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/*******************************************************************************
* Copyright (c) 2012, 2014 IBM Corporation and others.
* 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.osgi.container;
import java.net.URL;
import java.util.Collection;
import java.util.List;
import org.eclipse.osgi.container.Module.StartOptions;
/**
* A module loader is what connects a {@link ModuleWiring} to a real classloader.
* @since 3.10
*/
public abstract class ModuleLoader {
/**
* Returns entries in wiring this module loader
* is associated with.
* @param path The path name in which to look.
* @param filePattern The file name pattern for selecting entries in the
* specified path
* @param options The options for listing resource names.
* @return An unmodifiable list of URL objects for each matching entry, or
* an empty list if no matching entry could be found
* @see ModuleWiring#findEntries(String, String, int)
*/
protected abstract List<URL> findEntries(String path, String filePattern, int options);
/**
*
* @param path
* @param filePattern
* @param options
* @return TODO
* @see ModuleWiring#listResources(String, String, int)
*/
protected abstract Collection<String> listResources(String path, String filePattern, int options);
/**
* Returns the class loader for this module loader. A <code>null</code>
* value will be returned if this module loader is for a fragment.
* @return The class loader for this module loader.
* @see ModuleWiring#getClassLoader()
*/
protected abstract ClassLoader getClassLoader();
/**
* Is called by {@link Module#start(Module.StartOptions...)} when
* using the {@link StartOptions#LAZY_TRIGGER} option is used.
* @return false if the trigger was not previously set; otherwise
* true is returned
*/
protected abstract boolean getAndSetTrigger();
/**
* Returns true if the lazy trigger is set for this module loader
* @return true if the lazy trigger is set for this module loader
*/
public abstract boolean isTriggerSet();
/**
* Dynamically loads fragment revisions to this already resolved
* module loader.
* @param fragments the fragments to load
*/
protected abstract void loadFragments(Collection<ModuleRevision> fragments);
}
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