/* * Copyright (c) 2002-2003 by OpenSymphony * All rights reserved. */package com.opensymphony.workflow;import com.opensymphony.workflow.loader.ClassLoaderUtil;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import java.util.HashMap;import java.util.Map;/** * Date: Aug 3, 2004 * Time: 11:04:43 PM * * @author hani */public class TypeResolver {    //~ Static fields/initializers /////////////////////////////////////////////    private static final Log log = LogFactory.getLog(TypeResolver.class);    private static TypeResolver resolver = new TypeResolver();    //~ Instance fields ////////////////////////////////////////////////////////    protected Map conditions = new HashMap();    protected Map functions = new HashMap();    protected Map registers = new HashMap();    protected Map validators = new HashMap();    //~ Constructors ///////////////////////////////////////////////////////////    public TypeResolver() {        validators.put("remote-ejb", "com.opensymphony.workflow.util.ejb.remote.RemoteEJBValidator");        validators.put("local-ejb", "com.opensymphony.workflow.util.ejb.local.LocalEJBValidator");        validators.put("jndi", "com.opensymphony.workflow.util.jndi.JNDIValidator");        validators.put("beanshell", "com.opensymphony.workflow.util.beanshell.BeanShellValidator");        validators.put("bsf", "com.opensymphony.workflow.util.bsf.BSFValidator");        conditions.put("remote-ejb", "com.opensymphony.workflow.util.ejb.remote.RemoteEJBCondition");        conditions.put("local-ejb", "com.opensymphony.workflow.util.ejb.local.LocalEJBCondition");        conditions.put("jndi", "com.opensymphony.workflow.util.jndi.JNDICondition");        conditions.put("beanshell", "com.opensymphony.workflow.util.beanshell.BeanShellCondition");        conditions.put("bsf", "com.opensymphony.workflow.util.bsf.BSFCondition");        registers.put("remote-ejb", "com.opensymphony.workflow.util.ejb.remote.RemoteEJBRegister");        registers.put("local-ejb", "com.opensymphony.workflow.util.ejb.local.LocalEJBRegister");        registers.put("jndi", "com.opensymphony.workflow.util.jndi.JNDIRegister");        registers.put("beanshell", "com.opensymphony.workflow.util.beanshell.BeanShellRegister");        registers.put("bsf", "com.opensymphony.workflow.util.bsf.BSFRegister");        functions.put("remote-ejb", "com.opensymphony.workflow.util.ejb.remote.RemoteEJBFunctionProvider");        functions.put("local-ejb", "com.opensymphony.workflow.util.ejb.local.LocalEJBFunctionProvider");        functions.put("jndi", "com.opensymphony.workflow.util.jndi.JNDIFunctionProvider");        functions.put("beanshell", "com.opensymphony.workflow.util.beanshell.BeanShellFunctionProvider");        functions.put("bsf", "com.opensymphony.workflow.util.bsf.BSFFunctionProvider");    }    //~ Methods ////////////////////////////////////////////////////////////////    public Condition getCondition(String type, Map args) throws WorkflowException {        String className = (String) conditions.get(type);        if (className == null) {            className = (String) args.get(Workflow.CLASS_NAME);        }        if (className == null) {            throw new WorkflowException("No type or class.name argument specified to TypeResolver");        }        return (Condition) loadObject(className);    }    public FunctionProvider getFunction(String type, Map args) throws WorkflowException {        String className = (String) functions.get(type);        if (className == null) {            className = (String) args.get(Workflow.CLASS_NAME);        }        if (className == null) {            throw new WorkflowException("No type or class.name argument specified to TypeResolver");        }        return (FunctionProvider) loadObject(className);    }    public Register getRegister(String type, Map args) throws WorkflowException {        String className = (String) registers.get(type);        if (className == null) {            className = (String) args.get(Workflow.CLASS_NAME);        }        if (className == null) {            throw new WorkflowException("No type or class.name argument specified to TypeResolver");        }        return (Register) loadObject(className);    }    public static void setResolver(TypeResolver resolver) {        TypeResolver.resolver = resolver;    }    public static TypeResolver getResolver() {        return resolver;    }    public Validator getValidator(String type, Map args) throws WorkflowException {        String className = (String) validators.get(type);        if (className == null) {            className = (String) args.get(Workflow.CLASS_NAME);        }        if (className == null) {            throw new WorkflowException("No type or class.name argument specified to TypeResolver");        }        return (Validator) loadObject(className);    }    protected Object loadObject(String clazz) {        try {            return ClassLoaderUtil.loadClass(clazz.trim(), getClass()).newInstance();        } catch (Exception e) {            log.error("Could not load class '" + clazz + "'", e);            return null;        }    }}