# LabelExpression.java

    /*
    *  Copyright (c) 2005-2010, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
    *
    *  WSO2 Inc. licenses this file to you under the Apache License,
    *  Version 2.0 (the "License"); you may not use this file except
    *  in compliance with the License.
    *  You may obtain a copy of the License at
    *
    *    http://www.apache.org/licenses/LICENSE-2.0
    *
    * Unless required by applicable law or agreed to in writing,
    * software distributed under the License is distributed on an
    * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    * KIND, either express or implied.  See the License for the
    * specific language governing permissions and limitations
    * under the License.
    */

    package org.apache.synapse.commons.templates.uri.parser;

    import org.apache.synapse.commons.templates.uri.URITemplateException;

    import java.util.Map;

    public class LabelExpression extends SimpleStringExpression {

        public LabelExpression(String token) throws URITemplateException {
            super(token);
        }

        @Override
        String expand(Map<String, String> variables) {
            String result = super.expand(variables);
            if (result != null) {
                return getSeparator() + result;
            }
            return result;
        }

        @Override
        int match(String uriFragment, Map<String, String> variables) {
            if (uriFragment.startsWith(String.valueOf(getSeparator()))) {
                return super.match(uriFragment.substring(1), variables) + 1;
            }
            return 0;
        }

        @Override
        protected char getSeparator() {
            return '.';
        }

        @Override
        char getFirstCharacter() {
            return getSeparator();
        }
    }