/*
*  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();
    }
}