| /* |
| * Copyright (C) 2018 The Android Open Source Project |
| * |
| * 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 android.graphics.fonts; |
| |
| import android.annotation.NonNull; |
| import android.graphics.FontListParser; |
| import android.text.FontConfig; |
| import android.util.Xml; |
| |
| import org.xmlpull.v1.XmlPullParser; |
| import org.xmlpull.v1.XmlPullParserException; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.ArrayList; |
| import java.util.HashSet; |
| |
| /** |
| * Parser for font customization |
| * |
| * @hide |
| */ |
| public class FontCustomizationParser { |
| /** |
| * Represents a customization XML |
| */ |
| public static class Result { |
| ArrayList<FontConfig.Family> mAdditionalNamedFamilies = new ArrayList<>(); |
| ArrayList<FontConfig.Alias> mAdditionalAliases = new ArrayList<>(); |
| } |
| |
| /** |
| * Parses the customization XML |
| * |
| * Caller must close the input stream |
| */ |
| public static Result parse(@NonNull InputStream in, @NonNull String fontDir) |
| throws XmlPullParserException, IOException { |
| XmlPullParser parser = Xml.newPullParser(); |
| parser.setInput(in, null); |
| parser.nextTag(); |
| return readFamilies(parser, fontDir); |
| } |
| |
| private static void validate(Result result) { |
| HashSet<String> familyNames = new HashSet<>(); |
| for (int i = 0; i < result.mAdditionalNamedFamilies.size(); ++i) { |
| final FontConfig.Family family = result.mAdditionalNamedFamilies.get(i); |
| final String name = family.getName(); |
| if (name == null) { |
| throw new IllegalArgumentException("new-named-family requires name attribute"); |
| } |
| if (!familyNames.add(name)) { |
| throw new IllegalArgumentException( |
| "new-named-family requires unique name attribute"); |
| } |
| } |
| } |
| |
| private static Result readFamilies(XmlPullParser parser, String fontDir) |
| throws XmlPullParserException, IOException { |
| Result out = new Result(); |
| parser.require(XmlPullParser.START_TAG, null, "fonts-modification"); |
| while (parser.next() != XmlPullParser.END_TAG) { |
| if (parser.getEventType() != XmlPullParser.START_TAG) continue; |
| String tag = parser.getName(); |
| if (tag.equals("family")) { |
| readFamily(parser, fontDir, out); |
| } else if (tag.equals("alias")) { |
| out.mAdditionalAliases.add(FontListParser.readAlias(parser)); |
| } else { |
| FontListParser.skip(parser); |
| } |
| } |
| validate(out); |
| return out; |
| } |
| |
| private static void readFamily(XmlPullParser parser, String fontDir, Result out) |
| throws XmlPullParserException, IOException { |
| final String customizationType = parser.getAttributeValue(null, "customizationType"); |
| if (customizationType == null) { |
| throw new IllegalArgumentException("customizationType must be specified"); |
| } |
| if (customizationType.equals("new-named-family")) { |
| out.mAdditionalNamedFamilies.add(FontListParser.readFamily(parser, fontDir)); |
| } else { |
| throw new IllegalArgumentException("Unknown customizationType=" + customizationType); |
| } |
| } |
| } |