Java tutorial
/** * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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.apache.camel.component.validator.jing; import java.io.IOException; import java.io.InputStream; import javax.xml.XMLConstants; import javax.xml.transform.Source; import javax.xml.transform.sax.SAXSource; import org.xml.sax.InputSource; import org.xml.sax.SAXException; import org.xml.sax.XMLReader; import com.thaiopensource.relaxng.SchemaFactory; import com.thaiopensource.util.PropertyMap; import com.thaiopensource.util.PropertyMapBuilder; import com.thaiopensource.validate.IncorrectSchemaException; import com.thaiopensource.validate.Schema; import com.thaiopensource.validate.ValidateProperty; import com.thaiopensource.validate.Validator; import com.thaiopensource.xml.sax.Jaxp11XMLReaderCreator; import org.apache.camel.Exchange; import org.apache.camel.Message; import org.apache.camel.Processor; import org.apache.camel.processor.validation.DefaultValidationErrorHandler; import org.apache.camel.util.ExchangeHelper; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.springframework.core.io.Resource; /** * A validator which uses the <a * href="http://www.thaiopensource.com/relaxng/jing.html">Jing</a> library to * validate XML against RelaxNG * * @version $Revision$ */ public class JingValidator implements Processor { //private static final transient Log LOG = LogFactory.getLog(JingValidator.class); private Schema schema; private SchemaFactory schemaFactory; private String schemaNamespace = XMLConstants.RELAXNG_NS_URI; private Resource schemaResource; private InputSource inputSource; private boolean compactSyntax; public void process(Exchange exchange) throws Exception { Jaxp11XMLReaderCreator xmlCreator = new Jaxp11XMLReaderCreator(); DefaultValidationErrorHandler errorHandler = new DefaultValidationErrorHandler(); PropertyMapBuilder mapBuilder = new PropertyMapBuilder(); mapBuilder.put(ValidateProperty.XML_READER_CREATOR, xmlCreator); mapBuilder.put(ValidateProperty.ERROR_HANDLER, errorHandler); PropertyMap propertyMap = mapBuilder.toPropertyMap(); Validator validator = getSchema().createValidator(propertyMap); Message in = exchange.getIn(); SAXSource saxSource = in.getBody(SAXSource.class); if (saxSource == null) { Source source = ExchangeHelper.getMandatoryInBody(exchange, Source.class); saxSource = ExchangeHelper.convertToMandatoryType(exchange, SAXSource.class, source); } InputSource bodyInput = saxSource.getInputSource(); // now lets parse the body using the validator XMLReader reader = xmlCreator.createXMLReader(); reader.setContentHandler(validator.getContentHandler()); reader.setDTDHandler(validator.getDTDHandler()); reader.setErrorHandler(errorHandler); reader.parse(bodyInput); errorHandler.handleErrors(exchange, schema); } // Properties // ------------------------------------------------------------------------- public Schema getSchema() throws IOException, IncorrectSchemaException, SAXException { if (schema == null) { SchemaFactory factory = getSchemaFactory(); schema = factory.createSchema(getInputSource()); } return schema; } public void setSchema(Schema schema) { this.schema = schema; } public InputSource getInputSource() throws IOException { if (inputSource == null) { Resource resource = getSchemaResource(); if (resource == null) { throw new IllegalArgumentException("No schemaResource or inputSource specified"); } else { InputStream inputStream = resource.getInputStream(); if (inputStream == null) { throw new IllegalArgumentException("No inputStream available for: " + resource); } inputSource = new InputSource(inputStream); } } return inputSource; } public void setInputSource(InputSource inputSource) { this.inputSource = inputSource; } public SchemaFactory getSchemaFactory() { if (schemaFactory == null) { schemaFactory = new SchemaFactory(); schemaFactory.setCompactSyntax(compactSyntax); schemaFactory.setXMLReaderCreator(new Jaxp11XMLReaderCreator()); } return schemaFactory; } public void setSchemaFactory(SchemaFactory schemaFactory) { this.schemaFactory = schemaFactory; } public Resource getSchemaResource() { return schemaResource; } public void setSchemaResource(Resource schemaResource) { this.schemaResource = schemaResource; } public String getSchemaNamespace() { return schemaNamespace; } public void setSchemaNamespace(String schemaNamespace) { this.schemaNamespace = schemaNamespace; } public boolean isCompactSyntax() { return compactSyntax; } public void setCompactSyntax(boolean compactSyntax) { this.compactSyntax = compactSyntax; } }