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JSR-000372: JavaServer(TM) Faces 2.3 API
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/*
 * Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package javax.faces.component;

import javax.faces.context.FacesContext;
import javax.faces.application.Application;

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

class SharedUtils {

    /*
    * Determine whether String is a mixed value binding expression or not.
    */
    static boolean isMixedExpression(String expression) {

        if (null == expression) {
            return false;
        }

        // if it doesn't start and end with delimiters
        return (!(expression.startsWith("#{") && expression.endsWith("}")))
                  && isExpression(expression);

    }


    /*
    * Determine whether String is a value binding expression or not.
    */
    static boolean isExpression(String expression) {

        if (null == expression) {
            return false;
        }

        //check to see if attribute has an expression
        int start = expression.indexOf("#{");
        return start != -1 && expression.indexOf('}', start+2) != -1;
    }

    static Map> evaluateExpressions(FacesContext context, Map> map) {
        if (map != null && !map.isEmpty()) {
            Map> ret = new HashMap>(map.size());
            for (Map.Entry> entry : map.entrySet()) {
                ret.put(entry.getKey(), evaluateExpressions(context, entry.getValue()));
            }
            
            return ret;
        }
        
        return map;
    }
     
    static List evaluateExpressions(FacesContext context, List values) {
         if (!values.isEmpty()) {
             List ret = new ArrayList(values.size());
             Application app = context.getApplication();
             for (String val : values) {
                 if (val != null) {
                     String value = val.trim();
                     if (isExpression(value)) {
                         value = app.evaluateExpressionGet(context,
                                                           value,
                                                           String.class);
                     }
                     ret.add(value);
                 }
             }
             
             return ret;
         }
         return values;
     }



}