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/* * Copyright (C) 2012 The Android Open Source Project *// w w w.j a v a2 s . c o m * 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.example.android.threadsample; import org.xml.sax.helpers.DefaultHandler; import org.xmlpull.v1.XmlPullParser; import org.xmlpull.v1.XmlPullParserException; import org.xmlpull.v1.XmlPullParserFactory; import android.content.ContentValues; import android.net.Uri; import java.io.IOException; import java.io.InputStream; import java.util.Vector; /** * RSSPullParser reads an RSS feed from the Picasa featured pictures site. It uses * several packages from the widely-known XMLPull API. * */ public class RSSPullParser extends DefaultHandler { // Global constants // An attribute value indicating that the element contains media content private static final String CONTENT = "media:content"; // An attribute value indicating that the element contains a thumbnail private static final String THUMBNAIL = "media:thumbnail"; // An attribute value indicating that the element contains an item private static final String ITEM = "item"; // Sets the initial size of the vector that stores data. private static final int VECTOR_INITIAL_SIZE = 500; // Storage for a single ContentValues for image data private static ContentValues mImage; // A vector that will contain all of the images private Vector<ContentValues> mImages; /** * A getter that returns the image data Vector * @return A Vector containing all of the image data retrieved by the parser */ public Vector<ContentValues> getImages() { return mImages; } /** * This method parses XML in an input stream and stores parts of the data in memory * * @param inputStream a stream of data containing XML elements, usually a RSS feed * @param progressNotifier a helper class for sending status and logs * @throws XmlPullParserException defined by XMLPullParser; thrown if the thread is cancelled. * @throws IOException thrown if an IO error occurs during parsing */ public void parseXml(InputStream inputStream, BroadcastNotifier progressNotifier) throws XmlPullParserException, IOException { // Instantiates a parser factory XmlPullParserFactory localXmlPullParserFactory = XmlPullParserFactory .newInstance(); // Turns off namespace handling for the XML input localXmlPullParserFactory.setNamespaceAware(false); // Instantiates a new pull parser XmlPullParser localXmlPullParser = localXmlPullParserFactory .newPullParser(); // Sets the parser's input stream localXmlPullParser.setInput(inputStream, null); // Gets the first event in the input sream int eventType = localXmlPullParser.getEventType(); // Sets the number of images read to 1 int imageCount = 1; // Returns if the current event (state) is not START_DOCUMENT if (eventType != XmlPullParser.START_DOCUMENT) { throw new XmlPullParserException("Invalid RSS"); } // Creates a new store for image URL data mImages = new Vector<ContentValues>(VECTOR_INITIAL_SIZE); // Loops indefinitely. The exit occurs if there are no more URLs to process while (true) { // Gets the next event in the input stream int nextEvent = localXmlPullParser.next(); // If the current thread is interrupted, throws an exception and returns if (Thread.currentThread().isInterrupted()) { throw new XmlPullParserException("Cancelled"); // At the end of the feed, exits the loop } else if (nextEvent == XmlPullParser.END_DOCUMENT) { break; // At the beginning of the feed, skips the event and continues } else if (nextEvent == XmlPullParser.START_DOCUMENT) { continue; // At the start of a tag, gets the tag's name } else if (nextEvent == XmlPullParser.START_TAG) { String eventName = localXmlPullParser.getName(); /* * If this is the start of an individual item, logs it and creates a new * ContentValues */ if (eventName.equalsIgnoreCase(ITEM)) { mImage = new ContentValues(); // If this isn't an item, then checks for other options } else { // Defines keys to store the column names String imageUrlKey; String imageNameKey; // Defines a place to store the filename of a URL, String fileName; // If it's CONTENT if (eventName.equalsIgnoreCase(CONTENT)) { // Stores the image URL and image name column names as keys imageUrlKey = DataProviderContract.IMAGE_URL_COLUMN; imageNameKey = DataProviderContract.IMAGE_PICTURENAME_COLUMN; // If it's a THUMBNAIL } else if (eventName.equalsIgnoreCase(THUMBNAIL)) { // Stores the thumbnail URL and thumbnail name column names as keys imageUrlKey = DataProviderContract.IMAGE_THUMBURL_COLUMN; imageNameKey = DataProviderContract.IMAGE_THUMBNAME_COLUMN; // Otherwise it's some other event that isn't important } else { continue; } // It's not an ITEM. Gets the URL attribute from the event String urlValue = localXmlPullParser.getAttributeValue(null, "url"); // If the value is null, exits if (urlValue == null) break; // Puts the URL and the key into the ContentValues mImage.put(imageUrlKey, urlValue); // Gets the filename of the URL and puts it into the ContentValues fileName = Uri.parse(urlValue).getLastPathSegment(); mImage.put(imageNameKey, fileName); } } /* * If it's not an ITEM, and it is an END_TAG, and the current event is an ITEM, and * there is data in the current ContentValues */ else if ((nextEvent == XmlPullParser.END_TAG) && (localXmlPullParser.getName().equalsIgnoreCase(ITEM)) && (mImage != null)) { // Adds the current ContentValues to the ContentValues storage mImages.add(mImage); // Logs progress progressNotifier.notifyProgress("Parsed Image[" + imageCount + "]:" + mImage.getAsString(DataProviderContract.IMAGE_URL_COLUMN)); // Clears out the current ContentValues mImage = null; // Increments the count of the number of images stored. imageCount++; } } } }