UISupportRegistery.java

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 *
 * Pentaho Data Integration
 *
 * Copyright (C) 2002-2013 by Pentaho : http://www.pentaho.com
 *
 *******************************************************************************
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
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package org.pentaho.di.ui.repository.repositoryexplorer;

import java.util.HashMap;
import java.util.Map;

import org.pentaho.di.repository.IRepositoryService;
import org.pentaho.di.ui.repository.repositoryexplorer.model.UIObjectCreationException;
import org.pentaho.di.ui.repository.repositoryexplorer.uisupport.IRepositoryExplorerUISupport;

public class UISupportRegistery {

  private static UISupportRegistery instance;

  private static Map<Class<? extends IRepositoryService>, Class<? extends IRepositoryExplorerUISupport>> uiSupportMap;

  private UISupportRegistery() {
    uiSupportMap =
      new HashMap<Class<? extends IRepositoryService>, Class<? extends IRepositoryExplorerUISupport>>();
  }

  public static UISupportRegistery getInstance() {
    if ( instance == null ) {
      instance = new UISupportRegistery();
    }
    return instance;
  }

  public void registerUISupport( Class<? extends IRepositoryService> service,
    Class<? extends IRepositoryExplorerUISupport> supportClass ) {
    uiSupportMap.put( service, supportClass );
  }

  public IRepositoryExplorerUISupport createUISupport( Class<? extends IRepositoryService> service ) throws UIObjectCreationException {
    Class<? extends IRepositoryExplorerUISupport> supportClass = uiSupportMap.get( service );
    if ( supportClass != null ) {
      return contruct( supportClass );
    } else {
      return null;
    }

  }

  private IRepositoryExplorerUISupport contruct( Class<? extends IRepositoryExplorerUISupport> supportClass ) throws UIObjectCreationException {
    try {
      return supportClass.newInstance();
    } catch ( Throwable th ) {
      throw new UIObjectCreationException( th );

    }
  }
}