/**
 * Created on Apr 10, 2002
 *
 * To change this generated comment edit the template variable "filecomment":
 * Workbench>Preferences>Java>Templates.
 */
package org.eclipse.pde.internal.core;


import java.io.File;

import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Path;
import org.eclipse.core.runtime.Preferences;
import org.eclipse.jdt.core.ClasspathVariableInitializer;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.core.JavaModelException;

/**
 *
 */
public class EclipseHomeInitializer extends ClasspathVariableInitializer {

	/**
	 * Constructor for EclipseHomeInitializer.
	 */
	public EclipseHomeInitializer() {
		super();
	}

	/**
	 * @see ClasspathVariableInitializer#initialize(String)
	 */
	public void initialize(String variable) {
		resetEclipseHomeVariables();
	}

	public static void resetEclipseHomeVariables() {
		String[] variables = JavaCore.getClasspathVariableNames();

		// Remove all ECLIPSE_HOME* variables (except for ECLIPSE_HOME)
		for (int i = 0; i < variables.length; i++) {
			if (variables[i].startsWith(PDECore.ECLIPSE_HOME_VARIABLE)
				&& !variables[i].equals(PDECore.ECLIPSE_HOME_VARIABLE)) {
				JavaCore.removeClasspathVariable(variables[i], null);
			}
		}
		try {
			// Initialize the ECLIPSE_HOME variable
			Preferences pref = PDECore.getDefault().getPluginPreferences();
			String platformHome = pref.getString(ICoreConstants.PLATFORM_PATH);
			JavaCore.setClasspathVariable(
				PDECore.ECLIPSE_HOME_VARIABLE,
				new Path(platformHome),
				null);

			// Go through all the link files, and create an ECLIPSE_HOME_* variable
			// for every link.
			File[] linkFiles = PluginPathFinder.getLinkFiles(platformHome);
			if (linkFiles != null) {
				for (int i = 0; i < linkFiles.length; i++) {
					String path = PluginPathFinder.getPath(platformHome, linkFiles[i]);
					if (path != null) {
						String variable =
							PDECore.ECLIPSE_HOME_VARIABLE + "_"
								+ linkFiles[i].getName().replace('.', '_').toUpperCase();
						JavaCore.setClasspathVariable(variable, new Path(path), null);
					}
				}
			}
		} catch (JavaModelException e) {
		}
	}
}