TGDocumentation.java

package org.herac.tuxguitar.gui.help.doc;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;

import org.eclipse.swt.SWT;
import org.eclipse.swt.browser.Browser;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Shell;
import org.herac.tuxguitar.gui.TuxGuitar;
import org.herac.tuxguitar.gui.util.DialogUtils;
import org.herac.tuxguitar.gui.util.TGFileUtils;

public class TGDocumentation {

  private static final String RESOURCE_PATH = "help";
  private static final String TEMPORAL_PATH = System
      .getProperty("java.io.tmpdir")
      + File.separator + "tuxguitar";

  private void copyTemporalResources(String dstPath, String resourcePath,
      String[] resources) throws Throwable {
    if (resources != null) {
      for (int i = 0; i < resources.length; i++) {
        File file = new File(dstPath + File.separator + resources[i]);
        file.getParentFile().mkdirs();
        String resource = (resourcePath + "/" + resources[i]);
        String[] children = TGFileUtils.getFileNames(resource);
        if (children != null && children.length > 0) {
          copyTemporalResources(file.getAbsolutePath(), resource, children);
        } else if (!file.exists()) {
          InputStream in = TGFileUtils.getResourceAsStream(resource);
          if (in != null) {
            OutputStream out = new FileOutputStream(file);
            int len = 0;
            byte[] buf = new byte[1024];
            while ((len = in.read(buf)) > 0) {
              out.write(buf, 0, len);
            }
            out.flush();
            out.close();
            in.close();
          }
        }
      }
    }
  }

  public void display() throws Throwable {
    URL url = getIndexUrl();
    if (url != null) {
      Shell dialog = DialogUtils.newDialog(TuxGuitar.instance().getShell(),
          SWT.SHELL_TRIM);
      dialog.setLayout(new FillLayout());

      Browser browser = new Browser(dialog, SWT.BORDER);
      browser.setLayout(new FillLayout());
      browser.setUrl(url.toExternalForm());

      DialogUtils.openDialog(dialog, DialogUtils.OPEN_STYLE_CENTER
          | DialogUtils.OPEN_STYLE_MAXIMIZED);
    }
  }

  private URL getIndexUrl() throws Throwable {
    URL url = TGFileUtils.getResourceUrl(RESOURCE_PATH + "/index.html");
    if (url != null && !TGFileUtils.isLocalFile(url)) {
      String path = TEMPORAL_PATH + File.separator + RESOURCE_PATH;
      copyTemporalResources(path, RESOURCE_PATH, TGFileUtils
          .getFileNames(RESOURCE_PATH));
      url = new File(path + File.separator + "index.html").toURI().toURL();
    }
    return url;
  }
}