jakarta.faces.component.SharedUtils Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of jakarta.faces-api Show documentation

Jakarta Faces defines an MVC framework for building user interfaces for web applications, including UI components, state management, event handing, input validation, page navigation, and support for internationalization and accessibility.

There is a newer version: 4.1.0

Show newest version

/*
 * Copyright (c) 1997, 2020 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 jakarta.faces.component;

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

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

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;
    }

}