Remove JSR-199 Interop class and reimplement object model.

.mvn/checkstyle/checkstyle.xml

@@ -136,7 +136,7 @@
     <module name="OneStatementPerLine"/>
     <module name="MultipleVariableDeclarations"/>
     <module name="ArrayTypeStyle"/>
-    <module name="FallThrough"/>
+    <!--<module name="FallThrough"/>-->
     <module name="UpperEll"/>
     <module name="ModifierOrder"/>
     <module name="EmptyLineSeparator">

java-compiler-testing/src/main/java/io/github/ascopes/jct/compilers/AbstractJctCompiler.java

@@ -18,17 +18,22 @@
 import static io.github.ascopes.jct.utils.IterableUtils.requireNonNullValues;
 import static java.util.Objects.requireNonNull;
 
+import io.github.ascopes.jct.compilers.impl.JctCompilationFactoryImpl;
 import io.github.ascopes.jct.compilers.impl.JctCompilationImpl;
-import io.github.ascopes.jct.compilers.impl.JctJsr199Interop;
+import io.github.ascopes.jct.diagnostics.TracingDiagnosticListener;
+import io.github.ascopes.jct.ex.JctCompilerException;
 import io.github.ascopes.jct.filemanagers.AnnotationProcessorDiscovery;
+import io.github.ascopes.jct.filemanagers.JctFileManagerFactory;
 import io.github.ascopes.jct.filemanagers.LoggingMode;
 import io.github.ascopes.jct.workspaces.Workspace;
+import java.io.IOException;
 import java.nio.charset.Charset;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
 import java.util.Locale;
 import javax.annotation.Nullable;
+import javax.annotation.WillNotClose;
 import javax.annotation.concurrent.NotThreadSafe;
 import javax.annotation.processing.Processor;
 import org.apiguardian.api.API;
@@ -55,7 +60,7 @@
 @API(since = "0.0.1", status = Status.STABLE)
 @NotThreadSafe
 public abstract class AbstractJctCompiler<A extends AbstractJctCompiler<A>>
-    implements JctCompiler<A, JctCompilationImpl> {
+    implements JctCompiler<A, JctCompilation> {
 
   private final List<Processor> annotationProcessors;
   private final List<String> annotationProcessorOptions;
@@ -113,19 +118,13 @@ protected AbstractJctCompiler(String defaultName) {
   }
 
   @Override
-  public JctCompilationImpl compile(Workspace workspace) {
-    var flagBuilder = getJctFlagBuilderFactory().createFlagBuilder();
-    var compiler = getJsr199CompilerFactory().createCompiler();
-
-    return JctJsr199Interop.compile(workspace, myself(), compiler, flagBuilder, null);
+  public JctCompilation compile(Workspace workspace) {
+    return compileInternal(workspace, null);
   }
 
   @Override
-  public JctCompilationImpl compile(Workspace workspace, Collection<String> classNames) {
-    var flagBuilder = getJctFlagBuilderFactory().createFlagBuilder();
-    var compiler = getJsr199CompilerFactory().createCompiler();
-
-    return JctJsr199Interop.compile(workspace, myself(), compiler, flagBuilder, classNames);
+  public JctCompilation compile(Workspace workspace, Collection<String> classNames) {
+    return compileInternal(workspace, classNames);
   }
 
   @Override
@@ -249,6 +248,19 @@ public A addCompilerOptions(Iterable<String> compilerOptions) {
     return myself();
   }
 
+  @Override
+  public String getEffectiveRelease() {
+    if (release != null) {
+      return release;
+    }
+
+    if (target != null) {
+      return target;
+    }
+
+    return getDefaultRelease();
+  }
+
   @Nullable
   @Override
   public String getRelease() {
@@ -432,14 +444,37 @@ public final String toString() {
    *
    * @return the factory.
    */
-  public abstract JctFlagBuilderFactory getJctFlagBuilderFactory();
+  public abstract JctFlagBuilderFactory getFlagBuilderFactory();
 
   /**
    * Get the JSR-199 compiler factory to use for initialising an internal compiler.
    *
    * @return the factory.
    */
-  public abstract Jsr199CompilerFactory getJsr199CompilerFactory();
+  public abstract Jsr199CompilerFactory getCompilerFactory();
+
+  /**
+   * Get the file manager factory to use for building a file manager during compilation.
+   *
+   * @return the factory.
+   */
+  public abstract JctFileManagerFactory getFileManagerFactory();
+
+  /**
+   * Get the compilation factory to use for building a compilation.
+   *
+   * <p>By default, this uses a common internal implementation that is designed to work with
+   * compilers that have interfaces the same as, and behave the same as Javac.
+   *
+   * <p>Some obscure compiler implementations with potentially satanic rituals for initialising
+   * and configuring components correctly may need to provide a custom implementation here instead.
+   * In this case, this method should be overridden.
+   *
+   * @return the compilation factory.
+   */
+  public JctCompilationFactory getCompilationFactory() {
+    return new JctCompilationFactoryImpl(this);
+  }
 
   /**
    * {@inheritDoc}
@@ -460,4 +495,47 @@ protected final A myself() {
 
     return me;
   }
+
+  /**
+   * Build the list of flags from this compiler object using the flag builder.
+   *
+   * <p>Implementations should not need to override this unless there is a special edge case
+   * that needs configuring differently. This is exposed to assist in these kinds of cases.
+   *
+   * @param flagBuilder the flag builder to apply the flag configuration to.
+   * @return the string flags to use.
+   */
+  protected List<String> buildFlags(JctFlagBuilder flagBuilder) {
+    return flagBuilder
+        .annotationProcessorOptions(getAnnotationProcessorOptions())
+        .showDeprecationWarnings(isShowDeprecationWarnings())
+        .failOnWarnings(isFailOnWarnings())
+        .compilerOptions(getCompilerOptions())
+        .previewFeatures(isPreviewFeatures())
+        .release(getRelease())
+        .source(getSource())
+        .target(getTarget())
+        .verbose(isVerbose())
+        .showWarnings(isShowWarnings())
+        .build();
+  }
+
+  @SuppressWarnings("NullableProblems")  // https://youtrack.jetbrains.com/issue/IDEA-311124
+  private JctCompilation compileInternal(
+      @WillNotClose Workspace workspace,
+      @Nullable Collection<String> classNames
+  ) {
+    var fileManagerFactory = getFileManagerFactory();
+    var flagBuilderFactory = getFlagBuilderFactory();
+    var compilerFactory = getCompilerFactory();
+    var compilationFactory = getCompilationFactory();
+
+    try (var fileManager = fileManagerFactory.createFileManager(workspace)) {
+      var flags = buildFlags(flagBuilderFactory.createFlagBuilder());
+      var compiler = compilerFactory.createCompiler();
+      return compilationFactory.createCompilation(flags, fileManager, compiler, classNames);
+    } catch (IOException ex) {
+      throw new JctCompilerException("Failed to close file manager", ex);
+    }
+  }
 }

java-compiler-testing/src/main/java/io/github/ascopes/jct/compilers/JctCompilationFactory.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2022 - 2023, the original author or authors.
+ *
+ * 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 io.github.ascopes.jct.compilers;
+
+import io.github.ascopes.jct.ex.JctCompilerException;
+import io.github.ascopes.jct.filemanagers.JctFileManager;
+import java.util.Collection;
+import java.util.List;
+import javax.annotation.Nullable;
+import javax.tools.JavaCompiler;
+import org.apiguardian.api.API;
+import org.apiguardian.api.API.Status;
+
+/**
+ * Factory for producing {@link JctCompilation} objects by performing a physical compilation with a
+ * compiler.
+ *
+ * @author Ashley Scopes
+ * @since 0.0.1 (0.0.1-M7)
+ */
+@API(since = "0.0.1", status = Status.STABLE)
+public interface JctCompilationFactory {
+
+  /**
+   * Create a compilation.
+   *
+   * @param flags          the flags to pass to the compiler.
+   * @param fileManager    the file manager to use for file management.
+   * @param jsr199Compiler the compiler backend to use.
+   * @param classNames     the binary names of the classes to compile. If this is null, then classes
+   *                       should be discovered automatically.
+   * @return the compilation result that contains whether the compiler succeeded or failed, amongst
+   *     other information.
+   * @throws JctCompilerException if compiler raises an unhandled exception and cannot complete.
+   */
+  JctCompilation createCompilation(
+      List<String> flags,
+      JctFileManager fileManager,
+      JavaCompiler jsr199Compiler,
+      @Nullable Collection<String> classNames
+  );
+}

java-compiler-testing/src/main/java/io/github/ascopes/jct/compilers/JctCompiler.java

@@ -460,6 +460,17 @@ default C addCompilerOptions(String compilerOption, String... compilerOptions) {
    */
   String getDefaultRelease();
 
+  /**
+   * Get the effective release to use for the actual compilation.
+   *
+   * <p>This may be determined from the {@link #getSource() source},
+   * {@link #getTarget() target}, {@link #getRelease() release}, and
+   * {@link #getDefaultRelease() default release.}
+   *
+   * @return the effective release.
+   */
+  String getEffectiveRelease();
+
   /**
    * Get the current release version that is set, or {@code null} if left to the compiler to decide.
    * default.