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package com.sun.xml.ws.db.sdo;
import org.eclipse.persistence.sdo.helper.DefaultSchemaResolver;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
import javax.xml.transform.Source;
import javax.xml.transform.sax.SAXSource;
import javax.xml.transform.stream.StreamSource;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.net.URL;
import java.util.List;
/**
* Created by IntelliJ IDEA.
* User: giglee
* Date: May 13, 2009
* Time: 1:15:36 PM
* To change this template use File | Settings | File Templates.
*/
public class SDODatabindingSchemaResolver extends DefaultSchemaResolver {
public static final String CLASSPATH_SCHEME = "classpath";
private List<Source> schemaList = null;
private EntityResolver externalResolver = null;
public SDODatabindingSchemaResolver(List<Source> schemas) {
schemaList = schemas;
}
public SDODatabindingSchemaResolver(List<Source> schemas, EntityResolver resolver) {
schemaList = schemas;
externalResolver = resolver;
}
public Source resolveSchema(Source sourceXSD, String namespace,
String schemaLocation) {
if (schemaLocation == null) {
return null;
}
Source source = null;
try {
URI baseURI;
if (sourceXSD != null && sourceXSD.getSystemId() != null) {
baseURI = new URI(sourceXSD.getSystemId());
String scheme = null;
if (baseURI.isOpaque()) {
scheme = baseURI.getScheme();
baseURI = new URI(baseURI.getRawSchemeSpecificPart());
}
URI schemaLocationURI = baseURI.resolve(schemaLocation);
if (scheme != null) {
schemaLocationURI = new URI(scheme + ":" + schemaLocationURI.toString());
}
source = loadSourceFromKnownSchemas(schemaList, schemaLocationURI);
if (source != null) {
return source;
}
source = loadSourceFromURL(schemaLocationURI.toURL());
if (source == null && externalResolver != null) {
InputSource inputSource = externalResolver.resolveEntity(schemaLocation, schemaLocationURI.toASCIIString());
if (inputSource != null) {
source = new SAXSource(inputSource);
}
}
} else {
System.out.println("Base URI for " + schemaLocation + " can not be determined because source schema does not have systemID set");
}
}
catch (Exception ee) {
System.out.println("Exception trying to resolve schema for "
+ schemaLocation + ": " + ee.getMessage());
}
if (source == null) {
source = loadSourceFromClasspath(schemaLocation);
}
if (source == null) {
System.out.println("Unable to resolve requested schema resource [" + schemaLocation + "]");
}
return source;
}
private Source loadSourceFromKnownSchemas(List<Source> schemas, URI schemaLocation) {
if (schemas == null) {
return null;
}
for (Source schema : schemas) {
String sysId = schema.getSystemId();
if (sysId != null && sysId.equals(schemaLocation.toASCIIString())) {
return schema;
}
}
return null;
}
private Source loadSourceFromClasspath(String schemaLocation) {
if (schemaLocation.startsWith(CLASSPATH_SCHEME)) {
schemaLocation = schemaLocation.substring(CLASSPATH_SCHEME.length() + 1);
}
URL url = Thread.currentThread().getContextClassLoader().getResource(schemaLocation);
if (url == null && schemaLocation.startsWith("/")) {
url = Thread.currentThread().getContextClassLoader().getResource(schemaLocation.substring(1));
}
if (url != null) {
return loadSourceFromURL(url);
}
return null;
}
private Source loadSourceFromURL(URL targetURL) {
Source targetXSD = null;
try {
InputStream is = targetURL.openStream();
targetXSD = new StreamSource(is);
targetXSD.setSystemId(targetURL.toExternalForm());
} catch (IOException e) {
System.out.println("failed to load source from URL:"
+ targetURL.toString() + ": " + e.getMessage());
return null;
}
return targetXSD;
}
}