/*
* Copyright 2012 The authors
* 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 com.intellij.struts2.facet.ui;
import com.intellij.openapi.module.Module;
import com.intellij.openapi.vfs.JarFileSystem;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.psi.JavaPsiFacade;
import com.intellij.psi.PsiClass;
import com.intellij.psi.PsiFile;
import com.intellij.psi.search.GlobalSearchScope;
import com.intellij.struts2.facet.Struts2LibraryType;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
/**
* Detects the Struts2 version from attached struts-2core.jar.
*
* @author Yann Cébron
*/
public class StrutsVersionDetector {
private StrutsVersionDetector() { }
@Nullable
public static String detectStrutsVersion(@NotNull final Module module) {
try {
final VirtualFile jarRoot = getStrutsJarRoot(module);
if (jarRoot == null) {
return null;
}
final VirtualFile entry = jarRoot.findFileByRelativePath("META-INF/maven/org.apache.struts/struts2-core/pom.properties");
if (entry == null) {
return null;
}
final InputStream stream = entry.getInputStream();
try {
final Properties properties = new Properties();
properties.load(stream);
return properties.getProperty("version");
}
finally {
stream.close();
}
}
catch (IOException e) {
return null;
}
}
@Nullable
private static VirtualFile getStrutsJarRoot(final Module module) throws IOException {
final GlobalSearchScope scope = GlobalSearchScope.moduleRuntimeScope(module, false);
final JavaPsiFacade psiManager = JavaPsiFacade.getInstance(module.getProject());
final VirtualFile virtualFile = getStrutsClass(scope, psiManager);
if (virtualFile == null || !(virtualFile.getFileSystem() instanceof JarFileSystem)) {
return null;
}
final VirtualFile jarFile = JarFileSystem.getInstance().getLocalVirtualFileFor(virtualFile);
if (jarFile == null) {
return null;
}
return JarFileSystem.getInstance().getJarRootForLocalFile(jarFile);
}
@Nullable
private static VirtualFile getStrutsClass(final GlobalSearchScope scope, final JavaPsiFacade psiManager) {
final PsiClass psiClass = psiManager.findClass(Struts2LibraryType.STRUTS_VERSION_CLASS, scope);
if (psiClass == null) {
return null;
}
final PsiFile psiFile = psiClass.getContainingFile();
if (psiFile == null) {
return null;
}
return psiFile.getVirtualFile();
}
}