001    package org.apache.myfaces.tobago.util;
002    
003    /*
004     * Licensed to the Apache Software Foundation (ASF) under one or more
005     * contributor license agreements.  See the NOTICE file distributed with
006     * this work for additional information regarding copyright ownership.
007     * The ASF licenses this file to You under the Apache License, Version 2.0
008     * (the "License"); you may not use this file except in compliance with
009     * the License.  You may obtain a copy of the License at
010     *
011     *      http://www.apache.org/licenses/LICENSE-2.0
012     *
013     * Unless required by applicable law or agreed to in writing, software
014     * distributed under the License is distributed on an "AS IS" BASIS,
015     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016     * See the License for the specific language governing permissions and
017     * limitations under the License.
018     */
019    
020    import org.apache.myfaces.tobago.context.ClientProperties;
021    
022    import javax.faces.application.Application;
023    import javax.faces.context.FacesContext;
024    import javax.faces.el.ValueBinding;
025    import javax.faces.el.VariableResolver;
026    
027    /**
028     * @deprecated Please use VariableResolverUtils
029     */
030    @Deprecated
031    public final class VariableResolverUtil {
032    
033      private VariableResolverUtil() {
034        // utils class
035      }
036    
037      /**
038       * Returns the requested object configured in the faces-config or from library.
039       */
040      public static Object resolveVariable(FacesContext context, String variable) {
041        Application application = context.getApplication();
042        VariableResolver variableResolver = application.getVariableResolver();
043        return variableResolver.resolveVariable(context, variable);
044      }
045    
046      /**
047       * Returns the ClientProperties object configured in the faces-config.
048       */
049      public static ClientProperties resolveClientProperties(FacesContext facesContext) {
050        return (ClientProperties) resolveVariable(facesContext, ClientProperties.MANAGED_BEAN_NAME);
051      }
052      
053      /**
054       * Clears the value of the variable.
055       * Useful for cleaning up e.g. a session or application variable
056       * to save memory without the knowledge of the scope.
057       * Also useful to enforce a new creation of a managed-bean.
058       */
059      public static void clearVariable(FacesContext context, String variable) {
060        Application application = context.getApplication();
061        ValueBinding valueBinding = application.createValueBinding("#{" + variable + "}");
062        valueBinding.setValue(context, null);
063      }
064    }