1 /* 2 * Copyright (C) 2014 The Dagger Authors. 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 dagger.internal.codegen.binding; 18 19 import static dagger.internal.codegen.binding.SourceFiles.simpleVariableName; 20 import static dagger.internal.codegen.xprocessing.XElements.getSimpleName; 21 22 import com.google.common.base.Ascii; 23 import com.google.common.base.CaseFormat; 24 import dagger.internal.codegen.model.DependencyRequest; 25 import java.util.regex.Matcher; 26 import java.util.regex.Pattern; 27 28 /** 29 * Picks a reasonable name for what we think is being provided from the variable name associated 30 * with the {@link DependencyRequest}. I.e. strips out words like "lazy" and "provider" if we 31 * believe that those refer to {@link dagger.Lazy} and {@link javax.inject.Provider} rather than the 32 * type being provided. 33 */ 34 // TODO(gak): develop the heuristics to get better names 35 final class DependencyVariableNamer { 36 private static final Pattern LAZY_PROVIDER_PATTERN = Pattern.compile("lazy(\\w+)Provider"); 37 name(DependencyRequest dependency)38 static String name(DependencyRequest dependency) { 39 if (!dependency.requestElement().isPresent()) { 40 return simpleVariableName(dependency.key().type().xprocessing().getTypeElement()); 41 } 42 43 String variableName = getSimpleName(dependency.requestElement().get().xprocessing()); 44 if (Ascii.isUpperCase(variableName.charAt(0))) { 45 variableName = toLowerCamel(variableName); 46 } 47 switch (dependency.kind()) { 48 case INSTANCE: 49 return variableName; 50 case LAZY: 51 return variableName.startsWith("lazy") && !variableName.equals("lazy") 52 ? toLowerCamel(variableName.substring(4)) 53 : variableName; 54 case PROVIDER_OF_LAZY: 55 Matcher matcher = LAZY_PROVIDER_PATTERN.matcher(variableName); 56 if (matcher.matches()) { 57 return toLowerCamel(matcher.group(1)); 58 } 59 // fall through 60 case PROVIDER: 61 return variableName.endsWith("Provider") && !variableName.equals("Provider") 62 ? variableName.substring(0, variableName.length() - 8) 63 : variableName; 64 case PRODUCED: 65 return variableName.startsWith("produced") && !variableName.equals("produced") 66 ? toLowerCamel(variableName.substring(8)) 67 : variableName; 68 case PRODUCER: 69 return variableName.endsWith("Producer") && !variableName.equals("Producer") 70 ? variableName.substring(0, variableName.length() - 8) 71 : variableName; 72 default: 73 throw new AssertionError(); 74 } 75 } 76 toLowerCamel(String name)77 private static String toLowerCamel(String name) { 78 return CaseFormat.UPPER_CAMEL.to(CaseFormat.LOWER_CAMEL, name); 79 } 80 } 81