerFactory
104: .newInstance();
105: Transformer idTransform = xformFactory.newTransformer();
106: Source input = new DOMSource(document);
107: Result output = new StreamResult(os);
108: idTransform.transform(input, output);
109: } catch (TransformerException ex) {
110: throw new ExpressoRuntimeException(
111: "Unable to save config file", ex);
112: } catch (TransformerFactoryConfigurationError ex) {
113: throw new ExpressoRuntimeException(
114: "Unable to save config file", ex);
115: }
116: }
117:
118: /**
119: * Retrieve a class that must exist in the classpath for this to work.
120: * Used as a sanity check to make sure the appropriate jars are installed.
121: *
122: * @return java.lang.String - the name for TransformerFactory
123: */
124: public String getRequiredClass() {
125: return "javax.xml.transform.TransformerFactory";
126: }
127:
128: /**
129: * Checks to make sure that the appropriate TransformerFactory is available
130: * before attempting to work with things.
131: *
132: * @return true if we can find the appropriate TRAX API objects
133: */
134: protected boolean isTraxInstalled() {
135: try {
136: ClassLocator.loadClass(getRequiredClass());
137: } catch (ClassNotFoundException ex) {
138: return false;
139: }
140:
141: return true;
142:
143: }
144: }
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