// Copyright 2006 Daniel Gredler

 //

 // 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,

 // 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 net.sf.beanform;

 import java.util.Iterator;

 import java.util.Map;

 import net.sf.beanform.prop.BeanProperty;

 import org.apache.hivemind.ApplicationRuntimeException;

 import org.apache.tapestry.IComponent;

 import org.apache.tapestry.form.IFormComponent;

 /**

  * A low level BeanForm component that renders labels for all the properties.

  * This component must be wrapped by a {@link BeanFormRows} component.

  *

  * @author Daniel Gredler

  */

 public abstract class BeanFormLabel extends BeanFormRowComponent {

     final static String PROPERTYSELECTION_BLOCK_ID = "propertySelectionBlock";

     final static String CUSTOM_BLOCK_ID = "customBlock";

     final static String TEXTFIELD_BLOCK_ID = "textFieldBlock";

     final static String TEXTAREA_BLOCK_ID = "textAreaBlock";

     final static String CHECKBOX_BLOCK_ID = "checkboxBlock";

     final static String DATEPICKER_BLOCK_ID = "datePickerBlock";

     final static String UPLOAD_BLOCK_ID = "uploadBlock";

     final static String INSERT_BLOCK_ID = "insertBlock";

     public IComponent getLabelBlock() {

         BeanProperty property = this.getProperty();

         if( this.hasPropertySelectionModel( property, true ) ) return this.getComponent( PROPERTYSELECTION_BLOCK_ID );

         else if( this.hasCustomField( property ) ) return this.getComponent( CUSTOM_BLOCK_ID );

         else if( property.usesTextField() ) return this.getComponent( TEXTFIELD_BLOCK_ID );

         else if( property.usesTextArea() ) return this.getComponent( TEXTAREA_BLOCK_ID );

         else if( property.usesCheckbox() ) return this.getComponent( CHECKBOX_BLOCK_ID );

         else if( property.usesDatePicker() ) return this.getComponent( DATEPICKER_BLOCK_ID );

         else if( property.usesUpload() ) return this.getComponent(  UPLOAD_BLOCK_ID );

         else if( property.usesInsert() ) return this.getComponent( INSERT_BLOCK_ID );

         else {

             String msg = BeanFormMessages.cantFindFieldForProperty( property );

             throw new ApplicationRuntimeException( msg );

         }

     }

     public IFormComponent getPropertySelection() {

         return this.getField( BeanFormField.PROPERTYSELECTION_FIELD_ID );

     }

     public IFormComponent getTextField() {

         return this.getField( BeanFormField.TEXTFIELD_FIELD_ID );

     }

     public IFormComponent getTextArea() {

         return this.getField( BeanFormField.TEXTAREA_FIELD_ID );

     }

     public IFormComponent getCheckbox() {

         return this.getField( BeanFormField.CHECKBOX_FIELD_ID );

     }

     public IFormComponent getDatePicker() {

         return this.getField( BeanFormField.DATEPICKER_FIELD_ID );

     }

     public IFormComponent getUpload() {

         return this.getField( BeanFormField.UPLOAD_FIELD_ID );

     }

     /**

      * Called whenever a label needs its field. This method expects the label's "prerender"

      * attribute to be set to <tt>true</tt> (the default), as it adds any extra user-specified

      * informal bindings to the field before returning it, in anticipation of a prerender.

      */

     private IFormComponent getField( String id ) {

         IFormComponent field = null;

         Map siblings = this.getContainer().getComponents();

         for( Iterator i = siblings.values().iterator(); i.hasNext(); ) {

             IComponent sibling = (IComponent) i.next();

             if( sibling instanceof BeanFormField ) {

                 field = (IFormComponent) sibling.getComponent( id );

                 this.addExtraBindings( field );

                 break;

             }

         }

         return field;

     }

 }