org.cloudml.connectors.util.CloudMLQueryUtil.java Source code

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Here is the source code for org.cloudml.connectors.util.CloudMLQueryUtil.java

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/**
 * This file is part of CloudML [ http://cloudml.org ]
 *
 * Copyright (C) 2012 - SINTEF ICT
 * Contact: Franck Chauvel <franck.chauvel@sintef.no>
 *
 * Module: root
 *
 * CloudML is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version.
 *
 * CloudML 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General
 * Public License along with CloudML. If not, see
 * <http://www.gnu.org/licenses/>.
 */
/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

package org.cloudml.connectors.util;

import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.commons.jxpath.JXPathContext;

/**
 *
 * @author Hui Song
 */
public class CloudMLQueryUtil {

    private static Pattern selfPattern = Pattern.compile("@self\\{[^\\{\\}]*\\}");
    private static Pattern instPattern = Pattern.compile("@instance\\{[^\\{\\}]*\\}");

    public static Object cloudmlQuery(String jxpath, Object context) {
        JXPathContext jxpathcontext = JXPathContext.newContext(context);
        return jxpathcontext.getValue(jxpath);
    }

    public static String cloudmlStringRecover(String string, Object self, Object instance) {
        while (true) {
            Matcher matcher = selfPattern.matcher(string);
            if (matcher.find()) {
                String rawQuery = matcher.group();
                String query = rawQuery.substring(6, rawQuery.length() - 1);

                string = string.replaceAll(Pattern.quote(rawQuery), cloudmlQuery(query, self).toString());
                continue;
            }

            matcher = instPattern.matcher(string);
            if (matcher.find()) {
                String rawQuery = matcher.group();
                String query = rawQuery.substring(10, rawQuery.length() - 1);

                string = string.replaceAll(Pattern.quote(rawQuery), cloudmlQuery(query, instance).toString());
                continue;
            }
            break;
        }
        return string;
    }

    public static void main(String[] args) {
        Matcher matcher = selfPattern.matcher(
                "@self{properties/entry_spring}::@self{a}//bean[@id=\"dataSource\"]/property[@name=\"url\"]/@value");
        while (matcher.find()) {
            System.out.println(matcher.group());
            System.out.println("--");
        }

        System.out.println("12345".substring(2, 4));

        System.out.println(cloudmlStringRecover(
                "@self{properties/entry_spring}::@instance{a}//bean[@id=\"dataSource\"]/property[@name=\"url\"]/@value",
                null, null));
    }
}