org.jbpm.configuration.JbpmTypeObjectInfo.java Source code

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Here is the source code for org.jbpm.configuration.JbpmTypeObjectInfo.java

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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2005, JBoss Inc., and individual contributors as indicated
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.jbpm.configuration;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jbpm.context.exe.Converter;
import org.jbpm.context.exe.JbpmType;
import org.jbpm.context.exe.JbpmTypeMatcher;
import org.jbpm.context.exe.VariableInstance;
import org.jbpm.db.hibernate.Converters;
import org.jbpm.util.ClassLoaderUtil;
import org.jbpm.util.XmlUtil;
import org.w3c.dom.Element;

public class JbpmTypeObjectInfo extends AbstractObjectInfo {

    private static final long serialVersionUID = 1L;

    ObjectInfo typeMatcherObjectInfo = null;
    Converter converter = null;
    Class variableInstanceClass = null;

    public JbpmTypeObjectInfo(Element jbpmTypeElement, ObjectFactoryParser objectFactoryParser) {
        super(jbpmTypeElement, objectFactoryParser);

        try {
            Element typeMatcherElement = XmlUtil.element(jbpmTypeElement, "matcher");
            if (typeMatcherElement == null) {
                throw new ConfigurationException(
                        "matcher is a required element in a jbpm-type: " + XmlUtil.toString(jbpmTypeElement));
            }
            Element typeMatcherBeanElement = XmlUtil.element(typeMatcherElement);
            typeMatcherObjectInfo = objectFactoryParser.parse(typeMatcherBeanElement);

            Element converterElement = XmlUtil.element(jbpmTypeElement, "converter");
            if (converterElement != null) {
                if (!converterElement.hasAttribute("class")) {
                    throw new ConfigurationException("class attribute is required in a converter element: "
                            + XmlUtil.toString(jbpmTypeElement));
                }
                String converterClassName = converterElement.getAttribute("class");
                converter = Converters.getConverterByClassName(converterClassName);
            }

            Element variableInstanceElement = XmlUtil.element(jbpmTypeElement, "variable-instance");
            if (!variableInstanceElement.hasAttribute("class")) {
                throw new ConfigurationException("class is a required attribute in element variable-instance: "
                        + XmlUtil.toString(jbpmTypeElement));
            }
            String variableInstanceClassName = variableInstanceElement.getAttribute("class");
            variableInstanceClass = ClassLoaderUtil.loadClass(variableInstanceClassName);
            if (!VariableInstance.class.isAssignableFrom(variableInstanceClass)) {
                throw new ConfigurationException(
                        "variable instance class '" + variableInstanceClassName + "' is not a VariableInstance");
            }
        } catch (ConfigurationException e) {
            throw e;
        } catch (Exception e) {
            // NOTE that Error's are not caught because that might halt the JVM and mask the original Error.
            // Probably the user doesn't need support for this type and doesn't have a required library in the path.
            // So let's log and ignore
            log.debug("jbpm variables type " + XmlUtil.toString(jbpmTypeElement)
                    + " couldn't be instantiated properly: " + e.toString());
            // now, let's make sure that this JbpmType is ignored by always returning false in the JbpmTypeMatcher
            typeMatcherObjectInfo = new ObjectInfo() {
                private static final long serialVersionUID = 1L;

                public boolean hasName() {
                    return false;
                }

                public String getName() {
                    return null;
                }

                public boolean isSingleton() {
                    return true;
                }

                public Object createObject(ObjectFactoryImpl objectFactory) {
                    return new JbpmTypeMatcher() {
                        private static final long serialVersionUID = 1L;

                        public boolean matches(Object value) {
                            return false;
                        }
                    };
                }
            };
            converter = null;
            variableInstanceClass = null;
        }
    }

    public Object createObject(ObjectFactoryImpl objectFactory) {
        JbpmTypeMatcher jbpmTypeMatcher = (JbpmTypeMatcher) objectFactory.createObject(typeMatcherObjectInfo);
        return new JbpmType(jbpmTypeMatcher, converter, variableInstanceClass);
    }

    private static Log log = LogFactory.getLog(JbpmTypeObjectInfo.class);
}