tapestry/tapestry-framework/src/java/org/apache/tapestry/wml/SelectionField.java

// Copyright 2004, 2005 The Apache Software Foundation
//
// 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 org.apache.tapestry.wml;

import org.apache.tapestry.IMarkupWriter;
import org.apache.tapestry.IRequestCycle;
import org.apache.tapestry.form.IPropertySelectionModel;

/**
 * SelectionField specifies a postfield element and it is used to complement the
 * {@link PropertySelection}component.
 * 
 * @author David Solis
 * @since 3.0
 */
public abstract class SelectionField extends AbstractPostfield
{

    /**
     * @see org.apache.tapestry.form.AbstractFormComponent#rewindFormComponent(org.apache.tapestry.IMarkupWriter,
     *      org.apache.tapestry.IRequestCycle)
     */
    protected void rewindFormComponent(IMarkupWriter writer, IRequestCycle cycle)
    {
        String optionValue = cycle.getParameter(getName());
        IPropertySelectionModel model = getModel();
        Object value = (optionValue == null) ? null : model
                .translateValue(optionValue);

        updateValue(value);
    }

    public abstract IPropertySelectionModel getModel();
}