Initial verse lookup and caching.

Having some weird issues on the build, syncing to Github so I can test elsewhere. Things are likely broken right now.

app/build.gradle

@@ -55,20 +55,19 @@ android {
 dependencies {
     compile project(path: ':jsword-minimalbible', configuration: 'buildJSword')
 
-    compile 'com.squareup.dagger:dagger:1.2.1'
-    provided 'com.squareup.dagger:dagger-compiler:1.2.1'
+    compile 'com.squareup.dagger:dagger:+'
+    provided 'com.squareup.dagger:dagger-compiler:+'
 
-    provided 'de.devland.esperandro:esperandro:1.1.2'
+    compile 'de.devland.esperandro:esperandro-api:+'
+    provided 'de.devland.esperandro:esperandro:+'
+
+    compile 'com.jakewharton:butterknife:+'
+    compile 'com.readystatesoftware.systembartint:systembartint:+'
+    compile 'com.netflix.rxjava:rxjava-android:+'
+    compile 'com.android.support:appcompat-v7:20.+'
 
     androidTestCompile 'com.jayway.awaitility:awaitility:1.6.0'
     androidTestCompile 'org.mockito:mockito-core:+'
     androidTestCompile 'com.google.dexmaker:dexmaker:+'
     androidTestCompile 'com.google.dexmaker:dexmaker-mockito:+'
-    // androidTestProvided 'com.squareup.dagger:dagger-compiler:1.2.0'
-
-    compile 'com.jakewharton:butterknife:5.0.1'
-    compile 'de.devland.esperandro:esperandro-api:1.1.2'
-    compile 'com.readystatesoftware.systembartint:systembartint:1.0.3'
-    compile 'com.netflix.rxjava:rxjava-android:0.19.0'
-    compile 'com.android.support:appcompat-v7:20.+'
 }

app/src/main/AndroidManifest.xml

@@ -3,17 +3,16 @@
     package="org.bspeice.minimalbible">
 
     <application
+        android:name=".MinimalBible"
         android:allowBackup="true"
         android:icon="@drawable/ic_launcher"
         android:label="@string/app_name"
-        android:theme="@style/AppTheme"
-        android:name=".MinimalBible" >
+        android:theme="@style/AppTheme">
         <activity
             android:name=".activity.downloader.DownloadActivity"
-            android:label="@string/app_name" >
-        </activity>
-
-        <activity android:name=".activity.viewer.BibleViewer"
+            android:label="@string/app_name"></activity>
+        <activity
+            android:name=".activity.viewer.BibleViewer"
             android:label="@string/app_name">
             <intent-filter>
             <action android:name="android.intent.action.MAIN" />

app/src/main/java/org/bspeice/minimalbible/activity/viewer/BookFragment.java

@@ -12,9 +12,11 @@ import android.webkit.WebViewClient;
 import org.bspeice.minimalbible.Injector;
 import org.bspeice.minimalbible.R;
 import org.bspeice.minimalbible.activity.BaseFragment;
+import org.bspeice.minimalbible.activity.viewer.bookutil.VersificationUtil;
+import org.bspeice.minimalbible.service.book.VerseLookupService;
 import org.crosswire.jsword.book.Book;
-import org.crosswire.jsword.book.BookMetaData;
-import org.crosswire.jsword.versification.Versification;
+import org.crosswire.jsword.passage.Verse;
+import org.crosswire.jsword.versification.BibleBook;
 
 import java.util.List;
 
@@ -23,22 +25,31 @@ import javax.inject.Named;
 
 import butterknife.ButterKnife;
 import butterknife.InjectView;
+import dagger.Lazy;
 
-import static org.crosswire.jsword.versification.system.Versifications.instance;
+import static org.bspeice.minimalbible.util.StringUtil.joinString;
 
 /**
  * A placeholder fragment containing a simple view.
  */
 public class BookFragment extends BaseFragment {
-    @Inject @Named("MainBook") Book mBook;
 
+    private static final String ARG_BOOK_NAME = "book_name";
+    @Inject
+    @Named("MainBook")
+    Lazy<Book> mBook;
+    @Inject
+    VersificationUtil vUtil;
+    // TODO: Factory?
+    VerseLookupService lookupService;
     @InjectView(R.id.book_content)
     WebView mainContent;
 
-    private static final String ARG_BOOK_NAME = "book_name";
+    public BookFragment() {
+    }
 
     /**
-     * Returns a new instance of this fragment for the given section number.
+     * Returns a new instance of this fragment for the given book.
      */
     public static BookFragment newInstance(String bookName) {
         BookFragment fragment = new BookFragment();
@@ -48,9 +59,6 @@ public class BookFragment extends BaseFragment {
         return fragment;
     }
 
-    public BookFragment() {
-    }
-
     @Override
     public void onCreate(Bundle state) {
         super.onCreate(state);
@@ -63,28 +71,35 @@ public class BookFragment extends BaseFragment {
         View rootView = inflater.inflate(R.layout.fragment_viewer_main, container,
                 false);
         ((Injector)getActivity()).inject(this);
+        // TODO: Defer lookup until after webview created? When exactly is WebView created?
+        this.lookupService = new VerseLookupService(mBook.get(), this.getActivity());
         ButterKnife.inject(this, rootView);
         mainContent.getSettings().setJavaScriptEnabled(true);
 
-        // TODO: Load initial text from SharedPreferences
+        // TODO: Load initial text from SharedPreferences, rather than getting the actual book.
 
-        displayBook(mBook);
-
-        Log.d("BookFragment", getVersification(mBook).toString());
+        displayBook(mBook.get());
 
         return rootView;
     }
 
-    private Versification getVersification(Book b) {
-        return instance().getVersification((String) b.getBookMetaData().getProperty(BookMetaData.KEY_VERSIFICATION));
-    }
-
     // TODO: Remove?
     @Override
     public void onAttach(Activity activity) {
         super.onAttach(activity);
     }
 
+    /*----------------------------------------
+        Here be all the methods you want to spend time with
+      ----------------------------------------
+     */
+
+    /**
+     * Do the initial work of displaying a book. Requires setting up WebView, etc.
+     * TODO: Get initial content from cache?
+     *
+     * @param b
+     */
     private void displayBook(Book b) {
         Log.d("BookFragment", b.getName());
         ((BibleViewer)getActivity()).setActionBarTitle(b.getInitials());
@@ -92,13 +107,30 @@ public class BookFragment extends BaseFragment {
         mainContent.setWebViewClient(new WebViewClient(){
             @Override
             public void onPageFinished(WebView view, String url) {
+                // TODO: Restore this verse from a SharedPref
+                Verse initial = new Verse(vUtil.getVersification(mBook.get()),
+                        BibleBook.GEN, 1, 1);
                 super.onPageFinished(view, url);
-                invokeJavascript("set_content", BookFragment.this.mBook.getName());
+                invokeJavascript("set_content", lookupService.getHTMLVerse(initial));
             }
         });
-
     }
 
+    /**
+     * Do the heavy listing of getting the actual text for a verse
+     *
+     * @param v
+     */
+    public void displayVerse(Verse v) {
+        Book b = mBook.get();
+        lookupService.getHTMLVerse(v);
+    }
+
+    /*-----------------------------------------
+        Here be the methods you wish didn't have to exist.
+      -----------------------------------------
+     */
+
     private void invokeJavascript(String function, Object arg) {
         mainContent.loadUrl("javascript:" + function + "('" + arg.toString() + "')");
     }
@@ -106,20 +138,4 @@ public class BookFragment extends BaseFragment {
     private void invokeJavascript(String function, List<Object> args) {
         mainContent.loadUrl("javascript:" + function + "(" + joinString(",", args.toArray()) + ")");
     }
-
-    // Convenience from http://stackoverflow.com/a/17795110/1454178
-    public static String joinString(String join, Object... strings) {
-        if (strings == null || strings.length == 0) {
-            return "";
-        } else if (strings.length == 1) {
-            return strings[0].toString();
-        } else {
-            StringBuilder sb = new StringBuilder();
-            sb.append(strings[0]);
-            for (int i = 1; i < strings.length; i++) {
-                sb.append(join).append(strings[i].toString());
-            }
-            return sb.toString();
-        }
-    }
 }

app/src/main/java/org/bspeice/minimalbible/activity/viewer/BookManager.java

@@ -22,6 +22,7 @@ public class BookManager {
 
     @Inject
     BookManager() {
+        // TODO:  Any way this can be sped up goes straight to the initialization time.
         installedBooks = Observable.from(Books.installed().getBooks())
             .cache();
         installedBooks.subscribeOn(Schedulers.io())
@@ -46,5 +47,4 @@ public class BookManager {
     public Boolean isRefreshComplete() {
         return refreshComplete;
     }
-
 }

app/src/main/java/org/bspeice/minimalbible/service/book/VerseLookupService.java

@@ -0,0 +1,155 @@
+package org.bspeice.minimalbible.service.book;
+
+import android.content.Context;
+import android.support.v4.util.LruCache;
+
+import org.crosswire.common.xml.Converter;
+import org.crosswire.common.xml.TransformingSAXEventProvider;
+import org.crosswire.common.xml.XMLUtil;
+import org.crosswire.jsword.book.Book;
+import org.crosswire.jsword.book.BookData;
+import org.crosswire.jsword.book.BookException;
+import org.crosswire.jsword.book.BookMetaData;
+import org.crosswire.jsword.passage.Verse;
+import org.crosswire.jsword.util.ConverterFactory;
+import org.xml.sax.SAXException;
+
+import javax.xml.transform.TransformerException;
+
+import rx.functions.Action1;
+import rx.schedulers.Schedulers;
+import rx.subjects.PublishSubject;
+
+/**
+ * This class has a simple purpose, but implements the dirty work needed to make it happen.
+ * The idea is this: someone wants the text for a verse, we look it up quickly.
+ * This means aggressive caching, cache prediction, and classes letting us know that some verses
+ * may be needed in the future (i.e. searching).
+ * <p/>
+ * There is one VerseLookupService per Book, but multiple VerseLookupServices can work with
+ * the same book. Because the actual caching mechanism is disk-based, we're safe.
+ * <p/>
+ * TODO: Statistics on cache hits/misses vs. verses cached
+ */
+public class VerseLookupService implements Action1<Verse> {
+
+    private static final int MAX_SIZE = 1000000; // 1MB
+    Book book;
+    LruCache<String, String> cache;
+    /**
+     * The listener is responsible for delegating calls to cache verses.
+     * This way, @notifyVerse can just tell the listener what's what,
+     * and the listener can delegate to another thread.
+     */
+    private PublishSubject<Verse> listener = PublishSubject.create();
+
+    public VerseLookupService(Book b, Context ctx) {
+        listener.subscribeOn(Schedulers.io())
+                .subscribe(this);
+        this.book = b;
+        this.cache = new LruCache<String, String>(MAX_SIZE);
+    }
+
+    /**
+     * Get the text for a corresponding verse
+     * First, check the cache. If that doesn't exist, manually get the verse.
+     * In all cases, notify that we're looking up a verse so we can get the surrounding ones.
+     *
+     * @param v The verse to look up
+     * @return The HTML text for this verse (\<p\/>)
+     */
+    public String getHTMLVerse(Verse v) {
+        if (contains(v)) {
+            return cache.get(getEntryName(v));
+        } else {
+            // The awkward method calls below are so notifyVerse doesn't
+            // call the same doVerseLookup
+            String verseContent = doVerseLookup(v);
+            notifyVerse(v);
+            return verseContent;
+        }
+    }
+
+    /**
+     * Perform the ugly work of getting the actual data for a verse
+     */
+    public String doVerseLookup(Verse v) {
+        BookData bookData = new BookData(book, v);
+
+        String verseHTML = null;
+
+        try {
+            Converter styler = ConverterFactory.getConverter();
+            TransformingSAXEventProvider htmlsep = (TransformingSAXEventProvider)
+                    styler.convert(bookData.getSAXEventProvider());
+            BookMetaData bmd = book.getBookMetaData();
+            boolean direction = bmd.isLeftToRight();
+            htmlsep.setParameter("direction", direction ? "ltr" : "rtl");
+
+            verseHTML = XMLUtil.writeToString(htmlsep);
+        } catch (TransformerException e) {
+            e.printStackTrace();
+        } catch (BookException e) {
+            e.printStackTrace();
+        } catch (SAXException e) {
+            e.printStackTrace();
+        }
+
+        return verseHTML;
+    }
+
+    /**
+     * Not necessary, but helpful if you let us know ahead of time we should pre-cache a verse.
+     * For example, if something showed up in search results, it'd be helpful to start
+     * looking up some of the results.
+     *
+     * @param v The verse we should pre-cache
+     */
+    public void notifyVerse(Verse v) {
+        listener.onNext(v);
+    }
+
+    /**
+     * Let someone know if the cache contains a verse we want
+     * Also provides a nice wrapper if the underlying cache isn't working properly.
+     *
+     * @param v The verse to check
+     * @return Whether we can retrieve the verse from our cache
+     */
+    public boolean contains(Verse v) {
+        return cache.get(getEntryName(v)) != null;
+    }
+
+    /**
+     * Given a verse, what should it's name in the cache be?
+     * Example: Matthew 7:7 becomes:
+     * MAT_7_7
+     *
+     * @param v The verse we need to generate a name for
+     * @return The name this verse should have in the cache
+     */
+    private String getEntryName(Verse v) {
+        StringBuilder sb = new StringBuilder();
+        sb.append(v.getBook().toString() + "_");
+        sb.append(v.getChapter() + "_");
+        sb.append(v.getVerse());
+        return sb.toString();
+    }
+
+    /*------------------------------------------------------------------------
+        IO Thread operations below
+    ------------------------------------------------------------------------*/
+
+    /**
+     * The listener has let us know that we need to look up a verse. So, look up
+     * that one first, and get its surrounding verses as well just in case.
+     * We can safely assume we are not on the main thread.
+     *
+     * @param verse The verse we need to look up
+     */
+
+    @Override
+    public void call(Verse verse) {
+
+    }
+}

app/src/main/java/org/bspeice/minimalbible/util/StringUtil.java

@@ -0,0 +1,23 @@
+package org.bspeice.minimalbible.util;
+
+/**
+ * Created by bspeice on 8/3/14.
+ */
+public class StringUtil {
+
+    // Convenience from http://stackoverflow.com/a/17795110/1454178
+    public static String joinString(String join, Object... strings) {
+        if (strings == null || strings.length == 0) {
+            return "";
+        } else if (strings.length == 1) {
+            return strings[0].toString();
+        } else {
+            StringBuilder sb = new StringBuilder();
+            sb.append(strings[0]);
+            for (int i = 1; i < strings.length; i++) {
+                sb.append(join).append(strings[i].toString());
+            }
+            return sb.toString();
+        }
+    }
+}