/*
* JBoss, Home of Professional Open Source
* Copyright 2013, Red Hat, Inc. and/or its affiliates, and individual
* contributors by the @authors tag. See the copyright.txt in the
* distribution for a full listing of individual contributors.
*
* Licensed 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.jboss.as.quickstart.xml;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.CharArrayReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.List;
import javax.inject.Inject;
import javax.xml.transform.Source;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.SchemaFactory;
import javax.xml.validation.Validator;
/**
* Simple class to provide base for XML file parsing. It will validate any document using the schema produced by
* {@link Constants}
*
* @author baranowb
*
*/
public abstract class XMLParser {
@Inject
private Errors errorHolder;
public List<Book> parse(InputStream is) throws Exception {
/*
* Validate against schema before it triggers implementation.
*/
StringBuffer xmlFile = new StringBuffer();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(is));
String line = null;
while ((line = bufferedReader.readLine()) != null) {
xmlFile.append(line);
}
String xml = xmlFile.toString();
// validate against schema.
try {
URL schema = Resources.getResource("/catalog.xsd");
Validator validator = SchemaFactory.newInstance("http://www.w3.org/2001/XMLSchema").newSchema(schema)
.newValidator();
Source source = new StreamSource(new CharArrayReader(xml.toCharArray()));
validator.validate(source);
} catch (Exception e) {
this.errorHolder.addErrorMessage("Validation Error", e);
return null;
}
// parse file into catalog
ByteArrayInputStream bais = new ByteArrayInputStream(xml.getBytes());
// ask extending class to parse
return parseInternal(bais);
}
/**
*
* @param is
* @return
* @throws Exception
*/
protected abstract List<Book> parseInternal(InputStream is) throws Exception;
}