71 lines
2.5 KiB
Java
71 lines
2.5 KiB
Java
package de.danoeh.antennapod.ui.chapters;
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import android.text.TextUtils;
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import android.util.Log;
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import androidx.annotation.Nullable;
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import de.danoeh.antennapod.model.feed.Chapter;
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import java.util.List;
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public class ChapterMerger {
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private static final String TAG = "ChapterMerger";
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private ChapterMerger() {
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}
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/**
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* This method might modify the input data.
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*/
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@Nullable
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public static List<Chapter> merge(@Nullable List<Chapter> chapters1, @Nullable List<Chapter> chapters2) {
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Log.d(TAG, "Merging chapters");
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if (chapters1 == null) {
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return chapters2;
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} else if (chapters2 == null) {
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return chapters1;
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} else if (chapters2.size() > chapters1.size()) {
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return chapters2;
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} else if (chapters2.size() < chapters1.size()) {
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return chapters1;
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} else {
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// Merge chapter lists of same length. Store in chapters2 array.
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// In case the lists can not be merged, return chapters1 array.
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for (int i = 0; i < chapters2.size(); i++) {
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Chapter chapterTarget = chapters2.get(i);
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Chapter chapterOther = chapters1.get(i);
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if (Math.abs(chapterTarget.getStart() - chapterOther.getStart()) > 1000) {
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Log.e(TAG, "Chapter lists are too different. Cancelling merge.");
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return score(chapters1) > score(chapters2) ? chapters1 : chapters2;
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}
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if (TextUtils.isEmpty(chapterTarget.getImageUrl())) {
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chapterTarget.setImageUrl(chapterOther.getImageUrl());
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}
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if (TextUtils.isEmpty(chapterTarget.getLink())) {
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chapterTarget.setLink(chapterOther.getLink());
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}
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if (TextUtils.isEmpty(chapterTarget.getTitle())) {
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chapterTarget.setTitle(chapterOther.getTitle());
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}
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}
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return chapters2;
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}
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}
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/**
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* Tries to give a score that can determine which list of chapters a user might want to see.
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*/
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private static int score(List<Chapter> chapters) {
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int score = 0;
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for (Chapter chapter : chapters) {
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score = score
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+ (TextUtils.isEmpty(chapter.getTitle()) ? 0 : 1)
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+ (TextUtils.isEmpty(chapter.getLink()) ? 0 : 1)
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+ (TextUtils.isEmpty(chapter.getImageUrl()) ? 0 : 1);
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}
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return score;
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}
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}
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