SpaceBrowser.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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.sun.jini.example.browser;

import com.sun.jini.example.browser.EntryTreePanel;
import com.sun.jini.outrigger.JavaSpaceAdmin;
import com.sun.jini.outrigger.AdminIterator;
import net.jini.core.entry.Entry;
import net.jini.core.entry.UnusableEntryException;
import net.jini.core.lease.Lease;
import net.jini.space.JavaSpace05;
import net.jini.space.MatchSet;
import java.awt.Toolkit;
import java.awt.Frame;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Rectangle;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.util.Collections;
import java.util.List;
import java.util.logging.Level;
import javax.swing.JFrame;
import javax.swing.JMenuBar;
import javax.swing.JMenu;
import javax.swing.JMenuItem;

/**
 * A browser utility to browse entries in a specified space.
 *
 * @author Sun Microsystems, Inc.
 *
 * @version 0.2 06/04/98
 */
class SpaceBrowser extends JFrame {
  //private SpaceEntryPanel entryPanel;
  private final static int MINIMUM_WINDOW_WIDTH = 320;
  private Browser browser;

  public SpaceBrowser(Object proxy, Browser browser) {
    super("SpaceBrowser");

    this.browser = browser;
    // init main components
    SpaceEntryPanel entryPanel = new SpaceEntryPanel(proxy);

    // add menu and attr panel
    getContentPane().setLayout(new BorderLayout());
    getContentPane().add(new BrowserMenuBar(entryPanel), "North");
    getContentPane().add(entryPanel, "Center");

    validate();
    pack();
    setSize(((getSize().width < MINIMUM_WINDOW_WIDTH) ? MINIMUM_WINDOW_WIDTH : getSize().width),
	    getSize().height);

    // center in parent frame
    Rectangle bounds = browser.getBounds();
    Dimension dialogSize = getPreferredSize();
    int xpos = bounds.x + (bounds.width - dialogSize.width)/ 2;
    int ypos = bounds.y + (bounds.height - dialogSize.height)/2;
    setLocation((xpos < 0) ? 0 : xpos,
		(ypos < 0) ? 0 : ypos);
  }


  class BrowserMenuBar extends JMenuBar {
    private EntryTreePanel entryPanel;

    public BrowserMenuBar(EntryTreePanel entryPanel) {
      this.entryPanel = entryPanel;
      JMenuItem mitem;

      // "File" Menu
      JMenu fileMenu = (JMenu) add(new JMenu("File"));
      mitem = (JMenuItem) fileMenu.add(new JMenuItem("Refresh"));
      mitem.addActionListener(browser.wrap(new ActionListener() {
	public void actionPerformed(ActionEvent ev) {
	  BrowserMenuBar.this.entryPanel.refreshPanel();
	}
      }));
      mitem = (JMenuItem) fileMenu.add(new JMenuItem("Close"));
      mitem.addActionListener(browser.wrap(new ActionListener() {
	public void actionPerformed(ActionEvent ev) {
	  SpaceBrowser.this.setVisible(false);
	}
      }));
    }
  }

  class SpaceEntryPanel extends EntryTreePanel {
    private Object proxy;

    public SpaceEntryPanel(Object proxy) {
      super(false);	// Entries are not editable.
      this.proxy = proxy;

      refreshPanel();
    }

    protected Entry[] getEntryArray() {
      try {
	List acc = new java.util.LinkedList();
	if (proxy instanceof JavaSpace05) {
	  MatchSet set =
	    ((JavaSpace05) proxy).contents(Collections.singleton(null),
					   null, Lease.ANY, Integer.MAX_VALUE);
	  Lease lease = set.getLease();
	  if (lease != null) {
	    lease = (Lease) browser.leasePreparer.prepareProxy(lease);
	    browser.leaseMgr.renewUntil(lease, Lease.ANY, null);
	  }
	  try {
	    while (true) {
	      try {
		Entry e = set.next();
		if (e == null)
		  break;
		acc.add(e);
	      } catch (UnusableEntryException e) {
		Browser.logger.log(Level.INFO, "unusable entry", e);
	      }
	    }
	  } finally {
	    if (lease != null) {
	      try {
		browser.leaseMgr.cancel(lease);
	      } catch (Exception e) {
	      }
	    }
	  }
	} else {
	  AdminIterator iter =
			   ((JavaSpaceAdmin) proxy).contents(null, null, 128);
	  try {
	    while (true) {
	      try {
		Entry e = iter.next();
		if (e == null)
		  break;
		acc.add(e);
	      } catch (UnusableEntryException e) {
		Browser.logger.log(Level.INFO, "unusable entry", e);
	      }
	    }
	  } finally {
	    try {
	      iter.close();
	    } catch (Exception e) {
	    }
	  }
	}
	return (Entry[])acc.toArray(new Entry[acc.size()]);
      } catch (Throwable t) {
	Browser.logger.log(Level.INFO, "obtaining entries failed", t);
      }

      return null;
    }
  }
}