001 /** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 package org.apache.camel.processor.validation; 018 019 import java.io.File; 020 import java.io.IOException; 021 import java.net.URL; 022 023 import javax.xml.XMLConstants; 024 import javax.xml.transform.Result; 025 import javax.xml.transform.Source; 026 import javax.xml.transform.dom.DOMResult; 027 import javax.xml.transform.dom.DOMSource; 028 import javax.xml.transform.sax.SAXResult; 029 import javax.xml.transform.sax.SAXSource; 030 import javax.xml.validation.Schema; 031 import javax.xml.validation.SchemaFactory; 032 import javax.xml.validation.Validator; 033 034 import org.xml.sax.SAXException; 035 036 import org.apache.camel.Exchange; 037 import org.apache.camel.Processor; 038 039 /** 040 * A processor which validates the XML version of the inbound message body 041 * against some schema either in XSD or RelaxNG 042 * 043 * @version $Revision: 787958 $ 044 */ 045 public class ValidatingProcessor implements Processor { 046 // for lazy creation of the Schema 047 private String schemaLanguage = XMLConstants.W3C_XML_SCHEMA_NS_URI; 048 private Schema schema; 049 private Source schemaSource; 050 private SchemaFactory schemaFactory; 051 private URL schemaUrl; 052 private File schemaFile; 053 private ValidatorErrorHandler errorHandler = new DefaultValidationErrorHandler(); 054 private boolean useDom; 055 056 public void process(Exchange exchange) throws Exception { 057 Schema schema = getSchema(); 058 Validator validator = schema.newValidator(); 059 060 Source source; 061 Result result; 062 if (useDom) { 063 source = exchange.getIn().getBody(DOMSource.class); 064 result = new DOMResult(); 065 } else { 066 source = exchange.getIn().getBody(SAXSource.class); 067 result = new SAXResult(); 068 } 069 if (source == null) { 070 throw new NoXmlBodyValidationException(exchange); 071 } 072 073 // create a new errorHandler and set it on the validator 074 // must be a local instance to avoid problems with concurrency (to be thread safe) 075 ValidatorErrorHandler handler = errorHandler.getClass().newInstance(); 076 validator.setErrorHandler(handler); 077 078 validator.validate(source, result); 079 080 handler.handleErrors(exchange, schema, result); 081 } 082 083 public void loadSchema() throws Exception { 084 // force loading of schema 085 schema = createSchema(); 086 } 087 088 // Properties 089 // ----------------------------------------------------------------------- 090 091 public Schema getSchema() throws IOException, SAXException { 092 if (schema == null) { 093 schema = createSchema(); 094 } 095 return schema; 096 } 097 098 public void setSchema(Schema schema) { 099 this.schema = schema; 100 } 101 102 public String getSchemaLanguage() { 103 return schemaLanguage; 104 } 105 106 public void setSchemaLanguage(String schemaLanguage) { 107 this.schemaLanguage = schemaLanguage; 108 } 109 110 public Source getSchemaSource() throws IOException { 111 if (schemaSource == null) { 112 schemaSource = createSchemaSource(); 113 } 114 return schemaSource; 115 } 116 117 public void setSchemaSource(Source schemaSource) { 118 this.schemaSource = schemaSource; 119 } 120 121 public URL getSchemaUrl() { 122 return schemaUrl; 123 } 124 125 public void setSchemaUrl(URL schemaUrl) { 126 this.schemaUrl = schemaUrl; 127 } 128 129 public File getSchemaFile() { 130 return schemaFile; 131 } 132 133 public void setSchemaFile(File schemaFile) { 134 this.schemaFile = schemaFile; 135 } 136 137 public SchemaFactory getSchemaFactory() { 138 if (schemaFactory == null) { 139 schemaFactory = createSchemaFactory(); 140 } 141 return schemaFactory; 142 } 143 144 public void setSchemaFactory(SchemaFactory schemaFactory) { 145 this.schemaFactory = schemaFactory; 146 } 147 148 public ValidatorErrorHandler getErrorHandler() { 149 return errorHandler; 150 } 151 152 public void setErrorHandler(ValidatorErrorHandler errorHandler) { 153 this.errorHandler = errorHandler; 154 } 155 156 public boolean isUseDom() { 157 return useDom; 158 } 159 160 /** 161 * Sets whether DOMSource and DOMResult should be used, or 162 * SaxSource and SaxResult. 163 * 164 * @param useDom true to use DOM otherwise Sax is used 165 */ 166 public void setUseDom(boolean useDom) { 167 this.useDom = useDom; 168 } 169 170 // Implementation methods 171 // ----------------------------------------------------------------------- 172 173 protected SchemaFactory createSchemaFactory() { 174 return SchemaFactory.newInstance(schemaLanguage); 175 } 176 177 protected Source createSchemaSource() throws IOException { 178 throw new IllegalArgumentException("You must specify either a schema, schemaFile, schemaSource or schemaUrl property"); 179 } 180 181 protected Schema createSchema() throws SAXException, IOException { 182 SchemaFactory factory = getSchemaFactory(); 183 184 URL url = getSchemaUrl(); 185 if (url != null) { 186 return factory.newSchema(url); 187 } 188 File file = getSchemaFile(); 189 if (file != null) { 190 return factory.newSchema(file); 191 } 192 return factory.newSchema(getSchemaSource()); 193 } 194 195 }