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package de.danoeh.antennapod.feed;
import java.util.ArrayList;
import java.util.Collections;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import android.util.Log;
import de.danoeh.antennapod.AppConfig;
import de.danoeh.antennapod.PodcastApp;
import de.danoeh.antennapod.R;
import de.danoeh.antennapod.util.comparator.SearchResultValueComparator;
/** Performs search on Feeds and FeedItems */
public class FeedSearcher {
private static final String TAG = "FeedSearcher";
// Search result values
private static final int VALUE_FEED_TITLE = 3;
private static final int VALUE_ITEM_TITLE = 2;
private static final int VALUE_ITEM_CHAPTER = 1;
private static final int VALUE_ITEM_DESCRIPTION = 0;
private static final int VALUE_WORD_MATCH = 4;
/** Performs a search in all feeds or one specific feed. */
public static ArrayList<SearchResult> performSearch(final String query,
Feed selectedFeed) {
String lcQuery = query.toLowerCase();
ArrayList<SearchResult> result = new ArrayList<SearchResult>();
if (selectedFeed == null) {
if (AppConfig.DEBUG)
Log.d(TAG, "Performing global search");
if (AppConfig.DEBUG)
Log.d(TAG, "Searching Feed titles");
searchFeedtitles(lcQuery, result);
} else if (AppConfig.DEBUG) {
Log.d(TAG, "Performing search on specific feed");
}
if (AppConfig.DEBUG)
Log.d(TAG, "Searching Feeditem titles");
searchFeedItemTitles(lcQuery, result, selectedFeed);
if (AppConfig.DEBUG)
Log.d(TAG, "Searching item-chaptertitles");
searchFeedItemChapters(lcQuery, result, selectedFeed);
if (AppConfig.DEBUG)
Log.d(TAG, "Searching item descriptions");
searchFeedItemDescription(lcQuery, result, selectedFeed);
if (AppConfig.DEBUG)
Log.d(TAG, "Searching item content encoded data");
searchFeedItemContentEncoded(lcQuery, result, selectedFeed);
if (AppConfig.DEBUG)
Log.d(TAG, "Sorting results");
Collections.sort(result, new SearchResultValueComparator());
return result;
}
private static void searchFeedtitles(String query,
ArrayList<SearchResult> destination) {
FeedManager manager = FeedManager.getInstance();
for (Feed feed : manager.getFeeds()) {
SearchResult result = createSearchResult(feed, query, feed
.getTitle().toLowerCase(), VALUE_FEED_TITLE);
if (result != null) {
destination.add(result);
}
}
}
private static void searchFeedItemTitles(String query,
ArrayList<SearchResult> destination, Feed selectedFeed) {
FeedManager manager = FeedManager.getInstance();
if (selectedFeed == null) {
for (Feed feed : manager.getFeeds()) {
searchFeedItemTitlesSingleFeed(query, destination, feed);
}
} else {
searchFeedItemTitlesSingleFeed(query, destination, selectedFeed);
}
}
private static void searchFeedItemTitlesSingleFeed(String query,
ArrayList<SearchResult> destination, Feed feed) {
for (FeedItem item : feed.getItems()) {
SearchResult result = createSearchResult(item, query, item
.getTitle().toLowerCase(), VALUE_ITEM_TITLE);
if (result != null) {
result.setSubtitle(PodcastApp.getInstance().getString(
R.string.found_in_title_label));
destination.add(result);
}
}
}
private static void searchFeedItemChapters(String query,
ArrayList<SearchResult> destination, Feed selectedFeed) {
FeedManager manager = FeedManager.getInstance();
if (selectedFeed == null) {
for (Feed feed : manager.getFeeds()) {
searchFeedItemChaptersSingleFeed(query, destination, feed);
}
} else {
searchFeedItemChaptersSingleFeed(query, destination, selectedFeed);
}
}
private static void searchFeedItemChaptersSingleFeed(String query,
ArrayList<SearchResult> destination, Feed feed) {
for (FeedItem item : feed.getItems()) {
if (item.getChapters() != null) {
for (Chapter sc : item.getChapters()) {
SearchResult result = createSearchResult(item, query, sc
.getTitle().toLowerCase(), VALUE_ITEM_CHAPTER);
if (result != null) {
result.setSubtitle(PodcastApp.getInstance().getString(
R.string.found_in_chapters_label));
destination.add(result);
}
}
}
}
}
private static void searchFeedItemDescription(String query,
ArrayList<SearchResult> destination, Feed selectedFeed) {
FeedManager manager = FeedManager.getInstance();
if (selectedFeed == null) {
for (Feed feed : manager.getFeeds()) {
searchFeedItemDescriptionSingleFeed(query, destination, feed);
}
} else {
searchFeedItemDescriptionSingleFeed(query, destination,
selectedFeed);
}
}
private static void searchFeedItemDescriptionSingleFeed(String query,
ArrayList<SearchResult> destination, Feed feed) {
for (FeedItem item : feed.getItems()) {
if (item.getDescription() != null) {
SearchResult result = createSearchResult(item, query, item
.getDescription().toLowerCase(), VALUE_ITEM_DESCRIPTION);
if (result != null) {
result.setSubtitle(PodcastApp.getInstance().getString(
R.string.found_in_shownotes_label));
destination.add(result);
}
}
}
}
private static void searchFeedItemContentEncoded(String query,
ArrayList<SearchResult> destination, Feed selectedFeed) {
FeedManager manager = FeedManager.getInstance();
if (selectedFeed == null) {
for (Feed feed : manager.getFeeds()) {
searchFeedItemContentEncodedSingleFeed(query, destination, feed);
}
} else {
searchFeedItemContentEncodedSingleFeed(query, destination,
selectedFeed);
}
}
private static void searchFeedItemContentEncodedSingleFeed(String query,
ArrayList<SearchResult> destination, Feed feed) {
for (FeedItem item : feed.getItems()) {
if (!destination.contains(item) && item.getContentEncoded() != null) {
SearchResult result = createSearchResult(item, query, item
.getContentEncoded().toLowerCase(),
VALUE_ITEM_DESCRIPTION);
if (result != null) {
result.setSubtitle(PodcastApp.getInstance().getString(
R.string.found_in_shownotes_label));
destination.add(result);
}
}
}
}
private static SearchResult createSearchResult(FeedComponent component,
String query, String text, int baseValue) {
int bonus = 0;
boolean found = false;
// try word search
Pattern word = Pattern.compile("\b" + query + "\b");
Matcher matcher = word.matcher(text);
found = matcher.find();
if (found) {
bonus = VALUE_WORD_MATCH;
} else {
// search for other occurence
found = text.contains(query);
}
if (found) {
return new SearchResult(component, baseValue + bonus);
} else {
return null;
}
}
}
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