com.sun.tools.xjc.SchemaCache Maven / Gradle / Ivy
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package com.sun.tools.xjc;
import java.net.URL;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
import javax.xml.validation.ValidatorHandler;
import com.sun.xml.bind.v2.util.XmlFactory;
import javax.xml.XMLConstants;
import org.xml.sax.SAXException;
import static com.sun.xml.bind.v2.util.XmlFactory.allowExternalAccess;
/**
* Wraps a JAXP {@link Schema} object and lazily instantiate it.
*
* This object is thread-safe. There should be only one instance of
* this for the whole VM.
*
* @author Kohsuke Kawaguchi
*/
public final class SchemaCache {
private Schema schema;
private final URL source;
public SchemaCache(URL source) {
this.source = source;
}
public ValidatorHandler newValidator() {
synchronized(this) {
if(schema==null) {
try {
// do not disable secure processing - these are well-known schemas
SchemaFactory sf = XmlFactory.createSchemaFactory(XMLConstants.W3C_XML_SCHEMA_NS_URI, false);
schema = allowExternalAccess(sf, "file", false).newSchema(source);
} catch (SAXException e) {
// we make sure that the schema is correct before we ship.
throw new AssertionError(e);
}
}
}
ValidatorHandler handler = schema.newValidatorHandler();
return handler;
}
}