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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2018-2022 Saxonica Limited
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
// This Source Code Form is "Incompatible With Secondary Licenses", as defined by the Mozilla Public License, v. 2.0.
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
package net.sf.saxon.lib;
import net.sf.saxon.trans.XPathException;
import java.io.InputStream;
/**
* Interface to a class used to perform dynamic loading of classes such as
* user-hook implementations, as well as product-supplied resources like stylesheets
* and DTDs.
*/
public interface IDynamicLoader {
/**
* Set the ClassLoader to be used
* @param classLoader the ClassLoader to be used
*/
void setClassLoader(ClassLoader classLoader);
/**
* Load a class using the class name provided.
* Note that the method does not check that the object is of the right class.
* This method is intended for internal use only.
*
* @param className A string containing the name of the
* class, for example "com.microstar.sax.LarkDriver"
* @param traceOut if diagnostic tracing is required, the destination for the output; otherwise null
* @param classLoader The ClassLoader to be used to load the class. If this is null, then
* the implementation uses its own class loader.
* @return an instance of the class named, or null if it is not
* loadable.
* @throws XPathException if the class cannot be loaded.
*/
Class getClass(String className, Logger traceOut, ClassLoader classLoader) throws XPathException;
/**
* Instantiate a class using the class name provided.
* Note that the method does not check that the object is of the right class.
* This method is intended for internal use only.
*
* @param className A string containing the name of the
* class, for example "com.microstar.sax.LarkDriver"
* @param classLoader The ClassLoader to be used to load the class. If this is null, then
* the implementation uses its own class loader.
* @return an instance of the class named, or null if it is not
* loadable.
* @throws XPathException if the class cannot be loaded.
*/
Object getInstance(String className, /*@Nullable*/ ClassLoader classLoader) throws XPathException;
/**
* Instantiate a class using the class name provided, with the option of tracing
* Note that the method does not check that the object is of the right class.
* This method is intended for internal use only.
*
* @param className A string containing the name of the
* class, for example "com.microstar.sax.LarkDriver"
* @param traceOut if attempts to load classes are to be traced, then the destination
* for the trace output; otherwise null
* @param classLoader The ClassLoader to be used to load the class. If this is null, then
* the implementation uses its own choice of ClassLoader
* @return an instance of the class named, or null if it is not
* loadable.
* @throws XPathException if the class cannot be loaded.
*/
Object getInstance(String className, Logger traceOut, /*@Nullable*/ ClassLoader classLoader) throws XPathException;
/**
* Get a resource from a supplied URI using the classpath URI scheme.
* @param name the path name from the URI
* @return the content of the relevant resource
*/
InputStream getResourceAsStream(String name);
}