plugins/google-app-engine/source/com/intellij/appengine/facet/AppEngineFacet.java

/*
 * Copyright 2000-2014 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 com.intellij.appengine.facet;

import com.intellij.appengine.descriptor.dom.AppEngineWebApp;
import com.intellij.appengine.sdk.AppEngineSdk;
import com.intellij.appengine.sdk.AppEngineSdkManager;
import com.intellij.facet.*;
import com.intellij.openapi.module.Module;
import com.intellij.openapi.module.ModuleUtilCore;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.vfs.LocalFileSystem;
import com.intellij.openapi.vfs.VfsUtilCore;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.psi.PsiFile;
import com.intellij.psi.PsiManager;
import com.intellij.psi.xml.XmlFile;
import com.intellij.util.ReflectionUtil;
import com.intellij.util.xml.DomElement;
import com.intellij.util.xml.DomFileElement;
import com.intellij.util.xml.DomManager;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

/**
 * @author nik
 */
public class AppEngineFacet extends Facet<AppEngineFacetConfiguration> {
  public static final FacetTypeId<AppEngineFacet> ID = new FacetTypeId<AppEngineFacet>("appEngine");

  public AppEngineFacet(@NotNull FacetType facetType,
                        @NotNull Module module,
                        @NotNull String name,
                        @NotNull AppEngineFacetConfiguration configuration) {
    super(facetType, module, name, configuration, null);
  }

  public static FacetType<AppEngineFacet, AppEngineFacetConfiguration> getFacetType() {
    return FacetTypeRegistry.getInstance().findFacetType(ID);
  }

  @Nullable
  public static AppEngineFacet getAppEngineFacetByModule(@Nullable Module module) {
    if (module == null) return null;
    return FacetManager.getInstance(module).getFacetByType(ID);
  }

  @NotNull
  public AppEngineSdk getSdk() {
    return AppEngineSdkManager.getInstance().findSdk(getConfiguration().getSdkHomePath());
  }

  @Nullable
  public static AppEngineWebApp getDescriptorRoot(@Nullable VirtualFile descriptorFile, @NotNull final Project project) {
    if (descriptorFile == null) return null;

    Module module = ModuleUtilCore.findModuleForFile(descriptorFile, project);
    if (module == null) return null;

    PsiFile psiFile = PsiManager.getInstance(project).findFile(descriptorFile);
    if (psiFile == null) return null;

    return getRootElement(psiFile, AppEngineWebApp.class, module);
  }

  //todo[nik] copied from JamCommonUtil
  @Nullable
  private static <T> T getRootElement(final PsiFile file, final Class<T> domClass, final Module module) {
    if (!(file instanceof XmlFile)) return null;
    final DomManager domManager = DomManager.getDomManager(file.getProject());
    final DomFileElement<DomElement> element = domManager.getFileElement((XmlFile)file, DomElement.class);
    if (element == null) return null;
    final DomElement root = element.getRootElement();
    if (!ReflectionUtil.isAssignable(domClass, root.getClass())) return null;
    return (T)root;
  }


  public boolean shouldRunEnhancerFor(@NotNull VirtualFile file) {
    for (String path : getConfiguration().getFilesToEnhance()) {
      final VirtualFile toEnhance = LocalFileSystem.getInstance().findFileByPath(path);
      if (toEnhance != null && VfsUtilCore.isAncestor(toEnhance, file, false)) {
        return true;
      }
    }
    return false;
  }
}