/*
 * Copyright 2004-2011 the Seasar Foundation and the Others.
 *
 * 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.seasar.teeda.extension.render.html;

import java.util.Date;

import javax.faces.component.UIOutput;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.convert.DateTimeConverter;

import org.seasar.teeda.core.application.ApplicationImpl;
import org.seasar.teeda.core.render.AbstractInputRenderer;
import org.seasar.teeda.core.util.RendererUtil;

/**
 * @author higa
 */
public abstract class THtmlCalendarRendererUtil extends AbstractInputRenderer {

    protected THtmlCalendarRendererUtil() {
    }

    public static DateTimeConverter getConverter(FacesContext context,
            UIOutput component) {
        Converter converter = RendererUtil.findConverter(context, component);
        if (converter == null) {
            converter = ApplicationImpl.getWellKnownConverter(Date.class);
        }
        if (!(converter instanceof DateTimeConverter)) {
            throw new IllegalStateException(
                    "converter is not DateTimeConverter");
        }
        return (DateTimeConverter) converter;
    }
}