RegexSetupValidityChecker.java

/*
 * RHQ Management Platform
 * Copyright (C) 2005-2008 Red Hat, Inc.
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
package org.rhq.enterprise.communications.util.prefs;

import java.io.PrintWriter;
import java.util.prefs.Preferences;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;

import org.rhq.enterprise.communications.i18n.CommI18NFactory;

/**
 * A validity checker that validates that the new value is a valid boolean (true or false).
 *
 * @author Joseph Marques
 */
public class RegexSetupValidityChecker implements SetupValidityChecker {

    private Pattern pattern;
    private String resourceKeyName;
    private Object[] resourceKeyArguments;

    public RegexSetupValidityChecker(String regexPattern, String resourceKeyName, Object... resourceKeyArguments) {
        this.pattern = Pattern.compile(regexPattern);
        this.resourceKeyName = resourceKeyName;
        this.resourceKeyArguments = resourceKeyArguments;
    }

    public RegexSetupValidityChecker(String regexPattern, int flags, String resourceKeyName,
        Object... resourceKeyArguments) {
        this.pattern = Pattern.compile(regexPattern, flags);
        this.resourceKeyName = resourceKeyName;
        this.resourceKeyArguments = resourceKeyArguments;
    }

    /**
     * Makes sure the new value is either "true" or "false".
     *
     * @see SetupValidityChecker#checkValidity(String, String, Preferences, PrintWriter)
     */
    public boolean checkValidity(String pref_name, String value_to_check, Preferences preferences, PrintWriter out) {

        try {
            boolean matches = pattern.matcher(value_to_check).matches();

            if (!matches) {
                out.println(CommI18NFactory.getMsg().getMsg(resourceKeyName, resourceKeyArguments));
                return false;
            }

        } catch (PatternSyntaxException pse) {
            out.println(CommI18NFactory.getMsg().getMsg(resourceKeyName, resourceKeyArguments));
            return false;
        }

        return true;
    }
}