Adds A Config Option To Provide a FontPath Substitution Map

calligraphy/src/main/java/uk/co/chrisjenx/calligraphy/CalligraphyConfig.java

@@ -1,5 +1,6 @@
 package uk.co.chrisjenx.calligraphy;
 
+import android.content.res.AssetManager;
 import android.os.Build;
 import android.text.TextUtils;
 import android.view.View;
@@ -71,6 +72,7 @@ private static void addAppCompatViews() {
      */
     public static void initDefault(CalligraphyConfig calligraphyConfig) {
         sInstance = calligraphyConfig;
+        TypefaceUtils.setFontPathSubstitutionMap(sInstance.getFontPathSubstitutionMap());
     }
 
     /**
@@ -116,6 +118,11 @@ public static CalligraphyConfig get() {
      * @see uk.co.chrisjenx.calligraphy.CalligraphyConfig.Builder#addCustomViewWithSetTypeface(Class)
      */
     private final Set<Class<?>> hasTypefaceViews;
+    /**
+     * A map of font paths that should be used to dynamically substitute a new fontPath for the
+     * fontPath that's specified in XML / passed to {@link TypefaceUtils#load(AssetManager, String)}
+     */
+    private Map<String, String> mFontPathSubstitutionMap = null;
 
     protected CalligraphyConfig(Builder builder) {
         mIsFontSet = builder.isFontSet;
@@ -128,6 +135,7 @@ protected CalligraphyConfig(Builder builder) {
         tempMap.putAll(builder.mStyleClassMap);
         mClassStyleAttributeMap = Collections.unmodifiableMap(tempMap);
         hasTypefaceViews = Collections.unmodifiableSet(builder.mHasTypefaceClasses);
+        mFontPathSubstitutionMap = builder.fontPathSubstitutionMap;
     }
 
     /**
@@ -171,6 +179,10 @@ public int getAttrId() {
         return mAttrId;
     }
 
+    public Map<String, String> getFontPathSubstitutionMap() {
+        return mFontPathSubstitutionMap;
+    }
+
     public static class Builder {
         /**
          * Default AttrID if not set.
@@ -207,6 +219,8 @@ public static class Builder {
 
         private Set<Class<?>> mHasTypefaceClasses = new HashSet<>();
 
+        private Map<String, String> fontPathSubstitutionMap = null;
+
         /**
          * This defaults to R.attr.fontPath. So only override if you want to use your own attrId.
          *
@@ -312,6 +326,11 @@ public Builder addCustomViewWithSetTypeface(Class<?> clazz) {
             return this;
         }
 
+        public Builder setFontPathSubstitutionMap(Map<String, String> fontPathSubstitutionMap) {
+            this.fontPathSubstitutionMap = fontPathSubstitutionMap;
+            return this;
+        }
+
         public CalligraphyConfig build() {
             this.isFontSet = !TextUtils.isEmpty(fontAssetPath);
             return new CalligraphyConfig(this);

calligraphy/src/main/java/uk/co/chrisjenx/calligraphy/TypefaceUtils.java

@@ -2,6 +2,7 @@
 
 import android.content.res.AssetManager;
 import android.graphics.Typeface;
+import android.support.annotation.Nullable;
 import android.util.Log;
 
 import java.util.HashMap;
@@ -20,6 +21,7 @@ public final class TypefaceUtils {
 
     private static final Map<String, Typeface> sCachedFonts = new HashMap<String, Typeface>();
     private static final Map<Typeface, CalligraphyTypefaceSpan> sCachedSpans = new HashMap<Typeface, CalligraphyTypefaceSpan>();
+    private static Map<String, String> sFontPathSubstitutionMap = null;
 
     /**
      * A helper loading a custom font.
@@ -28,11 +30,24 @@ public final class TypefaceUtils {
      * @param filePath     The path of the file.
      * @return Return {@link android.graphics.Typeface} or null if the path is invalid.
      */
-    public static Typeface load(final AssetManager assetManager, final String filePath) {
+    public static Typeface load(final AssetManager assetManager, String filePath) {
         synchronized (sCachedFonts) {
             try {
+                // If a valid fontPath substitution map exists, check if the filePath should be
+                // updated in order to load a different font.
+                boolean loadFromFile = false;
+                if (sFontPathSubstitutionMap != null
+                        && sFontPathSubstitutionMap.containsKey(filePath)) {
+                    filePath = sFontPathSubstitutionMap.get(filePath);
+                    loadFromFile = true;
+                }
                 if (!sCachedFonts.containsKey(filePath)) {
-                    final Typeface typeface = Typeface.createFromAsset(assetManager, filePath);
+                    final Typeface typeface;
+                    if (loadFromFile) {
+                        typeface = Typeface.createFromFile(filePath);
+                    } else {
+                        typeface = Typeface.createFromAsset(assetManager, filePath);
+                    }
                     sCachedFonts.put(filePath, typeface);
                     return typeface;
                 }
@@ -75,4 +90,8 @@ public static boolean isLoaded(Typeface typeface) {
 
     private TypefaceUtils() {
     }
+
+    static void setFontPathSubstitutionMap(@Nullable Map<String, String> fontPathSubstitutionMap) {
+        sFontPathSubstitutionMap = fontPathSubstitutionMap;
+    }
 }