com.bazaarvoice.seo.sdk.util.BVUtilty.java Source code

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Here is the source code for com.bazaarvoice.seo.sdk.util.BVUtilty.java

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/*
 * ===========================================================================
 * Copyright 2014 Bazaarvoice, Inc.
 * 
 * Licensed 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 com.bazaarvoice.seo.sdk.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.commons.lang3.StringUtils;
import org.apache.http.NameValuePair;
import org.apache.http.client.utils.URLEncodedUtils;

/**
 * Bazaarvoice utility class.
 * 
 * @author Anandan Narayanaswamy
 *
 */
public final class BVUtilty {

    private static Pattern BV_PATTERN = null;

    private BVUtilty() {

    }

    public static String getPageNumber(String queryString) {
        if (queryString != null && queryString.length() > 0) {
            List<NameValuePair> parameters = URLEncodedUtils.parse(queryString, Charset.forName("UTF-8"));
            for (NameValuePair parameter : parameters) {
                if (parameter.getName().equals("bvrrp") || parameter.getName().equals("bvqap")) {
                    final Pattern p = Pattern.compile("^[^/]+/\\w+/\\w+/(\\d+)/[^/]+\\.htm$");
                    return matchPageNumber(p, parameter.getValue());
                } else if (parameter.getName().equals("bvsyp")) {
                    final Pattern p = Pattern.compile("^[^/]+/\\w+/\\w+/(\\d+)[[/\\w+]|[^/]]+\\.htm$");
                    return matchPageNumber(p, parameter.getValue());
                } else if (parameter.getName().equals("bvpage")) {
                    final Pattern p = Pattern.compile("^\\w+/(\\d+)$");
                    return matchPageNumber(p, parameter.getValue());
                }
            }
        }
        return "1";
    }

    private static String matchPageNumber(Pattern pattern, String value) {
        Matcher m = pattern.matcher(value);
        if (m.matches()) {
            return m.group(1);
        } else {
            return "1";
        }
    }

    public static String getQueryString(String uri) {

        if (StringUtils.isBlank(uri)) {
            return "";
        }

        URI _uri = null;
        try {
            _uri = new URI(uri);
        } catch (Exception ex) {
            ex.printStackTrace();
        }

        return _uri.getQuery();
    }

    public static String readFile(String path) throws IOException {
        FileInputStream stream = new FileInputStream(new File(path));
        try {
            FileChannel fc = stream.getChannel();
            MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
            return Charset.forName("UTF-8").decode(bb).toString();
        } finally {
            stream.close();
        }
    }

    /**
     * Utility method to replace the string from StringBuilder.
     * @param sb         StringBuilder object.
     * @param toReplace      The String that should be replaced.
     * @param replacement   The String that has to be replaced by.
     * 
     */
    public static void replaceString(StringBuilder sb, String toReplace, String replacement) {
        int index = -1;
        while ((index = sb.lastIndexOf(toReplace)) != -1) {
            sb.replace(index, index + toReplace.length(), replacement);
        }
    }

    public static String removeBVQuery(String queryUrl) {

        final URI uri;
        try {
            uri = new URI(queryUrl);
        } catch (URISyntaxException e) {
            return queryUrl;
        }

        try {
            String newQuery = null;
            if (uri.getQuery() != null && uri.getQuery().length() > 0) {
                List<NameValuePair> newParameters = new ArrayList<NameValuePair>();
                List<NameValuePair> parameters = URLEncodedUtils.parse(uri.getQuery(), Charset.forName("UTF-8"));
                List<String> bvParameters = Arrays.asList("bvrrp", "bvsyp", "bvqap", "bvpage");
                for (NameValuePair parameter : parameters) {
                    if (!bvParameters.contains(parameter.getName())) {
                        newParameters.add(parameter);
                    }
                }
                newQuery = newParameters.size() > 0
                        ? URLEncodedUtils.format(newParameters, Charset.forName("UTF-8"))
                        : null;

            }
            return new URI(uri.getScheme(), uri.getAuthority(), uri.getPath(), newQuery, null).toString();
        } catch (URISyntaxException e) {
            return queryUrl;
        }
    }

    /**
     * Validates if the content has a valid bv content.
     * This is used to validate if the response is not corrupted.
     * @param content
     * @return
     */
    public static boolean validateBVContent(String content) {
        if (BV_PATTERN == null) {
            BV_PATTERN = Pattern.compile(BVConstant.BV_STRING_PATTERN, Pattern.CASE_INSENSITIVE);
        }

        Matcher m = BV_PATTERN.matcher(content);
        return m.find();
    }

}