org.eclipse.m2e.sourcelookup.ui/src/org/eclipse/m2e/sourcelookup/ui/internal/OpenPomCommandHandler.java

/*******************************************************************************
 * Copyright (c) 2011-2012 Igor Fedorenko
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *      Igor Fedorenko - initial API and implementation
 *******************************************************************************/
package org.eclipse.m2e.sourcelookup.ui.internal;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

import org.codehaus.plexus.util.IOUtil;
import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.jdt.launching.sourcelookup.advanced.AdvancedSourceLookup;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.m2e.core.ui.internal.actions.OpenPomAction;
import org.eclipse.m2e.core.ui.internal.actions.OpenPomAction.MavenStorageEditorInput;
import org.eclipse.m2e.sourcelookup.internal.launch.MetaInfMavenScanner;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.handlers.HandlerUtil;

@SuppressWarnings("restriction")
public class OpenPomCommandHandler extends AbstractHandler {

  @Override
  public Object execute(ExecutionEvent event) throws ExecutionException {
    ISelection selection = HandlerUtil.getCurrentSelectionChecked(event);

    if (!(selection instanceof IStructuredSelection) || selection.isEmpty()) {
      return null;
    }

    try {
      final File location =
          AdvancedSourceLookup.getClassesLocation(((IStructuredSelection) selection).getFirstElement());

      if (location == null) {
        return null;
      }

      final String name = location.getName();

      List<IEditorInput> inputs = new MetaInfMavenScanner<IEditorInput>() {
        @Override
        protected IEditorInput visitFile(File file) throws IOException {
          return toEditorInput(name, new FileInputStream(file));
        }

        @Override
        protected IEditorInput visitJarEntry(JarFile jar, JarEntry entry) throws IOException {
          return toEditorInput(name, jar.getInputStream(entry));
        }

      }.scan(location, "pom.xml");

      if (inputs.isEmpty()) {
        return null;
      }

      OpenPomAction.openEditor(inputs.get(0), "pom.xml");
    } catch (CoreException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }

    return null;
  }

  static MavenStorageEditorInput toEditorInput(String name, InputStream is) throws IOException {
    try {
      return new MavenStorageEditorInput(name, name, null, IOUtil.toByteArray(is));
    } finally {
      IOUtil.close(is);
    }
  }
}