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.Source; 025 import javax.xml.transform.dom.DOMResult; 026 import javax.xml.transform.dom.DOMSource; 027 import javax.xml.validation.Schema; 028 import javax.xml.validation.SchemaFactory; 029 import javax.xml.validation.Validator; 030 031 import org.xml.sax.SAXException; 032 033 import org.apache.camel.Exchange; 034 import org.apache.camel.Processor; 035 036 /** 037 * A processor which validates the XML version of the inbound message body 038 * against some schema either in XSD or RelaxNG 039 * 040 * @version $Revision: 768346 $ 041 */ 042 public class ValidatingProcessor implements Processor { 043 // for lazy creation of the Schema 044 private String schemaLanguage = XMLConstants.W3C_XML_SCHEMA_NS_URI; 045 private Schema schema; 046 private Source schemaSource; 047 private SchemaFactory schemaFactory; 048 private URL schemaUrl; 049 private File schemaFile; 050 private ValidatorErrorHandler errorHandler = new DefaultValidationErrorHandler(); 051 052 public void process(Exchange exchange) throws Exception { 053 Schema schema = getSchema(); 054 Validator validator = schema.newValidator(); 055 056 Source source = exchange.getIn().getBody(DOMSource.class); 057 if (source == null) { 058 throw new NoXmlBodyValidationException(exchange); 059 } 060 061 // create a new errorHandler and set it on the validator 062 // must be a local instance to avoid problems with concurrency (to be thread safe) 063 ValidatorErrorHandler handler = errorHandler.getClass().newInstance(); 064 validator.setErrorHandler(handler); 065 066 DOMResult result = new DOMResult(); 067 validator.validate(source, result); 068 069 handler.handleErrors(exchange, schema, result); 070 } 071 072 public void loadSchema() throws Exception { 073 // force loading of schema 074 schema = createSchema(); 075 } 076 077 // Properties 078 // ----------------------------------------------------------------------- 079 080 public Schema getSchema() throws IOException, SAXException { 081 if (schema == null) { 082 schema = createSchema(); 083 } 084 return schema; 085 } 086 087 public void setSchema(Schema schema) { 088 this.schema = schema; 089 } 090 091 public String getSchemaLanguage() { 092 return schemaLanguage; 093 } 094 095 public void setSchemaLanguage(String schemaLanguage) { 096 this.schemaLanguage = schemaLanguage; 097 } 098 099 public Source getSchemaSource() throws IOException { 100 if (schemaSource == null) { 101 schemaSource = createSchemaSource(); 102 } 103 return schemaSource; 104 } 105 106 public void setSchemaSource(Source schemaSource) { 107 this.schemaSource = schemaSource; 108 } 109 110 public URL getSchemaUrl() { 111 return schemaUrl; 112 } 113 114 public void setSchemaUrl(URL schemaUrl) { 115 this.schemaUrl = schemaUrl; 116 } 117 118 public File getSchemaFile() { 119 return schemaFile; 120 } 121 122 public void setSchemaFile(File schemaFile) { 123 this.schemaFile = schemaFile; 124 } 125 126 public SchemaFactory getSchemaFactory() { 127 if (schemaFactory == null) { 128 schemaFactory = createSchemaFactory(); 129 } 130 return schemaFactory; 131 } 132 133 public void setSchemaFactory(SchemaFactory schemaFactory) { 134 this.schemaFactory = schemaFactory; 135 } 136 137 public ValidatorErrorHandler getErrorHandler() { 138 return errorHandler; 139 } 140 141 public void setErrorHandler(ValidatorErrorHandler errorHandler) { 142 this.errorHandler = errorHandler; 143 } 144 145 // Implementation methods 146 // ----------------------------------------------------------------------- 147 148 protected SchemaFactory createSchemaFactory() { 149 return SchemaFactory.newInstance(schemaLanguage); 150 } 151 152 protected Source createSchemaSource() throws IOException { 153 throw new IllegalArgumentException("You must specify a schema, " 154 + "schemaFile, schemaSource or schemaUrl property"); 155 } 156 157 protected Schema createSchema() throws SAXException, IOException { 158 SchemaFactory factory = getSchemaFactory(); 159 160 URL url = getSchemaUrl(); 161 if (url != null) { 162 return factory.newSchema(url); 163 } 164 File file = getSchemaFile(); 165 if (file != null) { 166 return factory.newSchema(file); 167 } 168 return factory.newSchema(getSchemaSource()); 169 } 170 171 }