/*
 * The contents of this file are subject to the terms of the Common Development and
 * Distribution License (the License). You may not use this file except in compliance with the
 * License.
 *
 * You can obtain a copy of the License at legal/CDDLv1.0.txt. See the License for the
 * specific language governing permission and limitations under the License.
 *
 * When distributing Covered Software, include this CDDL Header Notice in each file and include
 * the License file at legal/CDDLv1.0.txt. If applicable, add the following below the CDDL
 * Header, with the fields enclosed by brackets [] replaced by your own identifying
 * information: "Portions copyright [year] [name of copyright owner]".
 *
 * Copyright 2014-2016 ForgeRock AS.
 */

package com.sun.identity.common.configuration;

import com.sun.identity.sm.ServiceAttributeValidator;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.forgerock.openam.utils.CollectionUtils;

/**
 * Validates map value properties in Agent Properties. e.g.
 * <code>com.sun.identity.agents.config.response.attribute.mapping[]=</code>
 * Map values should be Strings of the form:
 *   [somekey] = somevalue
 *   etc 
 *   l.h.s is key value surrounded by brackets
 *   separator is mandatory "=" equals sign
 *   r.h.s is some string value, anything since this is not so fined- 
 *         grained to test values of any one specific property's value set.
 *   r.h.s can be empty or just whitespace 
 *   l.h.s key value can NOT be empty
 *   l.h.s key values can not be duplicates
 *   white space is allowed everywhere
 *   blank or empty values are allowed as some props dont have any value 
 *         to be specified
 *
 *   Some strange examples that would be acceptable values:
 *       blank or empty set
 *       [a_key_but_no_value]=     (note no value on r.h.s)
 *       []=                       (a common default value)
 *       [  ] =                    (variation on default value)
 *       [key_and_or_value_contains_=_sign] ==   (equal sign is valid data)
 *
 *   Note:
 *       brackets are not allowed as part of key or value data
 *       exact duplicate keys are allowed 
 *       
 */
public class DuplicateKeyMapValueValidator implements ServiceAttributeValidator {
     
    private static final String regularExpression = MapValueValidator.KEY_WITH_NO_BRACKETS 
                                    + "|" + MapValueValidator.DEFAULT_NO_KEY_JUST_BRACKETS;
    
    private static final Pattern pattern = Pattern.compile(regularExpression);

    /**
     * Returns <code>true</code> if values are of map type format.
     * 
     * @param values contains the set of values to be validated
     * @return <code>true</code> if values are of map type format
     */
    @Override
    public boolean validate(Set<String> values) {
        boolean valid = true; //blank or empty values set are valid
        if (!CollectionUtils.isEmpty(values)) {
            for (String val : values) {
                final String trimmed = val.trim();
                if (trimmed.length() > 0) {
                    Matcher matcher = pattern.matcher(trimmed);
                    valid = matcher.matches();
                }
            }
        }
        return valid;
    }
    
}
