/*
* Copyright 2001-2004 The Apache Software Foundation
*
* 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.apache.tools.ant.taskdefs.optional.jsp.compilers;
import org.apache.tools.ant.AntClassLoader;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.taskdefs.optional.jsp.JspNameMangler;
import org.apache.tools.ant.taskdefs.optional.jsp.Jasper41Mangler;
/**
* Creates the necessary compiler adapter, given basic criteria.
*
* @author <a href="mailto:jayglanville@home.com">J D Glanville</a>
* @author Matthew Watson <a href="mailto:mattw@i3sp.com">mattw@i3sp.com</a>
* @author Steve Loughran
*/
public class JspCompilerAdapterFactory {
/** This is a singleton -- can't create instances!! */
private JspCompilerAdapterFactory() {
}
/**
* Based on the parameter passed in, this method creates the necessary
* factory desired.
*
* The current mapping for compiler names are as follows:
* <ul><li>jasper = jasper compiler (the default)
* <li><i>a fully quallified classname</i> = the name of a jsp compiler
* adapter
* </ul>
*
* @param compilerType either the name of the desired compiler, or the
* full classname of the compiler's adapter.
* @param task a task to log through.
* @throws BuildException if the compiler type could not be resolved into
* a compiler adapter.
*/
public static JspCompilerAdapter getCompiler(String compilerType, Task task)
throws BuildException {
return getCompiler(compilerType, task,
task.getProject().createClassLoader(null));
}
/**
* Based on the parameter passed in, this method creates the necessary
* factory desired.
*
* The current mapping for compiler names are as follows:
* <ul><li>jasper = jasper compiler (the default)
* <li><i>a fully quallified classname</i> = the name of a jsp compiler
* adapter
* </ul>
*
* @param compilerType either the name of the desired compiler, or the
* full classname of the compiler's adapter.
* @param task a task to log through.
* @param loader AntClassLoader with which the compiler should be loaded
* @throws BuildException if the compiler type could not be resolved into
* a compiler adapter.
*/
public static JspCompilerAdapter getCompiler(String compilerType, Task task,
AntClassLoader loader)
throws BuildException {
if (compilerType.equalsIgnoreCase("jasper")) {
//tomcat4.0 gets the old mangler
return new JasperC(new JspNameMangler());
}
if (compilerType.equalsIgnoreCase("jasper41")) {
//tomcat4.1 gets the new one
return new JasperC(new Jasper41Mangler());
}
return resolveClassName(compilerType, loader);
}
/**
* Tries to resolve the given classname into a compiler adapter.
* Throws a fit if it can't.
*
* @param className The fully qualified classname to be created.
* @param classloader Classloader with which to load the class
* @throws BuildException This is the fit that is thrown if className
* isn't an instance of JspCompilerAdapter.
*/
private static JspCompilerAdapter resolveClassName(String className,
AntClassLoader classloader)
throws BuildException {
try {
Class c = classloader.findClass(className);
Object o = c.newInstance();
return (JspCompilerAdapter) o;
} catch (ClassNotFoundException cnfe) {
throw new BuildException(className + " can\'t be found.", cnfe);
} catch (ClassCastException cce) {
throw new BuildException(className + " isn\'t the classname of "
+ "a compiler adapter.", cce);
} catch (Throwable t) {
// for all other possibilities
throw new BuildException(className + " caused an interesting "
+ "exception.", t);
}
}
}