org.eclipse.egf.model/src/org/eclipse/egf/model/helper/ValidationHelper.java

/**
 * Copyright (c) 2009-2010 Thales Corporate Services S.A.S.
 * 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:
 * Thales Corporate Services S.A.S - initial API and implementation
 */
package org.eclipse.egf.model.helper;

import java.util.Map;

import org.eclipse.egf.common.helper.ClassHelper;
import org.eclipse.egf.core.EGFCorePlugin;
import org.eclipse.egf.core.fcore.IPlatformFcore;
import org.eclipse.egf.core.helper.BundleSessionHelper;
import org.eclipse.egf.core.preferences.IEGFModelConstants;
import org.eclipse.egf.core.session.ProjectBundleSession;
import org.eclipse.egf.model.EGFModelPlugin;
import org.eclipse.emf.ecore.EObject;
import org.osgi.framework.Bundle;

/**
 * @author Xavier Maysonnave
 * 
 */
public class ValidationHelper {

  private ValidationHelper() {
    // Prevent Instantiation
  }

  public static boolean isLoadableClass(EObject eObject, String value, Map<Object, Object> context) {
    if (context != null && context.get(IEGFModelConstants.VALIDATE_TYPES) == Boolean.FALSE) {
      return true;
    }
    if (eObject.eResource() == null || value == null || value.trim().length() == 0) {
      return true;
    }
    IPlatformFcore platformFcore = EGFCorePlugin.getPlatformFcore(eObject.eResource());
    if (platformFcore == null) {
      return true;
    }
    // Retrieve Session if any
    if (context.get(ProjectBundleSession.PROJECT_BUNDLE_SESSION) == null) {
      return true;
    }
    ProjectBundleSession session = (ProjectBundleSession) context.get(ProjectBundleSession.PROJECT_BUNDLE_SESSION);
    try {
      Bundle bundle = BundleSessionHelper.getBundle(session, platformFcore);
      if (bundle == null) {
        return true;
      }
      // Load Class
      Class<?> clazz = null;
      try {
        clazz = bundle.loadClass(value.trim());
      } catch (Throwable t) {
        // Nothing to do
      }
      if (clazz == null) {
        return false;
      }
    } catch (Throwable t) {
      EGFModelPlugin.getPlugin().logError(t);
    }
    return true;
  }

  public static boolean isValidClass(EObject eObject, Class<?> type, String value, Map<Object, Object> context) {
    if (context != null && context.get(IEGFModelConstants.VALIDATE_TYPES) == Boolean.FALSE) {
      return true;
    }
    if (eObject.eResource() == null || type == null || value == null || value.trim().length() == 0) {
      return true;
    }
    IPlatformFcore platformFcore = EGFCorePlugin.getPlatformFcore(eObject.eResource());
    if (platformFcore == null) {
      return true;
    }
    // Retrieve Session if any
    if (context.get(ProjectBundleSession.PROJECT_BUNDLE_SESSION) == null) {
      return true;
    }
    ProjectBundleSession session = (ProjectBundleSession) context.get(ProjectBundleSession.PROJECT_BUNDLE_SESSION);
    try {
      Bundle bundle = BundleSessionHelper.getBundle(session, platformFcore);
      if (bundle == null) {
        return true;
      }
      // Load Class
      Class<?> clazz = null;
      try {
        clazz = bundle.loadClass(value.trim());
      } catch (Throwable t) {
        // Nothing to do
      }
      if (clazz == null) {
        return true;
      }
      // Valid Value
      if (ClassHelper.asSubClass(clazz, type) == false) {
        return false;
      }
    } catch (Throwable t) {
      EGFModelPlugin.getPlugin().logError(t);
    }
    return true;
  }

}