8185628: Backport jdk/test/lib/testlibrary/CompilerUtils.java to jdk8u which is helpful in test development
Utility class for compiling Java source files
Reviewed-by: coffeys
diff --git a/jdk/test/lib/testlibrary/CompilerUtils.java b/jdk/test/lib/testlibrary/CompilerUtils.java
new file mode 100644
index 0000000..3eaa438
--- /dev/null
+++ b/jdk/test/lib/testlibrary/CompilerUtils.java
@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.stream.Collectors;
+
+import javax.tools.JavaCompiler;
+import javax.tools.StandardJavaFileManager;
+import javax.tools.StandardLocation;
+import javax.tools.ToolProvider;
+
+import jdk.testlibrary.OutputAnalyzer;
+import jdk.testlibrary.ProcessTools;
+
+/**
+ * This class consists exclusively of static utility methods for invoking the
+ * java compiler.
+ */
+
+public final class CompilerUtils {
+ private static final String TEST_JAVA_HOME = System.getProperty("test.jdk");
+ private static final String FS = File.separator;
+ private static final String JAVAC = TEST_JAVA_HOME + FS + "bin" + FS + "javac";
+
+ private CompilerUtils() { }
+
+ /**
+ * Compile all the java sources in {@code <source>/**} to
+ * {@code <destination>/**}. The destination directory will be created if
+ * it doesn't exist.
+ *
+ * All warnings/errors emitted by the compiler are output to System.out/err.
+ *
+ * @return true if the compilation is successful
+ *
+ * @throws IOException
+ * if there is an I/O error scanning the source tree or
+ * creating the destination directory
+ * @throws UnsupportedOperationException
+ * if there is no system java compiler
+ */
+ public static boolean compile(Path source, Path destination, String ... options)
+ throws IOException
+ {
+ List<Path> sources
+ = Files.find(source, Integer.MAX_VALUE,
+ (file, attrs) -> (file.toString().endsWith(".java")))
+ .collect(Collectors.toList());
+
+ Files.createDirectories(destination);
+ List<String> opts = Arrays.asList(options);
+ List<String> compileargs = new ArrayList<String> ();
+ compileargs.add(JAVAC);
+ compileargs.add("-d");
+ compileargs.add(destination.toString());
+ for(String opt: opts) {
+ compileargs.add(opt);
+ }
+ for(Path p: sources) {
+ compileargs.add(p.toString());
+ }
+
+ OutputAnalyzer output = null;
+ try {
+ String[] sarr = compileargs.toArray(new String[0]);
+ output = ProcessTools.executeCommand(sarr);
+ output.shouldHaveExitValue(0);
+ } catch (Throwable t) {
+ throw new RuntimeException("Javac failed", t);
+ }
+
+ return true;
+ }
+}
