plugins/ByteCodeViewer/src/com/intellij/byteCodeViewer/ShowByteCodeAction.java

package com.intellij.byteCodeViewer;

import com.intellij.codeInsight.documentation.DocumentationManager;
import com.intellij.codeInsight.lookup.LookupManager;
import com.intellij.compiler.impl.TranslatingCompilerFilesMonitor;
import com.intellij.icons.AllIcons;
import com.intellij.openapi.actionSystem.*;
import com.intellij.openapi.application.ApplicationManager;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.progress.ProgressIndicator;
import com.intellij.openapi.progress.ProgressManager;
import com.intellij.openapi.progress.Task;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.roots.ProjectRootManager;
import com.intellij.openapi.ui.Messages;
import com.intellij.openapi.ui.popup.JBPopup;
import com.intellij.openapi.ui.popup.JBPopupFactory;
import com.intellij.openapi.util.Computable;
import com.intellij.openapi.util.Disposer;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.psi.*;
import com.intellij.psi.impl.source.tree.injected.InjectedLanguageUtil;
import com.intellij.psi.util.PsiUtilBase;
import com.intellij.psi.util.PsiUtilCore;
import com.intellij.ui.popup.NotLookupOrSearchCondition;
import com.intellij.ui.popup.PopupPositionManager;
import com.intellij.util.Processor;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

/**
 * User: anna
 * Date: 5/4/12
 */
public class ShowByteCodeAction extends AnAction {
  @Override
  public void update(AnActionEvent e) {
    e.getPresentation().setEnabled(false);
    e.getPresentation().setIcon(AllIcons.Toolwindows.Documentation);
    final Project project = e.getData(PlatformDataKeys.PROJECT);
    if (project != null) {
      final PsiElement psiElement = getPsiElement(e.getDataContext(), project, e.getData(PlatformDataKeys.EDITOR));
      if (psiElement != null) {
        if (psiElement.getContainingFile() instanceof PsiClassOwner &&
            ByteCodeViewerManager.getContainingClass(psiElement) != null) {
          e.getPresentation().setEnabled(true);
        }
      }
    }
  }

  @Override
  public void actionPerformed(AnActionEvent e) {
    final DataContext dataContext = e.getDataContext();
    final Project project = PlatformDataKeys.PROJECT.getData(dataContext);
    if (project == null) return;
    final Editor editor = PlatformDataKeys.EDITOR.getData(dataContext);

    final PsiElement psiElement = getPsiElement(dataContext, project, editor);
    if (psiElement == null) return;

    final String psiElementTitle = ByteCodeViewerManager.getInstance(project).getTitle(psiElement);

    final VirtualFile virtualFile = PsiUtilCore.getVirtualFile(psiElement);
    if (virtualFile == null) return;

    final SmartPsiElementPointer element = SmartPointerManager.getInstance(project).createSmartPsiElementPointer(psiElement);
    ProgressManager.getInstance().run(new Task.Backgroundable(project, "Searching byte code...") {
      private String myByteCode;
      private String myErrorMessage;
      private String myErrorTitle;

      @Override
      public void run(@NotNull ProgressIndicator indicator) {
        if (ProjectRootManager.getInstance(project).getFileIndex().isInContent(virtualFile) &&
            TranslatingCompilerFilesMonitor.getInstance().isMarkedForCompilation(project, virtualFile)) {
          myErrorMessage = "Unable to show byte code for '" + psiElementTitle + "'. Class file does not exist or is out-of-date.";
          myErrorTitle = "Class File Out-Of-Date";
        }
        else {
          myByteCode = ApplicationManager.getApplication().runReadAction(new Computable<String>() {
            @Override
            public String compute() {
              return ByteCodeViewerManager.getByteCode(psiElement);
            }
          });
        }
      }

      @Override
      public void onSuccess() {
        if (project.isDisposed()) return;

        if (myErrorMessage != null && myTitle != null) {
          Messages.showWarningDialog(project, myErrorMessage, myErrorTitle);
          return;
        }
        final PsiElement targetElement = element.getElement();
        if (targetElement == null) return;

        final ByteCodeViewerManager codeViewerManager = ByteCodeViewerManager.getInstance(project);
        if (codeViewerManager.hasActiveDockedDocWindow()) {
          codeViewerManager.doUpdateComponent(targetElement, myByteCode);
        }
        else {
          if (myByteCode == null) {
            Messages.showErrorDialog(project, "Unable to parse class file for '" + psiElementTitle + "'.", "Byte Code not Found");
            return;
          }
          final ByteCodeViewerComponent component = new ByteCodeViewerComponent(project, null);
          component.setText(myByteCode, targetElement);
          Processor<JBPopup> pinCallback = new Processor<JBPopup>() {
            @Override
            public boolean process(JBPopup popup) {
              codeViewerManager.recreateToolWindow(targetElement, targetElement);
              popup.cancel();
              return false;
            }
          };

          final JBPopup popup = JBPopupFactory.getInstance().createComponentPopupBuilder(component, null)
            .setRequestFocusCondition(project, NotLookupOrSearchCondition.INSTANCE)
            .setProject(project)
            .setDimensionServiceKey(project, DocumentationManager.JAVADOC_LOCATION_AND_SIZE, false)
            .setResizable(true)
            .setMovable(true)
            .setRequestFocus(LookupManager.getActiveLookup(editor) == null)
            .setTitle(psiElementTitle + " Bytecode")
            .setCouldPin(pinCallback)
            .createPopup();
          Disposer.register(popup, component);

          PopupPositionManager.positionPopupInBestPosition(popup, editor, dataContext);
        }
      }
    });
  }

  @Nullable
  private static PsiElement getPsiElement(DataContext dataContext, Project project, Editor editor) {
    PsiElement psiElement = null;
    if (editor == null) {
      psiElement = LangDataKeys.PSI_ELEMENT.getData(dataContext);
    } else {
      final PsiFile file = PsiUtilBase.getPsiFileInEditor(editor, project);
      final Editor injectedEditor = InjectedLanguageUtil.getEditorForInjectedLanguageNoCommit(editor, file);
      if (injectedEditor != null) {
        PsiFile psiFile = PsiUtilBase.getPsiFileInEditor(injectedEditor, project);
        psiElement = psiFile != null ? psiFile.findElementAt(injectedEditor.getCaretModel().getOffset()) : null;
      }

      if (file != null && psiElement == null) {
        psiElement = file.findElementAt(editor.getCaretModel().getOffset());
      }
    }

    return psiElement;
  }
}