environment.description.0 = Minimum environment to run the OSGi framework 1.0

environment.description.1 = Minimum environment to run the OSGi framework 1.1

environment.description.2 = Java Runtime Environment 1.1

environment.description.3 = Java 2 Platform, Standard Edition 1.2

environment.description.4 = Java 2 Platform, Standard Edition 1.3

environment.description.5 = Java 2 Platform, Standard Edition 1.4

environment.description.6 = Java 2 Platform, Standard Edition 5.0

environment.description.7 = CDC 1.0, Foundation 1.0

environment.description.8 = CDC 1.1, Foundation 1.1

environment.description.9 = Java Platform, Standard Edition 6.0

/*******************************************************************************

 * Copyright (c) 2006 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.internal.launching.environments;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import java.util.StringTokenizer;

import org.eclipse.core.runtime.CoreException;

import org.eclipse.core.runtime.IProgressMonitor;

import org.eclipse.jdt.launching.IVMInstall;

import org.eclipse.jdt.launching.IVMInstall2;

import org.eclipse.jdt.launching.IVMInstall3;

import org.eclipse.jdt.launching.JavaRuntime;

import org.eclipse.jdt.launching.environments.CompatibleEnvironment;

import org.eclipse.jdt.launching.environments.IExecutionEnvironment;

import org.eclipse.jdt.launching.environments.IExecutionEnvironmentAnalyzerDelegate;

import org.eclipse.jdt.launching.environments.IExecutionEnvironmentsManager;

public class ExecutionEnvironmentAnalyzer implements IExecutionEnvironmentAnalyzerDelegate {

	private static final String JavaSE_1_6 = "JavaSE-1.6"; //$NON-NLS-1$

	private static final String J2SE_1_5 = "J2SE-1.5"; //$NON-NLS-1$

	private static final String J2SE_1_4 = "J2SE-1.4"; //$NON-NLS-1$

	private static final String J2SE_1_3 = "J2SE-1.3"; //$NON-NLS-1$

	private static final String J2SE_1_2 = "J2SE-1.2"; //$NON-NLS-1$

	private static final String JRE_1_1 = "JRE-1.1"; //$NON-NLS-1$

	private static final String CDC_FOUNDATION_1_1 = "CDC-1.1/Foundation-1.1"; //$NON-NLS-1$

	private static final String CDC_FOUNDATION_1_0 = "CDC-1.0/Foundation-1.0"; //$NON-NLS-1$

	private static final String OSGI_MINIMUM_1_0 = "OSGi/Minimum-1.0"; //$NON-NLS-1$

	private static final String OSGI_MINIMUM_1_1 = "OSGi/Minimum-1.1"; //$NON-NLS-1$

	private static final String JAVA_SPEC_VERSION = "java.specification.version"; //$NON-NLS-1$

	private static final String JAVA_SPEC_NAME = "java.specification.name"; //$NON-NLS-1$

	private static final String JAVA_VERSION = "java.version"; //$NON-NLS-1$

	private static final String[] VM_PROPERTIES = {JAVA_SPEC_NAME, JAVA_SPEC_VERSION, JAVA_VERSION};

	private static final String FOUNDATION = "foundation"; //$NON-NLS-1$

	private static final Map mappings = new HashMap();

	static {

		// table where the key is the EE and the value is an array of EEs that it is a super-set of

		mappings.put(CDC_FOUNDATION_1_0, new String[] {OSGI_MINIMUM_1_0});

		mappings.put(CDC_FOUNDATION_1_1, new String[] {CDC_FOUNDATION_1_0, OSGI_MINIMUM_1_1});

		mappings.put(OSGI_MINIMUM_1_1, new String[] {OSGI_MINIMUM_1_0});

		mappings.put(J2SE_1_2, new String[] {JRE_1_1});

		mappings.put(J2SE_1_3, new String[] {J2SE_1_2, CDC_FOUNDATION_1_0, OSGI_MINIMUM_1_0});

		mappings.put(J2SE_1_4, new String[] {J2SE_1_3, CDC_FOUNDATION_1_1, OSGI_MINIMUM_1_1});

		mappings.put(J2SE_1_5, new String[] {J2SE_1_4});

		mappings.put(JavaSE_1_6, new String[] {J2SE_1_5});

	}

	public CompatibleEnvironment[] analyze(IVMInstall vm, IProgressMonitor monitor) throws CoreException {

		ArrayList result = new ArrayList();

		if (!(vm instanceof IVMInstall2))

			return new CompatibleEnvironment[0];

		IVMInstall2 vm2 = (IVMInstall2) vm;

		List types = null;

		String javaVersion = vm2.getJavaVersion();

		if (javaVersion == null) {

			// We have a contributed VM type. Check to see if its a foundation VM, if we can.

			if ((vm instanceof IVMInstall3) && isFoundation1_0((IVMInstall3) vm)) 

				types = getTypes(CDC_FOUNDATION_1_0);

			else if ((vm instanceof IVMInstall3) && isFoundation1_1((IVMInstall3) vm)) 

				types = getTypes(CDC_FOUNDATION_1_1);

		} else {

			if (javaVersion.startsWith("1.6")) //$NON-NLS-1$

				types = getTypes(JavaSE_1_6);

			else if (javaVersion.startsWith("1.5")) //$NON-NLS-1$

				types = getTypes(J2SE_1_5);

			else if (javaVersion.startsWith("1.4")) //$NON-NLS-1$

				types = getTypes(J2SE_1_4);

			else if (javaVersion.startsWith("1.3")) //$NON-NLS-1$

				types = getTypes(J2SE_1_3);

			else if (javaVersion.startsWith("1.2")) //$NON-NLS-1$

				types = getTypes(J2SE_1_2);

			else if (javaVersion.startsWith("1.1")) { //$NON-NLS-1$

				if ((vm instanceof IVMInstall3) && isFoundation1_1((IVMInstall3) vm))

					types = getTypes(CDC_FOUNDATION_1_1);

				else

					types = getTypes(JRE_1_1);

			} else if (javaVersion.startsWith("1.0")) { //$NON-NLS-1$

				if ((vm instanceof IVMInstall3) && isFoundation1_0((IVMInstall3) vm)) 

					types = getTypes(CDC_FOUNDATION_1_0);

			}

		}

		if (types != null) {

			for (int i=0; i < types.size(); i++)

				addEnvironment(result, (String) types.get(i), i ==0);

		}

		return (CompatibleEnvironment[])result.toArray(new CompatibleEnvironment[result.size()]);

	}

	/*

	 * Check a couple of known system properties for the word "foundation".

	 */

	private boolean isFoundation(Map properties) {

		for (int i=0; i < VM_PROPERTIES.length; i++) {

			String value = (String) properties.get(VM_PROPERTIES[i]);

			if (value == null)

				continue;

			for (StringTokenizer tokenizer = new StringTokenizer(value); tokenizer.hasMoreTokens(); )

				if (FOUNDATION.equalsIgnoreCase(tokenizer.nextToken()))

					return true;

		}

		return false;

	}

	private boolean isFoundation1_0(IVMInstall3 vm) throws CoreException {

		Map map = vm.evaluateSystemProperties(VM_PROPERTIES, null);

		return isFoundation(map) ? "1.0".equals(map.get(JAVA_SPEC_VERSION)) : false; //$NON-NLS-1$

	}

	private boolean isFoundation1_1(IVMInstall3 vm) throws CoreException {

		Map map = vm.evaluateSystemProperties(VM_PROPERTIES, null);

		return isFoundation(map) ? "1.1".equals(map.get(JAVA_SPEC_VERSION)) : false; //$NON-NLS-1$

	}

	private void addEnvironment(ArrayList result, String id, boolean strict) {

		IExecutionEnvironmentsManager manager = JavaRuntime.getExecutionEnvironmentsManager();

		IExecutionEnvironment env = manager.getEnvironment(id);

		if (env != null)

			result.add(new CompatibleEnvironment(env, strict));

	}

	// first entry in the list is the perfect match

	private List getTypes(String type) {

		List result = new ArrayList();

		result.add(type);

		String[] values = (String[]) mappings.get(type);

		if (values != null) {

			for (int i=0; i<values.length; i++)

				result.addAll(getTypes(values[i]));

		}

		return result;

	}

}