com.healthcit.analytics.dao.CouchDBDaoUtils.java Source code

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Here is the source code for com.healthcit.analytics.dao.CouchDBDaoUtils.java

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/*******************************************************************************
 * Copyright (c) 2013 HealthCare It, Inc.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the BSD 3-Clause license
 * which accompanies this distribution, and is available at
 * http://directory.fsf.org/wiki/License:BSD_3Clause
 * 
 * Contributors:
 *     HealthCare It, Inc - initial API and implementation
 ******************************************************************************/
package com.healthcit.analytics.dao;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.lang.ArrayUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.healthcit.analytics.utils.PropertyUtils;
import com.healthcit.cacure.dao.CouchDBDao;

public class CouchDBDaoUtils {

    @SuppressWarnings("unused")
    private static Logger log = LoggerFactory.getLogger(CouchDBDaoUtils.class);
    private static String COUCHDB_SERVER_HOST = PropertyUtils.getProperty("couchDBServer");
    private static String COUCHDB_SERVER_PORT = PropertyUtils.getProperty("couchDBPort");
    private static String COUCHDB_DBNAME = PropertyUtils.getProperty("couchDBDatabaseName");
    private static String COUCHDB_DESIGN_DOC = PropertyUtils.getProperty("couchDBDesignDoc");
    private static String COUCHDB_VIEW_NAME = PropertyUtils.getProperty("couchDBViewName");
    private static String COUCHDB_CACURE_DBNAME = PropertyUtils.getProperty("couchDBCacureDatabaseName");
    private static String COUCHDB_CACURE_DESIGNDOC = PropertyUtils.getProperty("couchDBCacureDesignDoc");
    private static final String VIEW_NAME = "viewName";
    private static final String[] STANDARD_COUCHDB_PARAM_NAMES = new String[] { "key", "startkey", "startkey_docid",
            "endkey", "endkey_docid", "limit", "stale", "descending", "skip", "group", "group_level", "reduce",
            "include_docs", "inclusive_end" };
    //   private static String HTTP_PREFIX = "http";
    private static String UTF8 = "UTF8";
    private static CouchDBDao couchDao = null;

    public static CouchDBDao getCouchDBDaoInstance() {
        if (couchDao == null) {
            couchDao = new CouchDBDao();
            couchDao.setSourceDbName(COUCHDB_DBNAME);
            couchDao.setDesignDoc(COUCHDB_DESIGN_DOC);
            couchDao.setHost(COUCHDB_SERVER_HOST);
            couchDao.setPort(Integer.parseInt(COUCHDB_SERVER_PORT));
            couchDao.setCacureSourceDbName(COUCHDB_CACURE_DBNAME);
            couchDao.setCacureDesignDoc(COUCHDB_CACURE_DESIGNDOC);
        }
        return couchDao;
    }

    public static String getCouchViewName(HttpServletRequest request) {
        String viewName = request.getParameter(VIEW_NAME);

        if (viewName == null)
            viewName = COUCHDB_VIEW_NAME;
        return viewName;
    }

    /**
     * Constructs a URL-encoded String of request parameters from a set of parameter key/value pairs.
     * @param paramKeys
     * @param paramValues
     * @return
     */
    @SuppressWarnings("unchecked")
    public static String constructParameterList(HttpServletRequest request) {
        Enumeration<String> requestParamNames = request.getParameterNames();

        List<String> names = new ArrayList<String>();

        List<String> values = new ArrayList<String>();

        while (requestParamNames.hasMoreElements()) {
            String element = requestParamNames.nextElement();

            if (ArrayUtils.contains(STANDARD_COUCHDB_PARAM_NAMES, element)) {
                names.add(element);

                values.add(request.getParameter(element));
            }
        }

        StringBuffer str = new StringBuffer();

        if (names != null && names.size() == values.size()) {
            for (int i = 0; i < names.size(); ++i) {
                if (i > 0)
                    str.append("&");

                String key = names.get(i);

                String value = values.get(i);

                str.append(key);

                str.append("=");

                try {
                    str.append(URLEncoder.encode(value, UTF8));
                } catch (UnsupportedEncodingException e) {
                }
            }
        }
        return str.toString();
    }

}