/*
* Copyright 2003-2015 JetBrains s.r.o.
*
* 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 jetbrains.mps.classloading;
import jetbrains.mps.module.ReloadableModule;
import jetbrains.mps.project.facets.JavaModuleFacet;
import jetbrains.mps.project.facets.JavaModuleOperations;
import jetbrains.mps.reloading.ClassBytesProvider.ClassBytes;
import jetbrains.mps.reloading.IClassPathItem;
import org.jetbrains.annotations.NotNull;
import java.net.URL;
import java.util.Enumeration;
import java.util.List;
import java.util.function.Supplier;
public class ModuleClassLoaderSupport {
private final ReloadableModule myModule;
private final IClassPathItem myClassPathItem;
private volatile List<ClassLoader> myCompileDependencies;
private final Supplier<List<ClassLoader>> myDependenciesSupplier;
private ModuleClassLoaderSupport(@NotNull ReloadableModule module,
Supplier<List<ClassLoader>> dependencySupplier) {
this(module, dependencySupplier, calcClassPath(module));
}
private static IClassPathItem calcClassPath(@NotNull ReloadableModule module) {
JavaModuleFacet facet = module.getFacet(JavaModuleFacet.class);
//noinspection ConstantConditions
return JavaModuleOperations.createClassPathItem(facet.getClassPath(), ModuleClassLoaderSupport.class.getName());
}
ModuleClassLoaderSupport(@NotNull ReloadableModule module,
Supplier<List<ClassLoader>> dependencySupplier,
IClassPathItem classPathItem) {
myModule = module;
myDependenciesSupplier = dependencySupplier;
myClassPathItem = classPathItem;
}
/**
* @return true if MPS manages classes of this module (not IDEA plugin) and
* it is possible to create ModuleClassLoader for this module.
*
* TODO: must be just MPS_FACET
* ext point possible here
*/
public static boolean canCreate(@NotNull ReloadableModule module) {
JavaModuleFacet facet = module.getFacet(JavaModuleFacet.class);
return facet != null && facet.isCompileInMps() && module.getFacet(CustomClassLoadingFacet.class) == null;
}
public static ModuleClassLoaderSupport create(@NotNull ReloadableModule module,
Supplier<List<ClassLoader>> dependencySupplier) {
return new ModuleClassLoaderSupport(module, dependencySupplier);
}
public ReloadableModule getModule() {
return myModule;
}
public boolean canFindClass(String name) {
return myClassPathItem.hasClass(name);
}
public ClassBytes findClassBytes(String name) throws ModuleIsNotLoadableException {
return myClassPathItem.getClassBytes(name);
}
public URL findResource(String name) throws ModuleIsNotLoadableException {
return myClassPathItem.getResource(name);
}
public Enumeration<URL> findResources(String name) throws ModuleIsNotLoadableException {
return myClassPathItem.getResources(name);
}
/**
* important to have the calculation here: at the time of construction the classloaders might be not available yet
*/
List<ClassLoader> getCompileDependencies() {
if (myCompileDependencies == null) {
myCompileDependencies = myDependenciesSupplier.get();
}
return myCompileDependencies;
}
}