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The Core Camel Java DSL based router
/**
* 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.processor.validation;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import javax.xml.XMLConstants;
import javax.xml.transform.Source;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
import org.w3c.dom.ls.LSResourceResolver;
import org.xml.sax.SAXException;
import org.apache.camel.CamelContext;
import org.apache.camel.converter.IOConverter;
import org.apache.camel.util.IOHelper;
import org.apache.camel.util.ObjectHelper;
import org.apache.camel.util.ResourceHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Reads the schema used in the processor {@link ValidatingProcessor}.
* A schema re-reading could be forced using {@link org.apache.camel.component.validator.ValidatorEndpoint#clearCachedSchema()}.
*/
public class SchemaReader {
/** Key of the global option to switch either off or on the access to external DTDs in the XML Validator for StreamSources.
* Only effective, if not a custom schema factory is used.*/
public static final String ACCESS_EXTERNAL_DTD = "CamelXmlValidatorAccessExternalDTD";
private static final Logger LOG = LoggerFactory.getLogger(SchemaReader.class);
private String schemaLanguage = XMLConstants.W3C_XML_SCHEMA_NS_URI;
// must be volatile because is accessed from different threads see ValidatorEndpoint.clearCachedSchema
private volatile Schema schema;
private Source schemaSource;
// must be volatile because is accessed from different threads see ValidatorEndpoint.clearCachedSchema
private volatile SchemaFactory schemaFactory;
private URL schemaUrl;
private File schemaFile;
private byte[] schemaAsByteArray;
private final String schemaResourceUri;
private LSResourceResolver resourceResolver;
private final CamelContext camelContext;
public SchemaReader() {
this.camelContext = null;
this.schemaResourceUri = null;
}
/** Specify a camel context and a schema resource URI in order to read the schema via the class resolver specified in the Camel context. */
public SchemaReader(CamelContext camelContext, String schemaResourceUri) {
ObjectHelper.notNull(camelContext, "camelContext");
ObjectHelper.notNull(schemaResourceUri, "schemaResourceUri");
this.camelContext = camelContext;
this.schemaResourceUri = schemaResourceUri;
}
public void loadSchema() throws Exception {
// force loading of schema
schema = createSchema();
}
// Properties
// -----------------------------------------------------------------------
public Schema getSchema() throws IOException, SAXException {
if (schema == null) {
synchronized (this) {
if (schema == null) {
schema = createSchema();
}
}
}
return schema;
}
public void setSchema(Schema schema) {
this.schema = schema;
}
public String getSchemaLanguage() {
return schemaLanguage;
}
public void setSchemaLanguage(String schemaLanguage) {
this.schemaLanguage = schemaLanguage;
}
public Source getSchemaSource() throws IOException {
if (schemaSource == null) {
schemaSource = createSchemaSource();
}
return schemaSource;
}
public void setSchemaSource(Source schemaSource) {
this.schemaSource = schemaSource;
}
public URL getSchemaUrl() {
return schemaUrl;
}
public void setSchemaUrl(URL schemaUrl) {
this.schemaUrl = schemaUrl;
}
public File getSchemaFile() {
return schemaFile;
}
public void setSchemaFile(File schemaFile) {
this.schemaFile = schemaFile;
}
public byte[] getSchemaAsByteArray() {
return schemaAsByteArray;
}
public void setSchemaAsByteArray(byte[] schemaAsByteArray) {
this.schemaAsByteArray = schemaAsByteArray;
}
public SchemaFactory getSchemaFactory() {
if (schemaFactory == null) {
synchronized (this) {
if (schemaFactory == null) {
schemaFactory = createSchemaFactory();
}
}
}
return schemaFactory;
}
public void setSchemaFactory(SchemaFactory schemaFactory) {
this.schemaFactory = schemaFactory;
}
public LSResourceResolver getResourceResolver() {
return resourceResolver;
}
public void setResourceResolver(LSResourceResolver resourceResolver) {
this.resourceResolver = resourceResolver;
}
protected SchemaFactory createSchemaFactory() {
SchemaFactory factory = SchemaFactory.newInstance(schemaLanguage);
if (getResourceResolver() != null) {
factory.setResourceResolver(getResourceResolver());
}
if (camelContext == null || !Boolean.parseBoolean(camelContext.getProperty(ACCESS_EXTERNAL_DTD))) {
try {
factory.setProperty(XMLConstants.ACCESS_EXTERNAL_DTD, "");
} catch (SAXException e) {
LOG.warn(e.getMessage(), e);
}
}
return factory;
}
protected Source createSchemaSource() throws IOException {
throw new IllegalArgumentException("You must specify either a schema, schemaFile, schemaSource, schemaUrl, or schemaUri property");
}
protected Schema createSchema() throws SAXException, IOException {
SchemaFactory factory = getSchemaFactory();
URL url = getSchemaUrl();
if (url != null) {
synchronized (this) {
return factory.newSchema(url);
}
}
File file = getSchemaFile();
if (file != null) {
synchronized (this) {
return factory.newSchema(file);
}
}
byte[] bytes = getSchemaAsByteArray();
if (bytes != null) {
synchronized (this) {
return factory.newSchema(new StreamSource(new ByteArrayInputStream(schemaAsByteArray)));
}
}
if (schemaResourceUri != null) {
synchronized (this) {
bytes = readSchemaResource();
return factory.newSchema(new StreamSource(new ByteArrayInputStream(bytes)));
}
}
Source source = getSchemaSource();
synchronized (this) {
return factory.newSchema(source);
}
}
protected byte[] readSchemaResource() throws IOException {
LOG.debug("reading schema resource: {}", schemaResourceUri);
InputStream is = ResourceHelper.resolveMandatoryResourceAsInputStream(camelContext, schemaResourceUri);
byte[] bytes = null;
try {
bytes = IOConverter.toBytes(is);
} finally {
// and make sure to close the input stream after the schema has been
// loaded
IOHelper.close(is);
}
return bytes;
}
}