Java tutorial
/** * Copyright (C) 2009 GIP RECIA http://www.recia.fr * @Author (C) 2009 GIP RECIA <contact@recia.fr> * @Contributor (C) 2009 SOPRA http://www.sopragroup.com/ * @Contributor (C) 2011 Pierre Legay <pierre.legay@recia.fr> * * 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. */ /* * 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.apache.myfaces.shared_impl.renderkit; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import javax.faces.FacesException; import javax.faces.component.UIOutput; import javax.faces.component.UISelectMany; import javax.faces.context.FacesContext; import javax.faces.convert.Converter; import javax.faces.convert.ConverterException; import javax.faces.el.ValueBinding; import java.lang.reflect.Array; import java.util.ArrayList; import java.util.List; /** * The util methods in this class are shared between the javax.faces.component package and * the org.apache.myfaces.renderkit package. * Please note: Any changes here must also apply to the class in the other package! * * @author Manfred Geiler (latest modification by $Author: grantsmith $) * @version $Revision: 472618 $ $Date: 2006-11-08 21:06:54 +0100 (Mi, 08 Nov 2006) $ */ class _SharedRendererUtils { static Converter findUIOutputConverter(FacesContext facesContext, UIOutput component) { // Attention! // This code is duplicated in jsfapi component package. // If you change something here please do the same in the other class! Converter converter = component.getConverter(); if (converter != null) return converter; //Try to find out by value binding ValueBinding vb = component.getValueBinding("value"); if (vb == null) return null; Class valueType = vb.getType(facesContext); if (valueType == null) return null; if (String.class.equals(valueType)) return null; //No converter needed for String type if (Object.class.equals(valueType)) return null; //There is no converter for Object class try { return facesContext.getApplication().createConverter(valueType); } catch (FacesException e) { log(facesContext, "No Converter for type " + valueType.getName() + " found", e); return null; } } static Object getConvertedUISelectManyValue(FacesContext facesContext, UISelectMany component, String[] submittedValue) throws ConverterException { // Attention! // This code is duplicated in jsfapi component package. // If you change something here please do the same in the other class! if (submittedValue == null) throw new NullPointerException("submittedValue"); ValueBinding vb = component.getValueBinding("value"); Class valueType = null; Class arrayComponentType = null; if (vb != null) { valueType = vb.getType(facesContext); if (valueType != null && valueType.isArray()) { arrayComponentType = valueType.getComponentType(); } } Converter converter = component.getConverter(); if (converter == null) { if (valueType == null) { // No converter, and no idea of expected type // --> return the submitted String array return submittedValue; } if (List.class.isAssignableFrom(valueType)) { // expected type is a List // --> according to javadoc of UISelectMany we assume that the element type // is java.lang.String, and copy the String array to a new List int len = submittedValue.length; List lst = new ArrayList(len); for (int i = 0; i < len; i++) { lst.add(submittedValue[i]); } return lst; } if (arrayComponentType == null) { throw new IllegalArgumentException("ValueBinding for UISelectMany must be of type List or Array"); } if (String.class.equals(arrayComponentType)) return submittedValue; //No conversion needed for String type if (Object.class.equals(arrayComponentType)) return submittedValue; //No conversion for Object class try { converter = facesContext.getApplication().createConverter(arrayComponentType); } catch (FacesException e) { log(facesContext, "No Converter for type " + arrayComponentType.getName() + " found", e); return submittedValue; } if (converter == null) { log(facesContext, "No Converter for type " + arrayComponentType.getName() + " found.", null); return submittedValue; } } // Now, we have a converter... // We determine the type of the component array after converting one of it's elements if (vb != null) { valueType = vb.getType(facesContext); if (valueType != null && valueType.isArray()) { if (submittedValue.length > 0) { arrayComponentType = converter.getAsObject(facesContext, component, submittedValue[0]) .getClass(); } } } if (valueType == null) { // ...but have no idea of expected type // --> so let's convert it to an Object array int len = submittedValue.length; Object[] convertedValues = (Object[]) Array .newInstance(arrayComponentType == null ? Object.class : arrayComponentType, len); for (int i = 0; i < len; i++) { convertedValues[i] = converter.getAsObject(facesContext, component, submittedValue[i]); } return convertedValues; } if (List.class.isAssignableFrom(valueType)) { // Curious case: According to specs we should assume, that the element type // of this List is java.lang.String. But there is a Converter set for this // component. Because the user must know what he is doing, we will convert the values. int len = submittedValue.length; List lst = new ArrayList(len); for (int i = 0; i < len; i++) { lst.add(converter.getAsObject(facesContext, component, submittedValue[i])); } return lst; } if (arrayComponentType == null) { throw new IllegalArgumentException("ValueBinding for UISelectMany must be of type List or Array"); } if (arrayComponentType.isPrimitive()) { //primitive array int len = submittedValue.length; Object convertedValues = Array.newInstance(arrayComponentType, len); for (int i = 0; i < len; i++) { Array.set(convertedValues, i, converter.getAsObject(facesContext, component, submittedValue[i])); } return convertedValues; } else { //Object array int len = submittedValue.length; ArrayList convertedValues = new ArrayList(len); for (int i = 0; i < len; i++) { convertedValues.add(i, converter.getAsObject(facesContext, component, submittedValue[i])); } return convertedValues.toArray((Object[]) Array.newInstance(arrayComponentType, len)); } } private static final Log log = LogFactory.getLog(_SharedRendererUtils.class); /** * This method is different in the two versions of _SharedRendererUtils. */ private static void log(FacesContext context, String msg, Exception e) { if (e != null) { log.error(msg, e); } else { log.error(msg); } } }