org.eclipse.smila.management.jmx.client.helpers.ConfigLoader.java Source code

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Here is the source code for org.eclipse.smila.management.jmx.client.helpers.ConfigLoader.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
 **********************************************************************************************************************/
package org.eclipse.smila.management.jmx.client.helpers;

import java.io.File;
import java.io.InputStream;

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

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.eclipse.smila.management.jmx.client.Main;
import org.eclipse.smila.management.jmx.client.config.JmxClientConfigType;
import org.eclipse.smila.management.jmx.client.exceptions.ConfigurationLoadException;

/**
 * The Class ConfigLoader.
 */
public final class ConfigLoader {

    /**
     * Prevents instantiating config loader.
     */
    private ConfigLoader() {

    }

    /**
     * Load.
     * 
     * @param is
     *          the is
     * 
     * @return the cmd config type
     * 
     * @throws ConfigurationLoadException
     *           the configuration load exception
     */
    public static JmxClientConfigType load(final InputStream is) throws ConfigurationLoadException {
        try {
            final JAXBContext context = JAXBContext.newInstance("org.eclipse.smila.management.jmx.client.config");
            final SchemaFactory schemaFactory = SchemaFactory
                    .newInstance(javax.xml.XMLConstants.W3C_XML_SCHEMA_NS_URI);
            final Schema schema = schemaFactory.newSchema(new File("schemas/jmxclient.xsd"));
            final Unmarshaller unmarshaller = context.createUnmarshaller();
            unmarshaller.setSchema(schema);
            unmarshaller.setEventHandler(createValidationEventHandler());
            Object result = unmarshaller.unmarshal(is);
            if (result != null) {
                if (result instanceof JAXBElement) {
                    result = ((JAXBElement) result).getValue();
                }
            }
            return (JmxClientConfigType) result;
        } catch (final Throwable e) {
            throw new ConfigurationLoadException("Unable to load configuration", e);
        } finally {
            if (is != null) {
                try {
                    is.close();
                } catch (final Throwable e) {
                    ;// nothing
                }
            }
        }
    }

    /**
     * Creates the validation event handler.
     * 
     * @return the validation event handler
     */
    public static ValidationEventHandler createValidationEventHandler() {
        return new ValidationEventHandler() {
            public boolean handleEvent(final ValidationEvent ve) {
                final Log log = LogFactory.getLog(Main.class);
                if (ve.getSeverity() != ValidationEvent.WARNING) {
                    final ValidationEventLocator vel = ve.getLocator();
                    if (log.isErrorEnabled()) {
                        log.error("Line:Col[" + vel.getLineNumber() + ":" + vel.getColumnNumber() + "]:"
                                + ve.getMessage());
                    }
                    return false;
                }
                return true;
            }
        };
    }

}