Caplet: changing JVM classpath according to platform and architecture

SWTLoader.java

import static com.google.common.base.Preconditions.checkState;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map.Entry;

public final class SWTLoader extends Capsule {

    // ~ Constructors ----------------------------------------------------------------------------------------------

    protected SWTLoader(final Capsule pred) {
        super(pred);
    }

    // ~ Methods ---------------------------------------------------------------------------------------------------

    @Override
    @SuppressWarnings("unchecked")
    protected <T> T attribute(final Entry<String, T> attr) {
        if (ATTR_JVM_ARGS == attr && isMac()) {
            final List<String> args = new ArrayList<>(super.attribute(ATTR_JVM_ARGS));
            args.add("-XstartOnFirstThread");
            return (T) args;

        } else if (ATTR_APP_CLASS_PATH == attr) {
            List<Object> appClassPath = new ArrayList<>(super.attribute(ATTR_APP_CLASS_PATH));
            appClassPath.set(1, new ArrayList<>((List<Object>) appClassPath.get(1)));

            String dataModel = System.getProperty("sun.arch.data.model");

            boolean bit64 = false;
            switch (dataModel) {
                case "32":
                    bit64 = false;
                    break;
                case "64":
                    bit64 = true;
                    break;
                default:
                    checkState(false, "unknown data-model: '%s'", dataModel);
                    break;
            }

            Iterator<Object> myIt = ((List<Object>) appClassPath.get(1)).iterator();

            while (myIt.hasNext()) {
                Object p = myIt.next();
                if (p.toString().contains("org.eclipse.swt.win32.win32.x86_64-")) {
                    if (!isWindows() || !bit64) {
                        log(LOG_DEBUG, "removed " + p);
                        myIt.remove();
                    }
                }
                if (p.toString().contains("org.eclipse.swt.win32.win32.x86-")) {
                    if (!isWindows() || bit64) {
                        log(LOG_DEBUG, "removed " + p);
                        myIt.remove();
                    }
                }
                if (p.toString().contains("org.eclipse.swt.cocoa.macosx.x86_64-")) {
                    if (!isMac()) {
                        log(LOG_DEBUG, "removed " + p);
                        myIt.remove();
                    }
                }
            }
            return (T) appClassPath;

        } else {
            return super.attribute(attr);
        }
    }
}