org.eclipse.smila.connectivity.framework.schema.internal.JaxbPluginContext.java Source code

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Here is the source code for org.eclipse.smila.connectivity.framework.schema.internal.JaxbPluginContext.java

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/***********************************************************************************************************************
 * Copyright (c) 2008 empolis GmbH and brox IT Solutions GmbH. All rights reserved. This program and the accompanying
 * materials are made available under the terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors: Ivan Churkin (brox IT Solutions GmbH) - initial creator Sebastian Voigt (brox IT Solutions GmbH)
 **********************************************************************************************************************/
package org.eclipse.smila.connectivity.framework.schema.internal;

import static javax.xml.XMLConstants.W3C_XML_SCHEMA_NS_URI;

import javax.xml.bind.Binder;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.ValidationEvent;
import javax.xml.bind.ValidationEventHandler;
import javax.xml.bind.ValidationEventLocator;
import javax.xml.validation.SchemaFactory;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.eclipse.core.runtime.Platform;
import org.eclipse.smila.connectivity.framework.schema.ConfigurationLoader;
import org.eclipse.smila.connectivity.framework.schema.DataSourceConnectionConfigPlugin;
import org.eclipse.smila.connectivity.framework.schema.exceptions.SchemaNotFoundException;
import org.eclipse.smila.connectivity.framework.schema.exceptions.SchemaRuntimeException;

/**
 * The Class JaxbPluginContext.
 */
public class JaxbPluginContext {

    /**
     * The Constant LOG.
     */
    private final Log _log = LogFactory.getLog(JaxbPluginContext.class);

    /**
     * The _id.
     */
    private String _id;

    /**
     * The _context.
     */
    private JAXBContext _context;

    /**
     * The _plug in.
     */
    private DataSourceConnectionConfigPlugin _plugIn;

    /**
     * The _initialized.
     */
    private boolean _initialized;

    /**
     * The _binder.
     */
    private Binder _binder;

    /**
     * Gets the id.
     * 
     * @return the id
     */
    public String getId() {
        return _id;
    }

    /**
     * Sets the id.
     * 
     * @param id
     *          the new id
     */
    public void setId(final String id) {
        _id = id;
    }

    /**
     * Gets the context.
     * 
     * @return the context
     * 
     * @throws JAXBException
     *           the JAXB exception
     * @throws SchemaNotFoundException
     *           the index order schema not found exception
     */
    public JAXBContext getContext() throws SchemaNotFoundException, JAXBException {
        initilize();
        return _context;
    }

    /**
     * Initilize.
     * 
     * @throws SchemaNotFoundException
     *           the index order schema not found exception
     * @throws JAXBException
     *           the JAXB exception
     */
    public void initilize() throws SchemaNotFoundException, JAXBException {
        if (!_initialized) {
            _initialized = true;
            _plugIn = ConfigurationLoader.getPlugin(_id);
            if (_plugIn == null) {
                throw new SchemaNotFoundException(_id);
            }
            _context = ConfigurationLoader.newContext(_id);
            if (_context == null) {
                throw new SchemaNotFoundException(_id);
            }
            _binder = _context.createBinder();
        }
    }

    /**
     * Load class.
     * 
     * @param className
     *          the clazz
     * 
     * @return the class
     * 
     * @throws ClassNotFoundException
     *           the class not found exception
     */
    private Class loadClassByName(final String className) throws ClassNotFoundException {
        return _plugIn.getClass().getClassLoader().loadClass(_plugIn.getMessagesPackage() + "." + className);
    }

    /**
     * Unmarshall.
     * 
     * @param v
     *          the v
     * @param className
     *          the clazz
     * 
     * @return the jAXB element
     * 
     * @throws JAXBException
     *           the JAXB exception
     * @throws ClassNotFoundException
     *           the class not found exception
     * @throws SchemaNotFoundException
     *           the index order schema not found exception
     */
    @SuppressWarnings("unchecked")
    public JAXBElement unmarshall(final Object v, final String className)
            throws JAXBException, ClassNotFoundException, SchemaNotFoundException {
        initilize();
        assertNotNull(_binder);
        return _binder.unmarshal(v, loadClassByName(className));
    }

    /**
     * Creates the validating unmarshaller.
     * 
     * @return the unmarshaller
     * 
     * @throws JAXBException
     *           the JAXB exception
     * @throws SchemaNotFoundException
     *           the index order schema not found exception
     */
    public Unmarshaller createValidatingUnmarshaller() throws JAXBException, SchemaNotFoundException {
        initilize();
        assertNotNull(_context);
        final Unmarshaller unmarshaller = _context.createUnmarshaller();
        final SchemaFactory sf = SchemaFactory.newInstance(W3C_XML_SCHEMA_NS_URI);
        try {
            sf.setResourceResolver(new XSDContextURIResolver(sf.getResourceResolver()));
            final javax.xml.validation.Schema schema = sf
                    .newSchema(Platform.getBundle(_id).getEntry(_plugIn.getSchemaLocation()));
            unmarshaller.setSchema(schema);
            unmarshaller.setEventHandler(new ValidationEventHandler() {
                public boolean handleEvent(final ValidationEvent ve) {
                    if (ve.getSeverity() != ValidationEvent.WARNING) {
                        final ValidationEventLocator vel = ve.getLocator();
                        _log.error("Line:Col[" + vel.getLineNumber() + ":" + vel.getColumnNumber() + "]:"
                                + ve.getMessage());
                        return false;
                    }
                    return true;
                }
            });
        } catch (final org.xml.sax.SAXException se) {
            throw new SchemaRuntimeException("Unable to validate due to following error.", se);
        }
        return unmarshaller;
    }

    /**
     * Assert not null.
     * 
     * @param o
     *          the o
     * 
     * @throws SchemaNotFoundException
     *           the index order schema not found exception
     */
    private void assertNotNull(final Object o) throws SchemaNotFoundException {
        if (o == null) {
            throw new SchemaNotFoundException(_id);
        }
    }

}