JsfUtil.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.superbiz.moviefun.util;

import javax.faces.application.FacesMessage;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.model.SelectItem;
import java.util.List;

public class JsfUtil {

    public static SelectItem[] getSelectItems(final List<?> entities, final boolean selectOne) {
        final int size = selectOne ? entities.size() + 1 : entities.size();
        final SelectItem[] items = new SelectItem[size];
        int i = 0;
        if (selectOne) {
            items[0] = new SelectItem("", "---");
            i++;
        }
        for (final Object x : entities) {
            items[i++] = new SelectItem(x, x.toString());
        }
        return items;
    }

    public static void addErrorMessage(final Exception ex, final String defaultMsg) {
        final String msg = ex.getLocalizedMessage();
        if (msg != null && msg.length() > 0) {
            addErrorMessage(msg);
        } else {
            addErrorMessage(defaultMsg);
        }
    }

    public static void addErrorMessages(final List<String> messages) {
        for (final String message : messages) {
            addErrorMessage(message);
        }
    }

    public static void addErrorMessage(final String msg) {
        final FacesMessage facesMsg = new FacesMessage(FacesMessage.SEVERITY_ERROR, msg, msg);
        FacesContext.getCurrentInstance().addMessage(null, facesMsg);
    }

    public static void addSuccessMessage(final String msg) {
        final FacesMessage facesMsg = new FacesMessage(FacesMessage.SEVERITY_INFO, msg, msg);
        FacesContext.getCurrentInstance().addMessage("successInfo", facesMsg);
    }

    public static String getRequestParameter(final String key) {
        return FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap().get(key);
    }

    public static Object getObjectFromRequestParameter(final String requestParameterName, final Converter converter, final UIComponent component) {
        final String theId = JsfUtil.getRequestParameter(requestParameterName);
        return converter.getAsObject(FacesContext.getCurrentInstance(), component, theId);
    }

}