org.eclipse.egf.core.pde/src/org/eclipse/egf/core/pde/internal/extension/AbstractFcoreExtensionCommand.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.core.pde.internal.extension;

import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.egf.common.helper.ExtensionPointHelper;
import org.eclipse.egf.common.helper.URIHelper;
import org.eclipse.egf.core.fcore.IPlatformFcoreConstants;
import org.eclipse.egf.core.pde.plugin.AbstractExtensionChangesCommand;
import org.eclipse.emf.common.util.URI;

/**
 * Base class to implement commands that deal with 'fcore' extension-point.
 * 
 * @author Xavier Maysonnave
 */
public abstract class AbstractFcoreExtensionCommand extends AbstractExtensionChangesCommand {

  public IPath _path;

  /**
   * Constructor.
   * 
   * @param uri
   */
  protected AbstractFcoreExtensionCommand(IPath path) throws CoreException {
    super(ResourcesPlugin.getWorkspace().getRoot().getProject(path.segment(0)));
    _path = path;
  }

  /**
   * @see org.eclipse.egf.core.pde.plugin.AbstractExtensionChangesCommand#getExtensionChildName()
   */
  @Override
  protected String getExtensionChildName() {
    return IPlatformFcoreConstants.FCORE_EXTENSION_CHILD;
  }

  /**
   * @see org.eclipse.egf.core.pde.plugin.AbstractExtensionChangesCommand#getExtensionPointId()
   */
  @Override
  protected String getExtensionPointId() {
    return IPlatformFcoreConstants.FULLY_QUALIFIED_EXTENSION_POINT_ID;
  }

  /**
   * Get the id attribute of the children for the extension.
   * 
   * @return
   */
  @Override
  protected String getExtensionChildAttribute() {
    return ExtensionPointHelper.ATT_ID;
  }

  @Override
  protected boolean matchValue(String value) {
    if (value == null || value.trim().length() == 0) {
      return false;
    }
    URI uri = URIHelper.getPlatformURI(getBundleId(), value, true);
    if (uri.equals(getURI())) {
      return true;
    }
    return false;
  }

  @Override
  public String getValue() {
    return _path.removeFirstSegments(1).makeRelative().toString();
  }

  /**
   * Get the Fcore URI.
   * 
   * @return
   */
  protected URI getURI() {
    return URIHelper.getPlatformURI(_path);
  }

}