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.gadgets; 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 gadgets from a gadgets store. */ public class GadgetsStore extends ServerInfo { static final String LOG_TAG = "GadgetsStore"; public static class Gadget extends BaseItem implements Parcelable, BaseColumns { public static final Uri CONTENT_URI = Uri.parse("content://GadgetsProvider/gadgets"); String mAuthors; List<Description> mDescriptions; private ServerImageLoader mLoader; 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); } Gadget() { mStorePrefix = ServerInfo.NAME; mLoader = new ServerImageLoader(); mImages = new HashMap<ImageSize, String>(6); mDescriptions = new ArrayList<Description>(); mTags = new ArrayList<String>(1); mLanguage = new ArrayList<String>(1); mFeatures = new ArrayList<String>(1); } private Gadget(Parcel in) { mIsbn = in.readString(); mEan = in.readString(); mInternalId = in.readString(); mTitle = in.readString(); mTags = new ArrayList<String>(1); } public String getAuthors() { return mAuthors; } public List<Description> getDescriptions() { return mDescriptions; } @Override public Bitmap loadCover(ImageSize size) { String url = mImages.get(size); if (TextUtilities.isEmpty(url)) { url = mImages.get(ImageSize.MEDIUM); 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, mAuthors); values.put(LABEL, mLabel); values.put(REVIEWS, TextUtilities.join(mDescriptions, "\n\n")); if (mLastModified != null) { values.put(LAST_MODIFIED, mLastModified.getTimeInMillis()); } 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(FEATURES, TextUtilities.join(mFeatures, ", ")); 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(NOTES, mNotes); values.put(QUANTITY, mQuantity); return values; } public static Gadget fromCursor(Cursor c) { final Gadget gadget = new Gadget(); gadget.mInternalId = c.getString(c.getColumnIndexOrThrow(INTERNAL_ID)) .substring(ServerInfo.NAME.length()); gadget.mEan = c.getString(c.getColumnIndexOrThrow(EAN)); gadget.mIsbn = c.getString(c.getColumnIndexOrThrow(ISBN)); gadget.mUpc = c.getString(c.getColumnIndexOrThrow(UPC)); gadget.mTitle = c.getString(c.getColumnIndexOrThrow(TITLE)); gadget.mAuthors = c.getString(c.getColumnIndexOrThrow(AUTHORS)); gadget.mLabel = c.getString(c.getColumnIndexOrThrow(LABEL)); gadget.mDescriptions.add(new Description("", c.getString(c.getColumnIndexOrThrow(REVIEWS)))); final Calendar calendar = Calendar.getInstance(); calendar.setTimeInMillis(c.getLong(c.getColumnIndexOrThrow(LAST_MODIFIED))); gadget.mLastModified = calendar; try { Collections.addAll(gadget.mTags, c.getString(c.getColumnIndexOrThrow(TAGS)).split(", ")); } catch (Exception e) { // GJT: Ignore, probably null } gadget.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: Gadget.mImages.put(ImageSize.LARGE, tiny_url); Gadget.mImages.put(ImageSize.THUMBNAIL, tiny_url.replace("zoom=1", "zoom=5")); break; case 240: Gadget.mImages.put(ImageSize.MEDIUM, tiny_url); Gadget.mImages.put(ImageSize.THUMBNAIL, tiny_url.replace("zoom=1", "zoom=5")); break; case 120: Gadget.mImages.put(ImageSize.THUMBNAIL, tiny_url); Gadget.mImages.put(ImageSize.THUMBNAIL, tiny_url); break; case 160: default: Gadget.mImages.put(ImageSize.TINY, tiny_url); Gadget.mImages.put(ImageSize.THUMBNAIL, tiny_url.replace("zoom=1", "zoom=5")); break; } } // GJT: Added these for more details try { Collections.addAll(gadget.mFeatures, c.getString(c.getColumnIndexOrThrow(FEATURES)).split(", ")); } catch (Exception e) { // GJT: Ignore, probably null } gadget.mRetailPrice = c.getString(c.getColumnIndexOrThrow(RETAIL_PRICE)); gadget.mRating = c.getInt(c.getColumnIndexOrThrow(RATING)); gadget.mLoanedTo = c.getString(c.getColumnIndex(LOANED_TO)); String loanDate = c.getString(c.getColumnIndexOrThrow(LOAN_DATE)); if (loanDate != null) { try { gadget.mLoanDate = Preferences.getDateFormat().parse(loanDate); } catch (ParseException e) { // Ignore } } String wishlistDate = c.getString(c.getColumnIndexOrThrow(WISHLIST_DATE)); if (wishlistDate != null) { try { gadget.mWishlistDate = Preferences.getDateFormat().parse(wishlistDate); } catch (ParseException e) { // Ignore } } gadget.mEventId = c.getInt(c.getColumnIndexOrThrow(EVENT_ID)); gadget.mNotes = c.getString(c.getColumnIndexOrThrow(NOTES)); gadget.mQuantity = c.getString(c.getColumnIndex(QUANTITY)); return gadget; } @Override public String toString() { return "Gadget[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.writeString(mAuthors); dest.writeStringList(mTags); } public static final Creator<Gadget> CREATOR = new Creator<Gadget>() { public Gadget createFromParcel(Parcel in) { return new Gadget(in); } public Gadget[] newArray(int size) { return new Gadget[size]; } }; } /** * Finds the gadget with the specified id. * * @param id * The id of the gadget to find (ISBN-10, ISBN-13, etc.) * @param mSavedImportType * * @return A Gadget instance if the gadget was found or null otherwise. */ public Gadget findGadget(String id, final IOUtilities.inputTypes mSavedImportType, Context context) { Uri.Builder uri = assembleURI(id, mSavedImportType, context, VALUE_SEARCHINDEX_GADGETS, RESPONSE_TAG_EAN); 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; default: android.util.Log.i(LOG_TAG, "Looking up ID: " + id); break; } HttpGet get = new HttpGet(uri.build().toString()); Gadget gadget = createGadget(); gadget = findGadgetLookup(get, gadget, mSavedImportType, id); if (gadget != null) { return gadget; } gadget = createGadget(); uri = buildFindQuery(id, VALUE_SEARCHINDEX_GADGETS, context, RESPONSE_TAG_ASIN); get = new HttpGet(uri.build().toString()); gadget = findGadgetLookup(get, gadget, mSavedImportType, id); if (gadget != null) { return gadget; } gadget = createGadget(); uri = buildFindQuery(id, VALUE_SEARCHINDEX_GADGETS, context, RESPONSE_TAG_UPC); get = new HttpGet(uri.build().toString()); gadget = findGadgetLookup(get, gadget, mSavedImportType, id); if (gadget != null) { return gadget; } else { return null; } } private Gadget findGadgetLookup(HttpGet get, final Gadget gadget, 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] = parseGadget(parser, gadget); } }, mSavedImportType); } }); } catch (IOException e) { android.util.Log.e(LOG_TAG, "Could not find " + mSavedImportType + " item with ID " + id); } if (TextUtilities.isEmpty(gadget.mEan) && id.length() == 13) { gadget.mEan = id; } else if (TextUtilities.isEmpty(gadget.mIsbn) && id.length() == 10) { gadget.mIsbn = id; } return result[0] ? gadget : null; } /** * Searchs for gadgets that match the provided query. * * @param query * The free form query used to search for gadgets. * * @return A list of Gadget instances if query was successful or null * otherwise. */ public ArrayList<Gadget> searchGadgets(String query, String page, final GadgetSearchListener listener, Context context) { final Uri.Builder uri = buildSearchQuery(query, VALUE_SEARCHINDEX_GADGETS, page, context); final HttpGet get = new HttpGet(uri.build().toString()); final ArrayList<Gadget> gadgets = new ArrayList<Gadget>(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 { parseGadgets(parser, gadgets, listener); } }, null); } }); return gadgets; } catch (IOException e) { android.util.Log.e(LOG_TAG, "Could not perform search with query: " + query, e); } return null; } /** * Parses a gadget from the XML input stream. * * @param parser * The XML parser to use to parse the gadget. * @param gadget * The gadget object to put the parsed data in. * * @return True if the gadget could correctly be parsed, false otherwise. */ boolean parseGadget(XmlPullParser parser, Gadget gadget) throws XmlPullParserException, IOException { 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_ASIN.equals(name)) { if (parser.next() == XmlPullParser.TEXT) { // GJT: Fixes issues with // <SimilarProduct><ASIN/><SimilarProduct>--gets an // additional, incorrect ASIN ! if (gadget.mInternalId == null) gadget.mInternalId = parser.getText(); } } else if (RESPONSE_TAG_DETAILPAGEURL.equals(name)) { if (parser.next() == XmlPullParser.TEXT) { gadget.mDetailsUrl = parser.getText(); } } else if (RESPONSE_TAG_IMAGESET.equals(name)) { if (RESPONSE_VALUE_CATEGORY_PRIMARY .equals(parser.getAttributeValue(null, RESPONSE_ATTR_CATEGORY))) { parseImageSet(parser, gadget); } else if (Gadget.mImages.get(ImageSize.THUMBNAIL) == null && RESPONSE_VALUE_CATEGORY_VARIANT .equals(parser.getAttributeValue(null, RESPONSE_ATTR_CATEGORY))) { parseImageSet(parser, gadget); } } else if (RESPONSE_TAG_ITEMATTRIBUTES.equals(name)) { parseItemAttributes(parser, gadget); } else if (RESPONSE_TAG_LOWESTUSEDPRICE.equals(name)) { parsePrices(parser, gadget); } else if (RESPONSE_TAG_EDITORIALREVIEW.equals(name)) { gadget.mDescriptions.add(parseEditorialReview(parser)); } else if (RESPONSE_TAG_ERRORS.equals(name)) { return false; } } return true; } /** * Creates an instance of * {@link biz.varkon.shelvesom.provider.gadgets.GadgetsStore.Gadget} with * this gadget store's name. * * @return A new instance of Gadget. */ Gadget createGadget() { return new Gadget(); } private void parseGadgets(XmlPullParser parser, ArrayList<Gadget> gadgets, GadgetSearchListener 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 Gadget gadget = createGadget(); if (parseGadget(parser, gadget)) { gadgets.add(gadget); listener.onGadgetFound(gadget, gadgets); } } } } /** * 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.gadgets.GadgetsStore#searchGadgets(String, biz.varkon.shelvesom.provider.gadgets.GadgetsStore.GadgetSearchListener)} * . */ public static interface GadgetSearchListener { /** * Invoked whenever a gadget was found by the search operation. * * @param gadget * The gadget yield by the search query. * @param gadgets * The gadgets found so far, including <code>gadget</code>. */ void onGadgetFound(Gadget gadget, ArrayList<Gadget> gadgets); } private void parseItemAttributes(XmlPullParser parser, Gadget gadget) 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_MANUFACTURER.equals(name)) { if (parser.next() == XmlPullParser.TEXT) { gadget.mAuthors = parser.getText(); } } else if (RESPONSE_TAG_EAN.equals(name)) { if (parser.next() == XmlPullParser.TEXT) { gadget.mEan = parser.getText(); } } else if (RESPONSE_TAG_ISBN.equals(name)) { if (parser.next() == XmlPullParser.TEXT) { gadget.mIsbn = parser.getText(); } } else if (RESPONSE_TAG_UPC.equals(name)) { if (parser.next() == XmlPullParser.TEXT) { gadget.mUpc = parser.getText(); } } else if (RESPONSE_TAG_BINDING.equals(name)) { if (parser.next() == XmlPullParser.TEXT) { gadget.mFormat = parser.getText(); } } else if (RESPONSE_TAG_FEATURE.equals(name)) { if (parser.next() == XmlPullParser.TEXT) { gadget.mFeatures.add(parser.getText()); } } else if (RESPONSE_TAG_RELEASEDATE.equals(name)) { if (parser.next() == XmlPullParser.TEXT) { final SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd"); try { gadget.mReleaseDate = format.parse(parser.getText()); } catch (ParseException e) { // Ignore } } } else if (RESPONSE_TAG_TITLE.equals(name)) { if (parser.next() == XmlPullParser.TEXT) { gadget.mTitle = parser.getText(); } } else if (RESPONSE_TAG_LABEL.equals(name)) { if (parser.next() == XmlPullParser.TEXT) { gadget.mLabel = parser.getText(); } } } } private void parsePrices(XmlPullParser parser, Gadget gadget) 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 (gadget.mRetailPrice == null || (gadget.mRetailPrice != null && Double .valueOf(gadget.mRetailPrice.substring(1)) > Double.valueOf(price.substring(1)))) { gadget.mRetailPrice = price; } } catch (NumberFormatException n) { Log.e(LOG_TAG, n.toString()); if (gadget.mRetailPrice == null) gadget.mRetailPrice = ""; } } } } } private void parseImageSet(XmlPullParser parser, Gadget gadget) 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)) { Gadget.mImages.put(ImageSize.TINY, parseImage(parser)); } else if (RESPONSE_TAG_THUMBNAILIMAGE.equals(name)) { Gadget.mImages.put(ImageSize.THUMBNAIL, parseImage(parser)); } else if (RESPONSE_TAG_MEDIUMIMAGE.equals(name)) { Gadget.mImages.put(ImageSize.MEDIUM, parseImage(parser)); } else if (RESPONSE_TAG_LARGEIMAGE.equals(name)) { Gadget.mImages.put(ImageSize.LARGE, parseImage(parser)); } } } }