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PrimeFaces is one of the most popular UI libraries in Java EE Ecosystem and widely used by software companies, world renowned brands, banks, financial institutions, insurance companies, universities and more.

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/**
 * The MIT License
 *
 * Copyright (c) 2009-2019 PrimeTek
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.primefaces.expression.impl;

import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.faces.FacesException;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import org.primefaces.expression.MultiSearchExpressionResolver;
import org.primefaces.expression.SearchExpressionResolver;
import org.primefaces.util.ComponentTraversalUtils;

public class IdExpressionResolver implements SearchExpressionResolver, MultiSearchExpressionResolver {

    private static final Pattern PATTERN = Pattern.compile("@id\\(([\\w-]+)\\)");

    @Override
    public UIComponent resolveComponent(FacesContext context, UIComponent source, UIComponent last, String expression, int options) {
        return ComponentTraversalUtils.firstWithId(extractId(expression), last);
    }

    @Override
    public void resolveComponents(FacesContext context, UIComponent source, UIComponent last, String expression, List components, int options) {
        ComponentTraversalUtils.withId(
                extractId(expression),
                last,
                components);
    }

    protected String extractId(String expression) {
        try {
            Matcher matcher = PATTERN.matcher(expression);

            if (matcher.matches()) {

                return matcher.group(1);

            }
            else {
                throw new FacesException("Expression does not match following pattern @id(id). Expression: \"" + expression + "\"");
            }

        }
        catch (Exception e) {
            throw new FacesException("Expression does not match following pattern @id(id). Expression: \"" + expression + "\"", e);
        }
    }
}