A mojo to generate implementations of jaxb Quick

Signed-off-by: Lukas Jungmann <lukas.jungmann@oracle.com>

istack-commons/maven-plugin/src/main/java/com/sun/istack/maven/LicenseCodeWriter.java

@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 2023 Oracle and/or its affiliates. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Distribution License v. 1.0, which is available at
+ * http://www.eclipse.org/org/documents/edl-v10.php.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+package com.sun.istack.maven;
+
+import com.sun.codemodel.CodeWriter;
+import com.sun.codemodel.JPackage;
+import com.sun.codemodel.writer.FilterCodeWriter;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.io.Writer;
+import java.nio.charset.Charset;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.Calendar;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+/**
+ * Writes all the source files under the specified file folder and inserts a
+ * license file each java source file.
+ */
+final class LicenseCodeWriter extends FilterCodeWriter {
+
+    private static final String COPYRIGHT_LINE_TEMPLATE = "^.*Copyright \\(c\\) (YYYY) (by )?([A-Za-z].*)$";
+    private static final Pattern PATTERN = Pattern.compile(COPYRIGHT_LINE_TEMPLATE, Pattern.MULTILINE);
+    private static final String CURRENT_YEAR = String.valueOf(Calendar.getInstance().get(Calendar.YEAR));
+
+    private final Path license;
+
+    /**
+     * @param core     This CodeWriter will be used to actually create a storage
+     *                 for files. LicenseCodeWriter simply decorates this underlying
+     *                 CodeWriter by adding prolog comments.
+     * @param license  license File
+     * @param encoding encoding
+     */
+    public LicenseCodeWriter(CodeWriter core, File license, String encoding) {
+        super(core);
+        this.license = license.toPath();
+        this.encoding = encoding;
+    }
+
+    @Override
+    public Writer openSource(JPackage pkg, String fileName) throws IOException {
+        Writer w = super.openSource(pkg, fileName);
+
+        PrintWriter out = new PrintWriter(w);
+        try (BufferedReader br = Files.newBufferedReader(license, Charset.forName(encoding))) {
+            String line;
+            while ((line = br.readLine()) != null) {
+                Matcher m = PATTERN.matcher(line);
+                if (m.matches()) {
+                    out.write(line, 0, m.start(1));
+                    out.write(CURRENT_YEAR);
+                    out.write(line, m.end(1), line.length() - m.end(1));
+                } else {
+                    out.write(line);
+                }
+                out.write(System.lineSeparator());
+            }
+        }
+
+        out.flush();    // we can't close the stream for that would close the underlying stream.
+
+        return w;
+    }
+}