Java tutorial
/* * Copyright (C) 2010 Garen J. Torikian * * 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 biz.varkon.shelvesom.provider.music; import java.io.IOException; import java.io.InputStream; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Calendar; import java.util.Collections; import java.util.HashMap; import java.util.List; import org.apache.http.HttpHost; import org.apache.http.client.methods.HttpGet; import org.xmlpull.v1.XmlPullParser; import org.xmlpull.v1.XmlPullParserException; import android.content.ContentValues; import android.content.Context; import android.database.Cursor; import android.graphics.Bitmap; import android.net.Uri; import android.os.Parcel; import android.os.Parcelable; import android.provider.BaseColumns; import android.util.Log; import biz.varkon.shelvesom.base.BaseItem; import biz.varkon.shelvesom.base.BaseItem.ImageSize; import biz.varkon.shelvesom.server.ServerInfo; import biz.varkon.shelvesom.util.IOUtilities; import biz.varkon.shelvesom.util.IOUtilities.inputTypes; import biz.varkon.shelvesom.util.ImageUtilities; import biz.varkon.shelvesom.util.Preferences; import biz.varkon.shelvesom.util.TextUtilities; /** * Utility class to load music from a music store. */ public class MusicStore extends ServerInfo { static final String LOG_TAG = "MusicStore"; public static class Music extends BaseItem implements Parcelable, BaseColumns { public static final Uri CONTENT_URI = Uri.parse("content://MusicProvider/music"); List<String> mAuthors; List<Description> mDescriptions; private ServerImageLoader mLoader; List<String> mTracks; public static HashMap<ImageSize, String> mImages; @Override public String getImageUrl(ImageSize size) { String url = mImages.get(size); if (TextUtilities.isEmpty(url)) return null; else return TextUtilities.unprotectString(url); } Music() { mStorePrefix = ServerInfo.NAME; mLoader = new ServerImageLoader(); mImages = new HashMap<ImageSize, String>(6); mAuthors = new ArrayList<String>(1); mDescriptions = new ArrayList<Description>(); mTags = new ArrayList<String>(1); mTracks = new ArrayList<String>(1); } private Music(Parcel in) { mIsbn = in.readString(); mEan = in.readString(); mInternalId = in.readString(); mTitle = in.readString(); mAuthors = new ArrayList<String>(1); mTags = new ArrayList<String>(1); in.readStringList(mAuthors); } public List<String> getAuthors() { return mAuthors; } public List<Description> getDescriptions() { return mDescriptions; } public List<String> getTracks() { return mTracks; } @Override public Bitmap loadCover(ImageSize thumbnail) { final String url = mImages.get(thumbnail); if (TextUtilities.isEmpty(url)) return null; final ImageUtilities.ExpiringBitmap expiring; if (mLoader == null) { expiring = ImageUtilities.load(url); } else { expiring = mLoader.load(url); } mLastModified = expiring.lastModified; return expiring.bitmap; } public ContentValues getContentValues() { final SimpleDateFormat format = new SimpleDateFormat("MMMM yyyy"); final ContentValues values = new ContentValues(); values.put(INTERNAL_ID, ServerInfo.NAME + mInternalId); values.put(EAN, mEan); values.put(ISBN, mIsbn); values.put(UPC, mUpc); values.put(TITLE, mTitle); values.put(AUTHORS, TextUtilities.join(mAuthors, ", ")); values.put(LABEL, mLabel); values.put(REVIEWS, TextUtilities.join(mDescriptions, "\n\n")); if (mLastModified != null) { values.put(LAST_MODIFIED, mLastModified.getTimeInMillis()); } values.put(RELEASE_DATE, mReleaseDate != null ? format.format(mReleaseDate) : ""); values.put(DETAILS_URL, TextUtilities.protectString(mDetailsUrl)); final int density = Preferences.getDPI(); switch (density) { case 320: values.put(TINY_URL, TextUtilities.protectString(mImages.get(ImageSize.LARGE))); break; case 240: values.put(TINY_URL, TextUtilities.protectString(mImages.get(ImageSize.MEDIUM))); break; case 120: values.put(TINY_URL, TextUtilities.protectString(mImages.get(ImageSize.THUMBNAIL))); break; case 160: default: values.put(TINY_URL, TextUtilities.protectString(mImages.get(ImageSize.TINY))); break; } values.put(TAGS, TextUtilities.join(mTags, ", ")); values.put(FORMAT, mFormat); values.put(RETAIL_PRICE, mRetailPrice); values.put(RATING, mRating); values.put(LOANED_TO, mLoanedTo); if (mLoanDate != null) { values.put(LOAN_DATE, Preferences.getDateFormat().format(mLoanDate)); } if (mWishlistDate != null) { values.put(WISHLIST_DATE, Preferences.getDateFormat().format(mWishlistDate)); } values.put(EVENT_ID, mEventId); values.put(TRACKS, TextUtilities.join(mTracks, ", ")); values.put(NOTES, mNotes); values.put(QUANTITY, mQuantity); return values; } public static Music fromCursor(Cursor c) { final Music music = new Music(); music.mInternalId = c.getString(c.getColumnIndexOrThrow(INTERNAL_ID)) .substring(ServerInfo.NAME.length()); music.mEan = c.getString(c.getColumnIndexOrThrow(EAN)); music.mIsbn = c.getString(c.getColumnIndexOrThrow(ISBN)); music.mUpc = c.getString(c.getColumnIndexOrThrow(UPC)); music.mTitle = c.getString(c.getColumnIndexOrThrow(TITLE)); Collections.addAll(music.mAuthors, c.getString(c.getColumnIndexOrThrow(AUTHORS)).split(", ")); music.mLabel = c.getString(c.getColumnIndexOrThrow(LABEL)); music.mDescriptions.add(new Description("", c.getString(c.getColumnIndexOrThrow(REVIEWS)))); final Calendar calendar = Calendar.getInstance(); calendar.setTimeInMillis(c.getLong(c.getColumnIndexOrThrow(LAST_MODIFIED))); music.mLastModified = calendar; try { Collections.addAll(music.mTags, c.getString(c.getColumnIndexOrThrow(TAGS)).split(", ")); } catch (Exception e) { // GJT: Ignore, probably null } final SimpleDateFormat format = new SimpleDateFormat("MMMM yyyy"); try { music.mReleaseDate = format.parse(c.getString(c.getColumnIndexOrThrow(RELEASE_DATE))); } catch (ParseException e) { // Ignore } music.mDetailsUrl = TextUtilities.unprotectString(c.getString(c.getColumnIndexOrThrow(DETAILS_URL))); String tiny_url = c.getString(c.getColumnIndexOrThrow(TINY_URL)); if (tiny_url != null) { tiny_url = TextUtilities.unprotectString(c.getString(c.getColumnIndexOrThrow(TINY_URL))); final int density = Preferences.getDPI(); switch (density) { case 320: Music.mImages.put(ImageSize.LARGE, tiny_url); Music.mImages.put(ImageSize.THUMBNAIL, tiny_url.replace("zoom=1", "zoom=5")); break; case 240: Music.mImages.put(ImageSize.MEDIUM, tiny_url); Music.mImages.put(ImageSize.THUMBNAIL, tiny_url.replace("zoom=1", "zoom=5")); break; case 120: Music.mImages.put(ImageSize.THUMBNAIL, tiny_url); Music.mImages.put(ImageSize.THUMBNAIL, tiny_url); break; case 160: default: Music.mImages.put(ImageSize.TINY, tiny_url); Music.mImages.put(ImageSize.THUMBNAIL, tiny_url.replace("zoom=1", "zoom=5")); break; } } music.mFormat = c.getString(c.getColumnIndexOrThrow(FORMAT)); music.mRetailPrice = c.getString(c.getColumnIndexOrThrow(RETAIL_PRICE)); music.mRating = c.getInt(c.getColumnIndexOrThrow(RATING)); music.mLoanedTo = c.getString(c.getColumnIndex(LOANED_TO)); String loanDate = c.getString(c.getColumnIndexOrThrow(LOAN_DATE)); if (loanDate != null) { try { music.mLoanDate = Preferences.getDateFormat().parse(loanDate); } catch (ParseException e) { // Ignore } } String wishlistDate = c.getString(c.getColumnIndexOrThrow(WISHLIST_DATE)); if (wishlistDate != null) { try { music.mWishlistDate = Preferences.getDateFormat().parse(wishlistDate); } catch (ParseException e) { // Ignore } } music.mEventId = c.getInt(c.getColumnIndexOrThrow(EVENT_ID)); try { Collections.addAll(music.mTracks, c.getString(c.getColumnIndexOrThrow(TRACKS)).split(", ")); } catch (Exception e) { // GJT: Ignore, probably null } music.mNotes = c.getString(c.getColumnIndexOrThrow(NOTES)); music.mQuantity = c.getString(c.getColumnIndex(QUANTITY)); return music; } @Override public String toString() { return "Music[ISBN=" + mIsbn + ", EAN=" + mEan + ", UPC=" + mUpc + ", IID=" + mInternalId + "]"; } public int describeContents() { return 0; } public void writeToParcel(Parcel dest, int flags) { dest.writeString(mIsbn); dest.writeString(mEan); dest.writeString(mInternalId); dest.writeString(mTitle); dest.writeStringList(mAuthors); dest.writeStringList(mTags); } public static final Creator<Music> CREATOR = new Creator<Music>() { public Music createFromParcel(Parcel in) { return new Music(in); } public Music[] newArray(int size) { return new Music[size]; } }; } /** * Finds the music with the specified id. * * @param id * The id of the music to find (ISBN-10, ISBN-13, etc.) * @param mSavedImportType * * @return A Music instance if the music was found or null otherwise. */ public Music findMusic(String id, final IOUtilities.inputTypes mSavedImportType, Context context) { switch (id.length()) { case 10: android.util.Log.i(LOG_TAG, "Looking up ISBN: " + id); break; case 13: android.util.Log.i(LOG_TAG, "Looking up EAN: " + id); break; case 11: id = "00" + id; android.util.Log.i(LOG_TAG, "Looking up (doubly padded) EAN: " + id); break; case 12: id = "0" + id; android.util.Log.i(LOG_TAG, "Looking up (padded) EAN: " + id); break; default: android.util.Log.i(LOG_TAG, "Looking up ID: " + id); break; } Uri.Builder uri = assembleURI(id, mSavedImportType, context, VALUE_SEARCHINDEX_MUSIC, RESPONSE_TAG_EAN); HttpGet get = new HttpGet(uri.build().toString()); Music music = createMusic(); music = findMusicLookup(get, music, mSavedImportType, id); if (music != null) { return music; } music = createMusic(); uri = buildFindQuery(id, VALUE_SEARCHINDEX_MUSIC, context, RESPONSE_TAG_ASIN, VALUE_RESPONSEGROUP_LARGE); get = new HttpGet(uri.build().toString()); music = findMusicLookup(get, music, mSavedImportType, id); if (music != null) { return music; } music = createMusic(); uri = buildFindQuery(id, VALUE_SEARCHINDEX_MUSIC, context, RESPONSE_TAG_SKU, VALUE_RESPONSEGROUP_LARGE); get = new HttpGet(uri.build().toString()); music = findMusicLookup(get, music, mSavedImportType, id); if (music != null) { return music; } music = createMusic(); uri = buildFindQuery(id, VALUE_SEARCHINDEX_MUSIC, context, RESPONSE_TAG_UPC); get = new HttpGet(uri.build().toString()); music = findMusicLookup(get, music, mSavedImportType, id); if (music != null) { return music; } else { return null; } } private Music findMusicLookup(HttpGet get, final Music music, final inputTypes mSavedImportType, String id) { final boolean[] result = new boolean[1]; try { executeRequest(new HttpHost(mHost, 80, "http"), get, new ResponseHandler() { public void handleResponse(InputStream in) throws IOException { parseResponse(in, new ResponseParser() { public void parseResponse(XmlPullParser parser) throws XmlPullParserException, IOException { result[0] = parseMusic(parser, music); } }, mSavedImportType); } }); } catch (IOException e) { android.util.Log.e(LOG_TAG, "Could not find " + mSavedImportType + " item with ID " + id); } if (TextUtilities.isEmpty(music.mEan) && id.length() == 13) { music.mEan = id; } else if (TextUtilities.isEmpty(music.mIsbn) && id.length() == 10) { music.mIsbn = id; } return result[0] ? music : null; } /** * Searchs for music that match the provided query. * * @param query * The free form query used to search for music. * * @return A list of Music instances if query was successful or null * otherwise. */ public ArrayList<Music> searchMusic(String query, String page, final MusicSearchListener listener, Context context) { final Uri.Builder uri = buildSearchQuery(query, VALUE_SEARCHINDEX_MUSIC, page, context); final HttpGet get = new HttpGet(uri.build().toString()); final ArrayList<Music> music = new ArrayList<Music>(10); try { executeRequest(new HttpHost(mHost, 80, "http"), get, new ResponseHandler() { public void handleResponse(InputStream in) throws IOException { parseResponse(in, new ResponseParser() { public void parseResponse(XmlPullParser parser) throws XmlPullParserException, IOException { parseMusic(parser, music, listener); } }, null); } }); return music; } catch (IOException e) { android.util.Log.e(LOG_TAG, "Could not perform search with query: " + query, e); } return null; } /** * Parses a music from the XML input stream. * * @param parser * The XML parser to use to parse the music. * @param music * The music object to put the parsed data in. * * @return True if the music could correctly be parsed, false otherwise. */ boolean parseMusic(XmlPullParser parser, Music music) throws XmlPullParserException, IOException { int type; String name; int number = 0; final int depth = parser.getDepth(); while (((type = parser.next()) != XmlPullParser.END_TAG || parser.getDepth() > depth) && type != XmlPullParser.END_DOCUMENT) { if (type != XmlPullParser.START_TAG) { continue; } name = parser.getName(); if (RESPONSE_TAG_ASIN.equals(name)) { if (parser.next() == XmlPullParser.TEXT) { // GJT: Fixes issues with // <SimilarProduct><ASIN/><SimilarProduct>--gets an // additional, incorrect ASIN ! if (music.mInternalId == null) music.mInternalId = parser.getText(); } } else if (RESPONSE_TAG_DETAILPAGEURL.equals(name)) { if (parser.next() == XmlPullParser.TEXT) { music.mDetailsUrl = parser.getText(); } } else if (RESPONSE_TAG_IMAGESET.equals(name)) { if (RESPONSE_VALUE_CATEGORY_PRIMARY .equals(parser.getAttributeValue(null, RESPONSE_ATTR_CATEGORY))) { parseImageSet(parser, music); } else if (Music.mImages.get(ImageSize.THUMBNAIL) == null && RESPONSE_VALUE_CATEGORY_VARIANT .equals(parser.getAttributeValue(null, RESPONSE_ATTR_CATEGORY))) { parseImageSet(parser, music); } } else if (RESPONSE_TAG_ITEMATTRIBUTES.equals(name)) { parseItemAttributes(parser, music); } else if (RESPONSE_TAG_LOWESTUSEDPRICE.equals(name)) { parsePrices(parser, music); } else if (RESPONSE_TAG_EDITORIALREVIEW.equals(name)) { music.mDescriptions.add(parseEditorialReview(parser)); } else if (RESPONSE_TAG_DISC.equals(name)) { music.mTracks.add("Disc " + ++number + "|"); parseTracks(parser, music); } else if (RESPONSE_TAG_ERRORS.equals(name)) { return false; } } return true; } /** * Creates an instance of * {@link biz.varkon.shelvesom.provider.music.MusicStore.Music} with this * music store's name. * * @return A new instance of Music. */ Music createMusic() { return new Music(); } private void parseMusic(XmlPullParser parser, ArrayList<Music> musics, MusicSearchListener listener) throws IOException, XmlPullParserException { int type; while ((type = parser.next()) != XmlPullParser.END_TAG && type != XmlPullParser.END_DOCUMENT) { if (type != XmlPullParser.START_TAG) { continue; } if (findNextItem(parser)) { final Music music = createMusic(); if (parseMusic(parser, music)) { musics.add(music); listener.onMusicFound(music, musics); } } } } private void parseTracks(XmlPullParser parser, Music music) throws XmlPullParserException, IOException { int number = 0; int type; String tag; final int depth = parser.getDepth(); while (((type = parser.next()) != XmlPullParser.END_TAG || parser.getDepth() > depth) && type != XmlPullParser.END_DOCUMENT) { if (type != XmlPullParser.START_TAG) { continue; } tag = parser.getName(); if (RESPONSE_TAG_TRACK.equals(tag)) { parser.next(); music.mTracks.add("#" + ++number + ": " + parser.getText()); } } music.mTracks.add("||"); } /** * Interface used to load images with an expiring date. The expiring date is * handled by the image cache to check for updated images from time to time. */ static interface ImageLoader { /** * Load the specified as a Bitmap and associates an expiring date to it. * * @param url * The URL of the image to load. * * @return The Bitmap decoded from the URL and an expiration date. */ public ImageUtilities.ExpiringBitmap load(String url); } /** * Listener invoked by * {@link biz.varkon.shelvesom.provider.music.MusicStore#searchMusic(String, biz.varkon.shelvesom.provider.music.MusicStore.MusicSearchListener)} * . */ public static interface MusicSearchListener { /** * Invoked whenever a music was found by the search operation. * * @param music * The music yield by the search query. * @param music * The music found so far, including <code>music</code>. */ void onMusicFound(Music music, ArrayList<Music> musics); } private void parseItemAttributes(XmlPullParser parser, Music music) throws IOException, XmlPullParserException { int type; String name; final int depth = parser.getDepth(); while (((type = parser.next()) != XmlPullParser.END_TAG || parser.getDepth() > depth) && type != XmlPullParser.END_DOCUMENT) { if (type != XmlPullParser.START_TAG) { continue; } name = parser.getName(); if (RESPONSE_TAG_ARTIST.equals(name)) { if (parser.next() == XmlPullParser.TEXT) { music.mAuthors.add(parser.getText()); } } else if (RESPONSE_TAG_EAN.equals(name)) { if (parser.next() == XmlPullParser.TEXT) { music.mEan = parser.getText(); } } else if (RESPONSE_TAG_ISBN.equals(name)) { if (parser.next() == XmlPullParser.TEXT) { music.mIsbn = parser.getText(); } } else if (RESPONSE_TAG_UPC.equals(name)) { if (parser.next() == XmlPullParser.TEXT) { music.mUpc = parser.getText(); } } else if (RESPONSE_TAG_BINDING.equals(name)) { if (parser.next() == XmlPullParser.TEXT) { music.mFormat = parser.getText(); } } else if (RESPONSE_TAG_ORIGINALRELEASEDATE.equals(name)) { if (parser.next() == XmlPullParser.TEXT) { final SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd"); try { music.mReleaseDate = format.parse(parser.getText()); } catch (ParseException e) { // Ignore } } } else if (RESPONSE_TAG_TITLE.equals(name)) { if (parser.next() == XmlPullParser.TEXT) { music.mTitle = parser.getText(); } } else if (RESPONSE_TAG_LABEL.equals(name)) { if (parser.next() == XmlPullParser.TEXT) { music.mLabel = parser.getText(); } } } } private void parsePrices(XmlPullParser parser, Music music) throws IOException, XmlPullParserException { int type; String name; final int depth = parser.getDepth(); while (((type = parser.next()) != XmlPullParser.END_TAG || parser.getDepth() > depth) && type != XmlPullParser.END_DOCUMENT) { if (type != XmlPullParser.START_TAG) { continue; } name = parser.getName(); if (RESPONSE_TAG_FORMATTEDPRICE.equals(name)) { if (parser.next() == XmlPullParser.TEXT) { String price = parser.getText(); try { if (music.mRetailPrice == null || (music.mRetailPrice != null && Double .valueOf(music.mRetailPrice.substring(1)) > Double.valueOf(price.substring(1)))) { music.mRetailPrice = price; } } catch (NumberFormatException n) { Log.e(LOG_TAG, n.toString()); if (music.mRetailPrice == null) music.mRetailPrice = ""; } } } } } private void parseImageSet(XmlPullParser parser, Music music) throws IOException, XmlPullParserException { int type; String name; final int depth = parser.getDepth(); while (((type = parser.next()) != XmlPullParser.END_TAG || parser.getDepth() > depth) && type != XmlPullParser.END_DOCUMENT) { if (type != XmlPullParser.START_TAG) { continue; } name = parser.getName(); if (RESPONSE_TAG_TINYIMAGE.equals(name)) { Music.mImages.put(ImageSize.TINY, parseImage(parser)); } else if (RESPONSE_TAG_THUMBNAILIMAGE.equals(name)) { Music.mImages.put(ImageSize.THUMBNAIL, parseImage(parser)); } else if (RESPONSE_TAG_MEDIUMIMAGE.equals(name)) { Music.mImages.put(ImageSize.MEDIUM, parseImage(parser)); } else if (RESPONSE_TAG_LARGEIMAGE.equals(name)) { Music.mImages.put(ImageSize.LARGE, parseImage(parser)); } } } }