1 /*
2 * $Header: /home/cvs/jakarta-commons-sandbox/jelly/src/taglibs/beanshell/src/java/org/apache/commons/jelly/tags/beanshell/BeanShellExpressionFactory.java,v 1.1 2002/05/21 07:58:55 jstrachan Exp $
3 * $Revision: 1.1 $
4 * $Date: 2002/05/21 07:58:55 $
5 *
6 * ====================================================================
7 *
8 * The Apache Software License, Version 1.1
9 *
10 * Copyright (c) 1999-2002 The Apache Software Foundation. All rights
11 * reserved.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 *
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 *
20 * 2. Redistributions in binary form must reproduce the above copyright
21 * notice, this list of conditions and the following disclaimer in
22 * the documentation and/or other materials provided with the
23 * distribution.
24 *
25 * 3. The end-user documentation included with the redistribution, if
26 * any, must include the following acknowlegement:
27 * "This product includes software developed by the
28 * Apache Software Foundation (http://www.apache.org/)."
29 * Alternately, this acknowlegement may appear in the software itself,
30 * if and wherever such third-party acknowlegements normally appear.
31 *
32 * 4. The names "The Jakarta Project", "Commons", and "Apache Software
33 * Foundation" must not be used to endorse or promote products derived
34 * from this software without prior written permission. For written
35 * permission, please contact apache@apache.org.
36 *
37 * 5. Products derived from this software may not be called "Apache"
38 * nor may "Apache" appear in their names without prior written
39 * permission of the Apache Group.
40 *
41 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
42 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
43 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
44 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
45 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
46 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
47 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
48 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
49 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
50 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
51 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
52 * SUCH DAMAGE.
53 * ====================================================================
54 *
55 * This software consists of voluntary contributions made by many
56 * individuals on behalf of the Apache Software Foundation. For more
57 * information on the Apache Software Foundation, please see
58 * <http://www.apache.org/>.
59 *
60 * $Id: BeanShellExpressionFactory.java,v 1.1 2002/05/21 07:58:55 jstrachan Exp $
61 */
62 package org.apache.commons.jelly.tags.validate;
63
64 import org.apache.commons.jelly.JellyException;
65 import org.apache.commons.jelly.MissingAttributeException;
66 import org.apache.commons.jelly.TagSupport;
67 import org.apache.commons.jelly.XMLOutput;
68
69 import org.iso_relax.verifier.Verifier;
70 import org.iso_relax.verifier.VerifierFilter;
71 import org.iso_relax.verifier.VerifierHandler;
72
73 import org.xml.sax.ContentHandler;
74 import org.xml.sax.ErrorHandler;
75 import org.xml.sax.SAXException;
76 import org.xml.sax.SAXParseException;
77 import org.xml.sax.helpers.AttributesImpl;
78
79 /***
80 * This tag validates its body using a schema Verifier which can
81 * validate against DTDs, XML Schema, RelaxNG, Relax or TREX.
82 * Any JARV compliant Verifier could be used.
83 * The error messages are output as XML events so that they can be styled by the parent tag.
84 *
85 * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
86 * @version $Revision: 1.1 $
87 */
88 public class ValidateTag extends TagSupport {
89
90 /*** The verifier that this tag will use */
91 private Verifier verifier;
92
93 /*** The SAX ErrorHandler */
94 private ErrorHandler errorHandler;
95
96 /*** The boolean flag for whether the XML is valid */
97 private String var;
98
99 // Tag interface
100 //-------------------------------------------------------------------------
101 public void doTag(final XMLOutput output) throws Exception {
102 if ( verifier == null ) {
103 throw new MissingAttributeException("verifier");
104 }
105 boolean valid = false;
106
107 // evaluate the body using the current Verifier
108 if ( errorHandler != null ) {
109 // we are redirecting errors to another handler
110 // so just filter the body
111 VerifierFilter filter = verifier.getVerifierFilter();
112
113 // now install the current output in the filter chain...
114 // ####
115
116 ContentHandler handler = filter.getContentHandler();
117 handler.startDocument();
118 invokeBody( new XMLOutput( handler ) );
119 handler.endDocument();
120 valid = filter.isValid();
121 }
122 else {
123 // outputting the errors to the current output
124 verifier.setErrorHandler(
125 new ErrorHandler() {
126 public void error(SAXParseException exception) throws SAXException {
127 outputException(output, "error", exception);
128 }
129
130 public void fatalError(SAXParseException exception) throws SAXException {
131 outputException(output, "fatalError", exception);
132 }
133
134 public void warning(SAXParseException exception) throws SAXException {
135 outputException(output, "warning", exception);
136 }
137 }
138 );
139
140 VerifierHandler handler = verifier.getVerifierHandler();
141 handler.startDocument();
142 invokeBody( new XMLOutput( handler ) );
143 handler.endDocument();
144 valid = handler.isValid();
145 }
146 handleValid(valid);
147 }
148
149 // Properties
150 //-------------------------------------------------------------------------
151
152 /***
153 * Sets the schema Verifier that this tag will use to verify its body
154 *
155 * @jelly:required
156 */
157 public void setVerifier(Verifier verifier) {
158 this.verifier = verifier;
159 }
160
161 /***
162 * @return the ErrorHandler used when validating
163 */
164 public ErrorHandler getErrorHandler() {
165 return errorHandler;
166 }
167
168 /***
169 * Sets the SAX ErrorHandler which is used to capture
170 * XML validation events.
171 * If an ErrorHandler is specified
172 * then this tag will output its body and redirect all error messages
173 * to the ErrorHandler.
174 * If no ErrorHandler is specified then this tag will just output the
175 * error messages as XML events
176 *
177 * @jelly:optional
178 */
179 public void setErrorHandler(ErrorHandler errorHandler) {
180 this.errorHandler = errorHandler;
181 }
182
183 /***
184 * Sets the name of the variable that will contain a boolean flag for whether or
185 * not the XML is valid.
186 *
187 * @jelly:optional
188 */
189 public void setVar(String var) {
190 this.var = var;
191 }
192
193 // Implementation methods
194 //-------------------------------------------------------------------------
195
196 /***
197 * Processes whether or not the document is valid.
198 * Derived classes can overload this method to do different things, such
199 * as to throw assertion exceptions etc.
200 */
201 protected void handleValid(boolean valid) throws Exception {
202 if (var != null ) {
203 Boolean value = (valid) ? Boolean.TRUE : Boolean.FALSE;
204 context.setVariable(var, value);
205 }
206 }
207
208 /***
209 * Outputs the given validation exception as XML to the output
210 */
211 protected void outputException(XMLOutput output, String name, SAXParseException e) throws SAXException {
212 AttributesImpl attributes = new AttributesImpl();
213 String uri = "";
214 String type = "CDATA";
215 attributes.addAttribute( uri, "column", "column", type, Integer.toString( e.getColumnNumber() ) );
216 attributes.addAttribute( uri, "line", "line", type, Integer.toString( e.getLineNumber() ) );
217
218 String publicID = e.getPublicId();
219 if ( publicID != null && publicID.length() > 0 ) {
220 attributes.addAttribute( uri, "publicID", "publicID", type, publicID );
221 }
222 String systemID = e.getSystemId();
223 if ( systemID != null && systemID.length() > 0 ) {
224 attributes.addAttribute( uri, "systemID", "systemID", type, systemID );
225 }
226
227 output.startElement( uri, name, name, attributes );
228 output.write( e.getMessage() );
229 output.endElement( uri, name, name );
230 }
231
232
233 }
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