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package com.c2kernel.persistency.outcome;
import java.io.IOException;
import java.io.StringReader;
import org.apache.xerces.parsers.DOMParser;
import org.apache.xerces.parsers.IntegratedParserConfiguration;
import org.apache.xerces.parsers.XMLGrammarPreparser;
import org.apache.xerces.util.SymbolTable;
import org.apache.xerces.util.XMLGrammarPoolImpl;
import org.apache.xerces.xni.XNIException;
import org.apache.xerces.xni.grammars.Grammar;
import org.apache.xerces.xni.grammars.XMLGrammarDescription;
import org.apache.xerces.xni.parser.XMLErrorHandler;
import org.apache.xerces.xni.parser.XMLInputSource;
import org.apache.xerces.xni.parser.XMLParseException;
import org.apache.xerces.xni.parser.XMLParserConfiguration;
import org.xml.sax.ErrorHandler;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import com.c2kernel.common.InvalidDataException;
import com.c2kernel.utils.Logger;
/**************************************************************************
*
* $Revision: 1.24 $
* $Date: 2005/06/09 13:50:10 $
*
* Copyright (C) 2003 CERN - European Organization for Nuclear Research
* All rights reserved.
**************************************************************************/
public class OutcomeValidator implements ErrorHandler, XMLErrorHandler {
protected static final String NAMESPACES_FEATURE_ID = "http://xml.org/sax/features/namespaces";
/** Validation feature id (http://xml.org/sax/features/validation). */
protected static final String VALIDATION_FEATURE_ID = "http://xml.org/sax/features/validation";
/** Schema validation feature id (http://apache.org/xml/features/validation/schema). */
protected static final String SCHEMA_VALIDATION_FEATURE_ID = "http://apache.org/xml/features/validation/schema";
/** Schema full checking feature id (http://apache.org/xml/features/validation/schema-full-checking). */
protected static final String SCHEMA_FULL_CHECKING_FEATURE_ID = "http://apache.org/xml/features/validation/schema-full-checking";
public static final String GRAMMAR_POOL = "http://apache.org/xml/properties/internal/grammar-pool";
static SchemaValidator schemaValid = new SchemaValidator();
Schema schema;
protected StringBuffer errors = null;
XMLGrammarPoolImpl schemaGrammarPool = new XMLGrammarPoolImpl(1);
SymbolTable sym = new SymbolTable();
public static OutcomeValidator getValidator(Schema schema) throws InvalidDataException {
String schemaId = schema.docType+"_"+schema.docVersion;
if (schemaId.equals("Schema_0"))
return schemaValid;
return new OutcomeValidator(schema);
}
protected OutcomeValidator() {
errors = new StringBuffer();
}
public OutcomeValidator(Schema schema) throws InvalidDataException {
this.schema = schema;
if (schema.docType.equals("Schema"))
throw new InvalidDataException("Use SchemaValidator to validate schema", "");
errors = new StringBuffer();
Logger.msg(5, "Parsing "+schema.docType+" version "+schema.docVersion+". "+schema.schema.length()+" chars");
XMLGrammarPreparser preparser = new XMLGrammarPreparser(sym);
preparser.registerPreparser(XMLGrammarDescription.XML_SCHEMA, null);
preparser.setProperty(GRAMMAR_POOL, schemaGrammarPool);
preparser.setFeature(NAMESPACES_FEATURE_ID, true);
preparser.setFeature(VALIDATION_FEATURE_ID, true);
preparser.setFeature(SCHEMA_VALIDATION_FEATURE_ID, true);
preparser.setFeature(SCHEMA_FULL_CHECKING_FEATURE_ID, true);
preparser.setErrorHandler(this);
try {
Grammar g = preparser.preparseGrammar(XMLGrammarDescription.XML_SCHEMA, new XMLInputSource(null, null, null, new StringReader(schema.schema), null));
} catch (IOException ex) {
throw new InvalidDataException("Error parsing schema: "+ex.getMessage(), "");
}
if (errors.length() > 0) {
throw new InvalidDataException("Schema error: \n"+errors.toString(), "");
}
}
public synchronized String validate(Outcome outcome) {
if (outcome == null) return "Outcome object was null";
Logger.msg(5, "Validating outcome no "+outcome.getID()+" as "+schema.docType+" v"+schema.docVersion);
if (outcome.getSchemaType().equals(schema.docType)
&& outcome.getSchemaVersion() == schema.docVersion) {
return validate(outcome.getData());
}
else
return "Outcome type and version did not match schema "+schema.docType;
}
public synchronized String validate(String outcome) {
if (outcome == null) return "Outcome String was null";
errors = new StringBuffer();
try {
XMLParserConfiguration parserConfiguration = new IntegratedParserConfiguration(sym, schemaGrammarPool);
parserConfiguration.setFeature(NAMESPACES_FEATURE_ID, true);
parserConfiguration.setFeature(VALIDATION_FEATURE_ID, true);
// now we can still do schema features just in case,
// so long as it's our configuraiton......
parserConfiguration.setFeature(SCHEMA_VALIDATION_FEATURE_ID, true);
parserConfiguration.setFeature(SCHEMA_FULL_CHECKING_FEATURE_ID, true);
DOMParser parser = new DOMParser(parserConfiguration);
parser.setErrorHandler(this);
parser.parse(new XMLInputSource(null, null, null, new StringReader(outcome), null));
} catch (Exception e) {
return e.getMessage();
}
return errors.toString();
}
private void appendError(String level, Exception ex) {
errors.append(level);
String message = ex.getMessage();
if (message == null || message.length()==0)
message = ex.getClass().getName();
errors.append(message);
errors.append("\n");
}
/**
* ErrorHandler for instances
*/
public void error(SAXParseException ex) throws SAXException {
appendError("ERROR: ", ex);
}
/**
*
*/
public void fatalError(SAXParseException ex) throws SAXException {
appendError("FATAL: ", ex);
}
/**
*
*/
public void warning(SAXParseException ex) throws SAXException {
appendError("WARNING: ", ex);
}
/**
* XMLErrorHandler for schema
*/
public void error(String domain, String key, XMLParseException ex)
throws XNIException {
appendError("ERROR: ", ex);
}
/**
*
*/
public void fatalError(String domain, String key, XMLParseException ex)
throws XNIException {
appendError("FATAL: ", ex);
}
/**
*
*/
public void warning(String domain, String key, XMLParseException ex)
throws XNIException {
appendError("WARNING: ", ex);
}
}
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