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/*
 * Copyright 2016 Carlos Ballesteros Velasco
 *
 * Licensed 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 java.lang;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.StringTokenizer;

public class Runtime {
    private static Runtime currentRuntime = new Runtime();

    public static Runtime getRuntime() {
        return currentRuntime;
    }

    private Runtime() {
    }

    native public void exit(int status);

    native public void addShutdownHook(Thread hook);

    native public boolean removeShutdownHook(Thread hook);

    native public void halt(int status);

    @Deprecated
    native public static void runFinalizersOnExit(boolean value);

    public Process exec(String command) throws IOException {
        return exec(command, null, null);
    }

    public Process exec(String command, String[] envp) throws IOException {
        return exec(command, envp, null);
    }

    public Process exec(String command, String[] envp, File dir) throws IOException {
        if (command.length() == 0) throw new IllegalArgumentException("Empty command");
        StringTokenizer st = new StringTokenizer(command);
        String[] cmdarray = new String[st.countTokens()];
        for (int i = 0; st.hasMoreTokens(); i++) cmdarray[i] = st.nextToken();
        return exec(cmdarray, envp, dir);
    }

    public Process exec(String cmdarray[]) throws IOException {
        return exec(cmdarray, null, null);
    }

    public Process exec(String[] cmdarray, String[] envp) throws IOException {
        return exec(cmdarray, envp, null);
    }

    public Process exec(String[] cmdarray, String[] envp, File dir) throws IOException {
        return new ProcessBuilder(cmdarray).environment(envp).directory(dir).start();
    }

    public native int availableProcessors();

    public native long freeMemory();

    public native long totalMemory();

    public native long maxMemory();

    public native void gc();

    native public void runFinalization();

    public native void traceInstructions(boolean on);

    public native void traceMethodCalls(boolean on);

    native public void load(String filename);

    native synchronized void load0(Class fromClass, String filename);

    native public void loadLibrary(String libname);

    native synchronized void loadLibrary0(Class fromClass, String libname);

    @Deprecated
    public InputStream getLocalizedInputStream(InputStream in) {
        return in;
    }

    @Deprecated
    public OutputStream getLocalizedOutputStream(OutputStream out) {
        return out;
    }
}