jacobobject.java

Very Nice library for using ActiveX controls directly from java without heavy knowledge of JNI, simp

/*
 * Copyright (c) 1999-2004 Sourceforge JACOB Project.
 * All rights reserved. Originator: Dan Adler (http://danadler.com).
 * Get more information about JACOB at http://sourceforge.net/projects/jacob-project
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
package com.jacob.com;


/**
 * The superclass of all Jacob objects. It is used to create a standard API
 * framework and to facilitate memory management for Java and COM memory
 * elements.
 * <p>
 * All instances of this class and subclasses are automatically managed by the
 * ROT. This means the ROT cannot be a subclass of JacobObject.
 * <p>
 * All COM object created by JACOB extend this class so that we can
 * automatically release them when the thread is detached from COM - if we leave
 * it to the finalizer it will call the release from another thread, which may
 * result in a segmentation violation.
 */
public class JacobObject {

	/**
	 * Standard constructor that adds this JacobObject to the memory management
	 * pool.
	 */
	public JacobObject() {
		ROT.addObject(this);
	}

	/**
	 * Finalizers call this method. This method should release any COM data
	 * structures in a way that it can be called multiple times. This can happen
	 * if someone manually calls this and then a finalizer calls it.
	 */
	public void safeRelease() {
		// currently does nothing - subclasses may do something
		if (isDebugEnabled()) {
			// this used to do a toString() but that is bad for SafeArray
			debug("SafeRelease: " + this.getClass().getName());
		}
	}

	/**
	 * When things go wrong, it is useful to be able to debug the ROT.
	 */
	private static final boolean DEBUG =
	// true;
	"true".equalsIgnoreCase(System.getProperty("com.jacob.debug"));

	protected static boolean isDebugEnabled() {
		// return true;
		return DEBUG;
	}

	/**
	 * Loads version.properties and returns the value of version in it
	 * @deprecated use JacobReleaseInfo.getBuildDate() instead.
	 * @return String value of version in version.properties or "" if none
	 */
	@Deprecated
	public static String getBuildDate() {
		return JacobReleaseInfo.getBuildDate();
	}

	/**
	 * Loads version.properties and returns the value of version in it
	 * @deprecated use JacobReleaseInfo.getBuildVersion() instead.
	 * @return String value of version in version.properties or "" if none
	 */
	@Deprecated
	public static String getBuildVersion() {
		return JacobReleaseInfo.getBuildVersion();
	}

	/**
	 * Very basic debugging fucntion.
	 * 
	 * @param istrMessage
	 */
	protected static void debug(String istrMessage) {
		if (isDebugEnabled()) {
			System.out.println(istrMessage + " in thread "
					+ Thread.currentThread().getName());
		}
	}

	/**
	 * force the jacob DLL to be loaded whenever this class is referenced
	 */
	static {
		LibraryLoader.loadJacobLibrary();
	}

}