Java tutorial
// Copyright 2015 The Bazel Authors. All rights reserved. // // 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 com.google.devtools.build.lib.rules.objc; import static com.google.devtools.build.lib.collect.nestedset.Order.STABLE_ORDER; import static com.google.devtools.build.lib.rules.objc.ObjcProvider.JRE_LIBRARY; import static com.google.devtools.build.lib.rules.objc.ObjcProvider.LIBRARY; import static com.google.devtools.build.lib.rules.objc.XcodeProductType.LIBRARY_STATIC; import com.google.common.collect.ImmutableList; import com.google.devtools.build.lib.actions.Artifact; import com.google.devtools.build.lib.analysis.ConfiguredTarget; import com.google.devtools.build.lib.analysis.RuleConfiguredTarget.Mode; import com.google.devtools.build.lib.analysis.RuleConfiguredTargetBuilder; import com.google.devtools.build.lib.analysis.RuleContext; import com.google.devtools.build.lib.analysis.RunfilesProvider; import com.google.devtools.build.lib.collect.nestedset.NestedSetBuilder; import com.google.devtools.build.lib.packages.BuildType; import com.google.devtools.build.lib.packages.RuleClass.ConfiguredTargetFactory.RuleErrorException; import com.google.devtools.build.lib.rules.RuleConfiguredTargetFactory; import com.google.devtools.build.lib.syntax.Type; import com.google.devtools.build.lib.vfs.PathFragment; import java.util.List; /** * Implementation for the "j2objc_library" rule, which exports ObjC source files translated from * Java source files in java_library rules to dependent objc_binary rules for compilation and * linking into the final application bundle. See {@link J2ObjcLibraryBaseRule} for details. */ public class J2ObjcLibrary implements RuleConfiguredTargetFactory { public static final String NO_ENTRY_CLASS_ERROR_MSG = "Entry classes must be specified when flag --compilationMode=opt is on in order to" + " perform J2ObjC dead code stripping."; public static final List<String> J2OBJC_SUPPORTED_RULES = ImmutableList.of("java_import", "java_library", "proto_library"); @Override public ConfiguredTarget create(RuleContext ruleContext) throws InterruptedException, RuleErrorException { checkAttributes(ruleContext); if (ruleContext.hasErrors()) { return null; } J2ObjcEntryClassProvider j2ObjcEntryClassProvider = new J2ObjcEntryClassProvider.Builder() .addTransitive(ruleContext) .addEntryClasses(ruleContext.attributes().get("entry_classes", Type.STRING_LIST)).build(); Iterable<ObjcProvider> jreDeps = ruleContext.getPrerequisites("jre_deps", Mode.TARGET, ObjcProvider.class); ObjcProvider.Builder objcProviderBuilder = new ObjcProvider.Builder().addTransitiveAndPropagate(jreDeps) .addTransitiveAndPropagate(ruleContext.getPrerequisites("deps", Mode.TARGET, ObjcProvider.class)); for (ObjcProvider prereq : jreDeps) { objcProviderBuilder.addTransitiveAndPropagate(JRE_LIBRARY, prereq.get(LIBRARY)); } XcodeProvider.Builder xcodeProviderBuilder = new XcodeProvider.Builder(); XcodeSupport xcodeSupport = new XcodeSupport(ruleContext).addJreDependencies(xcodeProviderBuilder) .addDependencies(xcodeProviderBuilder, new Attribute("deps", Mode.TARGET)); ObjcProvider objcProvider = objcProviderBuilder.build(); xcodeSupport.addXcodeSettings(xcodeProviderBuilder, objcProvider, LIBRARY_STATIC); J2ObjcMappingFileProvider j2ObjcMappingFileProvider = J2ObjcMappingFileProvider .union(ruleContext.getPrerequisites("deps", Mode.TARGET, J2ObjcMappingFileProvider.class)); return new RuleConfiguredTargetBuilder(ruleContext) .setFilesToBuild(NestedSetBuilder.<Artifact>emptySet(STABLE_ORDER)) .add(RunfilesProvider.class, RunfilesProvider.EMPTY) .addProvider(J2ObjcEntryClassProvider.class, j2ObjcEntryClassProvider) .addProvider(J2ObjcMappingFileProvider.class, j2ObjcMappingFileProvider) .addProvider(ObjcProvider.class, objcProvider) .addProvider(XcodeProvider.class, xcodeProviderBuilder.build()).build(); } /** * Returns header search paths necessary to compile the J2ObjC-generated code from a single * target. * * @param ruleContext the rule context * @param objcFileRootExecPath the exec path under which all J2ObjC-generated file resides * @param sourcesToTranslate the source files to be translated by J2ObjC in a single target */ public static Iterable<PathFragment> j2objcSourceHeaderSearchPaths(RuleContext ruleContext, PathFragment objcFileRootExecPath, Iterable<Artifact> sourcesToTranslate) { PathFragment genRoot = ruleContext.getConfiguration().getGenfilesFragment(); ImmutableList.Builder<PathFragment> headerSearchPaths = ImmutableList.builder(); headerSearchPaths.add(objcFileRootExecPath); // We add another header search path with gen root if we have generated sources to translate. for (Artifact sourceToTranslate : sourcesToTranslate) { if (!sourceToTranslate.isSourceArtifact()) { headerSearchPaths.add(new PathFragment(objcFileRootExecPath, genRoot)); return headerSearchPaths.build(); } } return headerSearchPaths.build(); } private static void checkAttributes(RuleContext ruleContext) { checkAttributes(ruleContext, "deps"); checkAttributes(ruleContext, "exports"); } private static void checkAttributes(RuleContext ruleContext, String attributeName) { if (!ruleContext.attributes().has(attributeName, BuildType.LABEL_LIST)) { return; } List<String> entryClasses = ruleContext.attributes().get("entry_classes", Type.STRING_LIST); J2ObjcConfiguration j2objcConfiguration = ruleContext.getFragment(J2ObjcConfiguration.class); if (j2objcConfiguration.removeDeadCode() && (entryClasses == null || entryClasses.isEmpty())) { ruleContext.attributeError("entry_classes", NO_ENTRY_CLASS_ERROR_MSG); } } }