/**

  * Copyright 2010 The Kuali Foundation Licensed under the

  * Educational Community 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.osedu.org/licenses/ECL-2.0

  *

  * Unless required by applicable law or agreed to in writing,

  * software distributed under the License is distributed on an "AS IS"

  * BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express

  * or implied. See the License for the specific language governing

  * permissions and limitations under the License.

  */

 package org.kuali.student.common.ui.client.configurable.mvc;

 import org.kuali.student.common.assembly.data.LookupParamMetadata;

 import org.kuali.student.common.assembly.data.Metadata;

 import org.kuali.student.common.assembly.data.MetadataInterrogator;

 import org.kuali.student.common.assembly.data.MetadataInterrogator.ConstraintIds;

 import org.kuali.student.common.ui.client.configurable.mvc.impl.DefaultWidgetFactoryImpl;

 import com.google.gwt.core.client.GWT;

 import com.google.gwt.user.client.ui.Widget;

 /**

  * Returns a corresponding auto generated widget based on metadata.  Not all fields can have their

  * widgets reliably generated (or it may be better to not use the default), in these cases pass the

  * custom widget into FieldDescriptor directly.

  * <br>

  * Things within the metadata taken into account:

  * access = meta.getWriteAccess(); <br>

  * isMultiLine - uses text area for multiline<br>

  * isRepeating - if this is true and the metadata has lookupdata generates a picker that can be used to produce a list<br>

  * isRichText = MetadataInterrogator.hasConstraint(meta, ConstraintIds.RICH_TEXT); <br>

  * maxLength - affects how long a text field will be<br>

  * type - affects why kind of widget is generated<br>

  * lookupMeta - generates a widget that is backed by a search and based on attributes in its lookupMeta<br>

  * additionalLookups - additional lookups for the generated widget<br>

  * canEdit <br>

  * canUnmask <br>

  * canView <br>

  * 

  * Note that this class can use gwt deferred binding to have its DefaultWidgetFactory implementation

  * overridden with a custom one, though the result is high impact for as most fields rely on this class.

  * 

  * Default widget abstract class - see DefaultWidgetFactoryImpl for implementation.

  * 

  * @author Kuali Student Team

  *

  */

 public abstract class DefaultWidgetFactory {

         private static final DefaultWidgetFactory instance = GWT.create(DefaultWidgetFactoryImpl.class);

         public static DefaultWidgetFactory getInstance() {

                 return instance;

         }

         /**

          * Gets the input widget by auto generating based on the metadata within the FieldDescriptor passed in

          * @param meta

          * @return

          */

         public abstract Widget getWidget(FieldDescriptor field);

         /**

          * Gets the input widget by auto generating based on the metadata passed in

          * @param meta

          * @return

          */

         public abstract Widget getWidget(Metadata meta);

         /**

          * Gets the read only widget by auto generating based on the metadata passed in

          * @param meta

          * @return

          */

         public abstract Widget getReadOnlyWidget(Metadata meta);

         /**

          * Generates a widget based on the LookupParamMetadata passed in

          * @param meta

          * @return

          */

         public abstract Widget getWidget(LookupParamMetadata meta);

 }