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JSF components and utilities that can be used with any JSF implementation. This library is based on the JSF1.1 version of Tomahawk, but with minor source code and build changes to take advantage of JSF2.1 features. A JSF2.1 implementation is required to use this version of the Tomahawk library.

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/*
 * 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_tomahawk.application;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.faces.context.FacesContext;

/**
 * 
 * @author Leonardo Uribe
 *
 */
public class NavigationUtils
{
    /**
     * Evaluate all EL expressions found as parameters and return a map that can be used for 
     * redirect or render bookmark links
     * 
     * @param parameters parameter map retrieved from NavigationCase.getParameters()
     * @return
     */
    public static Map > getEvaluatedNavigationParameters(
            FacesContext facesContext, 
            Map > parameters)
    {
        Map> evaluatedParameters = null;
        if (parameters != null && parameters.size() > 0)
        {
            evaluatedParameters = new HashMap>();
            for (Map.Entry> pair : parameters.entrySet())
            {
                boolean containsEL = false;
                for (String value : pair.getValue())
                {
                    if (_isExpression(value))
                    {
                        containsEL = true;
                        break;
                    }
                }
                if (containsEL)
                {
                    evaluatedParameters.put(pair.getKey(), 
                            _evaluateValueExpressions(facesContext, pair.getValue()));
                }
                else
                {
                    evaluatedParameters.put(pair.getKey(), pair.getValue());
                }
            }
        }
        else
        {
            evaluatedParameters = parameters;
        }
        return evaluatedParameters;
    }
    
    /**
     * Checks the Strings in the List for EL expressions and evaluates them.
     * Note that the returned List will be a copy of the given List, because
     * otherwise it will have unwanted side-effects.
     * @param values
     * @return
     */
    private static List _evaluateValueExpressions(FacesContext context, List values)
    {
        // note that we have to create a new List here, because if we
        // change any value on the given List, it will be changed in the
        // NavigationCase too and the EL expression won't be evaluated again
        List target = new ArrayList(values.size());
        for (String value : values)
        {
            if (_isExpression(value))
            {
                // evaluate the ValueExpression
                value = context.getApplication().evaluateExpressionGet(context, value, String.class);
            }
            target.add(value);
        }
        return target;
    }
    
    private static boolean _isExpression(String text)
    {
        return text.indexOf("#{") != -1;
    }

}