runtime.java

一个开源的JAVA虚拟机

/*
    libaegisvm - The Aegis Virtual Machine for executing Java bytecode
    Copyright (C) 2001-2002  Philip W. L. Fong

    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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

*/

package java.lang;

import aegis.*;
import java.io.*;

public class Runtime {
    private static Runtime theRuntime = new Runtime();
    private Runtime() { }
    public static Runtime getRuntime() {
	return theRuntime;
    }
    /**
     * \todo Not implemented yet.
     */
    public void exit(int status) {
	throw new FeatureNotYetImplementedError();
    }
    /**
     * \todo Not implemented yet.
     */
    public void addShutdownHook(Thread hook) {
	throw new FeatureNotYetImplementedError();
    }
    /**
     * \todo Not implemented yet.
     */
    public boolean removeShutdownHook(Thread hook) {
	throw new FeatureNotYetImplementedError();
    }
    /**
     * \todo Not implemented yet.
     */
    public void halt(int status) {
	throw new FeatureNotYetImplementedError();
    }
    /**
     * \todo Not implemented yet.
     */
    public Process exec(String command) throws IOException {
	throw new FeatureNotYetImplementedError();
    }
    /**
     * \todo Not implemented yet.
     */
    public Process exec(String cmd, String[] envp) throws IOException {
	throw new FeatureNotYetImplementedError();
    }
    /**
     * \todo Not implemented yet.
     */
    public Process exec(String command, String[] envp, File dir)
	throws IOException {
	throw new FeatureNotYetImplementedError();
    }
    /**
     * \todo Not implemented yet.
     */
    public Process exec(String[] cmdarray) throws IOException {
	throw new FeatureNotYetImplementedError();
    }
    /**
     * \todo Not implemented yet.
     */
    public Process exec(String[] cmdarray, String[] envp) throws IOException {
	throw new FeatureNotYetImplementedError();
    }
    /**
     * \todo Not implemented yet.
     */
    public Process exec(String[] cmdarray, String[] envp, File dir)
	throws IOException {
	throw new FeatureNotYetImplementedError();
    }
    /**
     * \todo Not implemented yet.
     */
    public long freeMemory() {
	throw new FeatureNotYetImplementedError();
    }
    /**
     * \todo Not implemented yet.
     */
    public long totalMemory() {
	throw new FeatureNotYetImplementedError();
    }
    public native void gc();
    /**
     * \todo Not implemented yet.
     */
    public void runFinalization() {
	throw new FeatureNotYetImplementedError();
    }
    public void traceInstructions(boolean on) { }
    public void traceMethodCalls(boolean on) { }
    public void load(String filename) {
	if (filename == null)
	    throw new NullPointerException();
	load(filename, System.getCaller(1));
    }
    static native void load(String filename, Class caller);
    public void loadLibrary(String libname) {
	if (libname == null)
	    throw new NullPointerException();
	loadLibrary(libname, System.getCaller(1));
    }
    static void loadLibrary(String libname, Class caller) {
	ClassLoader loader = caller.getClassLoader();
	if (loader != null) {
	    String abspath = loader.findLibrary(libname);
	    if (abspath != null) {
		load(abspath, caller);
		return;
	    }
	}
	String filename = System.mapLibraryName(libname);
	String path = System.getProperty("java.library.path");
	String pSepStr = System.getProperty("path.separator");
	String fSepStr = System.getProperty("file.separator");
	int length = path.length();
	char pSep = pSepStr.charAt(0);
	char fSep = fSepStr.charAt(0);
	for (int i = 0; i < length;) {
	    int j = path.indexOf(pSep, i);
	    String prefix = (j < 0) ? path.substring(i) : path.substring(i, j);
	    try {
		load(prefix + fSep + filename, caller);
		return;
	    } catch (UnsatisfiedLinkError err) {
	    }
	    if (j < 0)
		break;
	    i = j + 1;
	}
	throw new UnsatisfiedLinkError();
    }
}