org.eclipse.egf.core.ui/src/org/eclipse/egf/core/ui/contributor/PropertyEditorContributor.java

/**
 * <copyright>
 * 
 * Copyright (c) 2009 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
 * 
 * </copyright>
 */

package org.eclipse.egf.core.ui.contributor;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.Platform;
import org.eclipse.egf.core.ui.EGFCoreUIPlugin;
import org.eclipse.emf.edit.provider.IItemPropertyDescriptor;
import org.eclipse.jface.viewers.CellEditor;
import org.eclipse.swt.widgets.Composite;

/**
 * @author Thomas Guiu
 * 
 */
public interface PropertyEditorContributor {

  public static final String EXTENSION_ID = "org.eclipse.egf.core.ui.editor.property.contributor"; //$NON-NLS-1$

  boolean canApply(Object object, IItemPropertyDescriptor descriptor);

  CellEditor createPropertyEditor(final Composite composite, Object object, IItemPropertyDescriptor descriptor);

  Helper HELPER = new Helper();

  class Helper {

    private final List<PropertyEditorContributor> contributors = new ArrayList<PropertyEditorContributor>();

    // TODO returns only the first one ?
    public PropertyEditorContributor selectPropertyEditor(Object object, IItemPropertyDescriptor descriptor) {
      if (!descriptor.canSetProperty(object))
        return null;

      for (PropertyEditorContributor contributor : contributors) {
        if (contributor.canApply(object, descriptor))
          return contributor;
      }
      return null;
    }

    private Helper() {
      super();
      for (IConfigurationElement element : Platform.getExtensionRegistry().getConfigurationElementsFor(EXTENSION_ID)) {
        try {
          PropertyEditorContributor contributor = (PropertyEditorContributor) element.createExecutableExtension("class"); //$NON-NLS-1$
          contributors.add(contributor);
        } catch (CoreException e) {
          EGFCoreUIPlugin.getDefault().logError(e);
        }
      }
    }
  }

}