/*******************************************************************************
 * Copyright (c) 2000, 2011 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.launching;


import java.io.File;

import org.eclipse.debug.core.ILaunchManager;
import org.eclipse.jdt.launching.AbstractVMInstall;
import org.eclipse.jdt.launching.IVMInstallType;
import org.eclipse.jdt.launching.IVMRunner;
import org.eclipse.osgi.util.NLS;

public class StandardVM extends AbstractVMInstall {

	/**
	 * If a StandardVM returns a string for #getDebugArgs(), the string may contain
	 * the variable ${port}.  This will be replaced with the port that the vm is
	 * using when launching.
	 */
	public static final String VAR_PORT = "${port}"; //$NON-NLS-1$

	StandardVM(IVMInstallType type, String id) {
		super(type, id);
	}
	/* (non-Javadoc)
	 * @see org.eclipse.jdt.launching.IVMInstall#getVMRunner(java.lang.String)
	 */
	@Override
	public IVMRunner getVMRunner(String mode) {
		if (ILaunchManager.RUN_MODE.equals(mode)) {
			return new StandardVMRunner(this);
		} else if (ILaunchManager.DEBUG_MODE.equals(mode)) {
			return new StandardVMDebugger(this);
		}
		return null;
	}

    /* (non-Javadoc)
     * @see org.eclipse.jdt.launching.IVMInstall#getJavaVersion()
     */
    @Override
	public String getJavaVersion() {
        StandardVMType installType = (StandardVMType) getVMInstallType();
        File installLocation = getInstallLocation();
        if (installLocation != null) {
            File executable = getJavaExecutable();
            if (executable != null) {
                String vmVersion = installType.getVMVersion(installLocation, executable);
                // strip off extra info
                StringBuilder version = new StringBuilder();
                for (int i = 0; i < vmVersion.length(); i++) {
                    char ch = vmVersion.charAt(i);
                    if (Character.isDigit(ch) || ch == '.') {
                        version.append(ch);
                    } else {
                        break;
                    }
                }
                if (version.length() > 0) {
                    return version.toString();
                }
            }
            LaunchingPlugin.log(NLS.bind(LaunchingMessages.vmInstall_could_not_determine_java_Version, installLocation.getAbsolutePath()));
        }
        return null;
    }

    /**
     * Returns the java executable for this VM or <code>null</code> if cannot be found
     *
     * @return executable for this VM or <code>null</code> if none
     */
    File getJavaExecutable() {
    	File installLocation = getInstallLocation();
        if (installLocation != null) {
            return StandardVMType.findJavaExecutable(installLocation);
        }
        return null;
    }

    /**
     * Returns arguments used to start this VM in debug mode or
     * <code>null</code> if default arguments should be used.
     *
     * @return arguments used to start this VM in debug mode
     * or <code>null</code> if default arguments should be used
     */
    public String getDebugArgs() {
    	return null;
    }

}