/*******************************************************************************
 * Copyright (c) 2000, 2007 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

package org.eclipse.jdt.launching;

import java.io.File;

import org.eclipse.core.runtime.IStatus;

/**
 * Represents a particular type of VM for which there may be
 * any number of VM installations. An example of a VM type
 * is the standard JRE which might have instances corresponding
 * to different installed versions such as JRE 1.2.2 and
 * JRE 1.3.
 * <p>
 * This interface is intended to be implemented by clients that contribute
 * to the <code>"org.eclipse.jdt.launching.vmInstallTypes"</code> extension point.
 * </p>
 *
 * @see	IVMInstall
 */
public interface IVMInstallType {
	/**
	 * Creates a new instance of this VM Install type.
	 * The newly created IVMInstall is managed by this IVMInstallType.
	 *
	 * @param	id	An id String that must be unique within this IVMInstallType.
	 *
	 * @return the newly created VM instance
	 *
	 * @throws	IllegalArgumentException	If the id exists already.
	 */
	IVMInstall createVMInstall(String id);
	/**
	 * Finds the VM with the given id.
	 *
	 * @param id the VM id
	 * @return a VM instance, or <code>null</code> if not found
	 */
	IVMInstall findVMInstall(String id);
	/**
	 * Finds the VM with the given name.
	 *
	 * @param name the VM name
	 * @return a VM instance, or <code>null</code> if not found
	 * @since 2.0
	 */
	IVMInstall findVMInstallByName(String name);

	/**
	 * Remove the VM associated with the given id from the set of VMs managed by
	 * this VM type. Has no effect if a VM with the given id is not currently managed
	 * by this type.
	 * A VM install that is disposed may not be used anymore.
	 *
	 * @param id the id of the VM to be disposed.
	 */
	void disposeVMInstall(String id);
	/**
	 * Returns all VM instances managed by this VM type.
	 *
	 * @return the list of VM instances managed by this VM type
	 */
	IVMInstall[] getVMInstalls();
	/**
	 * Returns the display name of this VM type.
	 *
	 * @return the name of this IVMInstallType
	 */
	String getName();

	/**
	 * Returns the globally unique id of this VM type.
	 * Clients are responsible for providing a unique id.
	 *
	 * @return the id of this IVMInstallType
	 */
	String getId();
	/**
	 * Validates the given location of a VM installation.
	 * <p>
	 * For example, an implementation might check whether the VM executable
	 * is present.
	 * </p>
	 *
	 * @param installLocation the root directory of a potential installation for
	 *   this type of VM
	 * @return a status object describing whether the install location is valid
	 */
	IStatus validateInstallLocation(File installLocation);

	/**
	 * Tries to detect an installed VM that matches this VM install type.
	 * Typically, this method will detect the VM installation the
	 * Eclipse platform runs on. Implementers should return <code>null</code> if they
	 * can't assure that a given vm install matches this IVMInstallType.
	 * @return The location of an VM installation that can be used
	 * 			with this VM install type, or <code>null</code> if unable
	 * 			to locate an installed VM.
	 */
	File detectInstallLocation();

	/**
	 * Returns a collection of <code>LibraryLocation</code>s that represent the
	 * default system libraries of this VM install type, if a VM was installed
	 * at the given <code>installLocation</code>.
	 * The returned <code>LibraryLocation</code>s may not exist if the
	 * <code>installLocation</code> is not a valid install location.
	 *
	 * @param installLocation home location
	 * @see LibraryLocation
	 * @see IVMInstallType#validateInstallLocation(File)
	 *
	 * @return default library locations based on the given <code>installLocation</code>.
	 * @since 2.0
	 */
	LibraryLocation[] getDefaultLibraryLocations(File installLocation);
}