1 /* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package android.databinding.annotationprocessor; 18 19 import android.databinding.BindingBuildInfo; 20 import android.databinding.tool.processing.ScopedException; 21 import android.databinding.tool.util.L; 22 import android.databinding.tool.util.Preconditions; 23 24 import java.lang.annotation.Annotation; 25 26 import javax.annotation.processing.RoundEnvironment; 27 import javax.lang.model.element.Element; 28 29 public class BuildInfoUtil { 30 private static BindingBuildInfo sCached; load(RoundEnvironment roundEnvironment)31 public static BindingBuildInfo load(RoundEnvironment roundEnvironment) { 32 if (sCached == null) { 33 sCached = extractNotNull(roundEnvironment, BindingBuildInfo.class); 34 if (sCached != null) { 35 L.setDebugLog(sCached.enableDebugLogs()); 36 ScopedException.encodeOutput(sCached.printEncodedError()); 37 } 38 } 39 return sCached; 40 } 41 extractNotNull(RoundEnvironment roundEnv, Class<T> annotationClass)42 private static <T extends Annotation> T extractNotNull(RoundEnvironment roundEnv, 43 Class<T> annotationClass) { 44 T result = null; 45 for (Element element : roundEnv.getElementsAnnotatedWith(annotationClass)) { 46 final T info = element.getAnnotation(annotationClass); 47 if (info == null) { 48 continue; // It gets confused between BindingAppInfo and BinderBundle 49 } 50 Preconditions.check(result == null, "Should have only one %s", 51 annotationClass.getCanonicalName()); 52 result = info; 53 } 54 return result; 55 } 56 } 57