JDK-8272984: javadoc support for reproducible builds

src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/HtmlConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1998, 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2022, 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
@@ -25,6 +25,7 @@
 
 package jdk.javadoc.internal.doclets.formats.html;
 
+import java.time.ZonedDateTime;
 import java.util.ArrayList;
 import java.util.Date;
 import java.util.EnumSet;
@@ -166,6 +167,11 @@ public enum ConditionalPage {
      */
     public final Set<ConditionalPage> conditionalPages;
 
+    /**
+     * The build date, to be recorded in generated files.
+     */
+    private ZonedDateTime buildDate;
+
     /**
      * Constructs the full configuration needed by the doclet, including
      * the format-specific part, defined in this class, and the format-independent
@@ -215,6 +221,7 @@ public HtmlConfiguration(Doclet doclet, Locale locale, Reporter reporter) {
 
         conditionalPages = EnumSet.noneOf(ConditionalPage.class);
     }
+
     protected void initConfiguration(DocletEnvironment docEnv,
                                      Function<String, String> resourceKeyMapper) {
         super.initConfiguration(docEnv, resourceKeyMapper);
@@ -223,7 +230,6 @@ protected void initConfiguration(DocletEnvironment docEnv,
     }
 
     private final Runtime.Version docletVersion;
-    public final Date startTime = new Date();
 
     @Override
     public Runtime.Version getDocletVersion() {
@@ -259,6 +265,10 @@ public boolean finishOptionSettings() {
         if (!options.validateOptions()) {
             return false;
         }
+
+        ZonedDateTime zdt = options.date();
+        buildDate = zdt != null ? zdt : ZonedDateTime.now();
+
         if (!getSpecifiedTypeElements().isEmpty()) {
             Map<String, PackageElement> map = new HashMap<>();
             PackageElement pkg;
@@ -279,6 +289,13 @@ public boolean finishOptionSettings() {
         return true;
     }
 
+    /**
+     * {@return the date to be recorded in generated files}
+     */
+    public ZonedDateTime getBuildDate() {
+        return buildDate;
+    }
+
     /**
      * Decide the page which will appear first in the right-hand frame. It will
      * be "overview-summary.html" if "-overview" option is used or no

src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/HtmlDocletWriter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1998, 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2022, 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
@@ -452,7 +452,7 @@ public void printHtmlDocument(List<String> metakeywords,
             throws DocFileIOException {
         List<DocPath> additionalStylesheets = configuration.getAdditionalStylesheets();
         additionalStylesheets.addAll(localStylesheets);
-        Head head = new Head(path, configuration.getDocletVersion(), configuration.startTime)
+        Head head = new Head(path, configuration.getDocletVersion(), configuration.getBuildDate())
                 .setTimestamp(!options.noTimestamp())
                 .setDescription(description)
                 .setGenerator(getGenerator(getClass()))

src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/IndexRedirectWriter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016, 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2016, 2022, 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
@@ -74,7 +74,7 @@ private IndexRedirectWriter(HtmlConfiguration configuration, DocPath filename, D
      * @throws DocFileIOException if there is a problem generating the file
      */
     private void generateIndexFile() throws DocFileIOException {
-        Head head = new Head(path, configuration.getDocletVersion(), configuration.startTime)
+        Head head = new Head(path, configuration.getDocletVersion(), configuration.getBuildDate())
                 .setTimestamp(!options.noTimestamp())
                 .setDescription("index redirect")
                 .setGenerator(getGenerator(getClass()))

src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/SourceToHTMLConverter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2022, 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
@@ -232,7 +232,7 @@ public void convertClass(TypeElement te, DocPath outputdir)
      * @param path the path for the file.
      */
     private void writeToFile(Content body, DocPath path, TypeElement te) throws DocFileIOException {
-        Head head = new Head(path, configuration.getDocletVersion(), configuration.startTime)
+        Head head = new Head(path, configuration.getDocletVersion(), configuration.getBuildDate())
 //                .setTimestamp(!options.notimestamp) // temporary: compatibility!
                 .setTitle(resources.getText("doclet.Window_Source_title"))
 //                .setCharset(options.charset) // temporary: compatibility!

src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/markup/Head.java

@@ -27,12 +27,14 @@
 
 import java.io.IOException;
 import java.io.Writer;
-import java.text.SimpleDateFormat;
+import java.time.ZonedDateTime;
+import java.time.format.DateTimeFormatter;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.Date;
 import java.util.List;
+import java.util.Locale;
 
 import jdk.javadoc.internal.doclets.toolkit.Content;
 import jdk.javadoc.internal.doclets.toolkit.util.DocPath;
@@ -50,7 +52,7 @@
  */
 public class Head extends Content {
     private final Runtime.Version docletVersion;
-    private final Date generatedDate;
+    private final ZonedDateTime generatedDate;
     private final DocPath pathToRoot;
     private String title;
     private String charset;
@@ -78,7 +80,7 @@ public class Head extends Content {
      * @param path the path for the file that will include this HEAD element
      * @param docletVersion the doclet version
      */
-    public Head(DocPath path, Runtime.Version docletVersion, Date generatedDate) {
+    public Head(DocPath path, Runtime.Version docletVersion, ZonedDateTime generatedDate) {
         this.docletVersion = docletVersion;
         this.generatedDate = generatedDate;
         pathToRoot = path.parent().invert();
@@ -279,8 +281,8 @@ private Content toContent() {
         }
 
         if (showTimestamp) {
-            SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
-            tree.add(HtmlTree.META("dc.created", dateFormat.format(generatedDate)));
+            DateTimeFormatter dateFormat = DateTimeFormatter.ofPattern("yyyy-MM-dd");
+            tree.add(HtmlTree.META("dc.created", generatedDate.format(dateFormat)));
         }
 
         if (description != null) {
@@ -309,11 +311,14 @@ private Content toContent() {
         return tree;
     }
 
-    private Comment getGeneratedBy(boolean timestamp, Date now) {
+
+    private Comment getGeneratedBy(boolean timestamp, ZonedDateTime buildDate) {
         String text = "Generated by javadoc"; // marker string, deliberately not localized
         text += " (" + docletVersion.feature() + ")";
         if (timestamp) {
-            text += " on " + now;
+            DateTimeFormatter fmt =
+                    DateTimeFormatter.ofPattern("EEE MMM dd HH:mm:ss zzz yyyy").withLocale(Locale.US);
+            text += " on " + buildDate.format(fmt);
         }
         return new Comment(text);
     }

src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/resources/standard.properties

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2010, 2021, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2010, 2022, 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
@@ -169,6 +169,12 @@ doclet.systemPropertiesSummary=System Properties Summary
 doclet.Window_Source_title=Source code
 doclet.Window_Help_title=API Help
 
+# 0: a date
+doclet.Option_date_out_of_range=value for ''--date'' out of range: {0}
+
+# 0: a date
+doclet.Option_date_not_valid=value for ''--date'' not valid: {0}
+
 doclet.help.main_heading=\
     JavaDoc Help
 doclet.help.navigation.head=\
@@ -420,6 +426,12 @@ doclet.usage.windowtitle.parameters=\
 doclet.usage.windowtitle.description=\
     Browser window title for the documentation
 
+doclet.usage.date.parameters=\
+    <date-and-time>
+doclet.usage.date.description=\
+    Specifies the value to be used to timestamp the generated\n\
+    pages, in ISO 8601 format
+
 doclet.usage.doctitle.parameters=\
     <html-code>
 doclet.usage.doctitle.description=\

src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/toolkit/BaseOptions.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2022, 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
@@ -30,8 +30,16 @@
 import java.io.OutputStream;
 import java.io.OutputStreamWriter;
 import java.io.UnsupportedEncodingException;
+import java.time.Instant;
+import java.time.ZoneOffset;
+import java.time.ZonedDateTime;
+import java.time.format.DateTimeFormatter;
+import java.time.format.DateTimeParseException;
+import java.time.temporal.ChronoUnit;
+import java.time.temporal.TemporalUnit;
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.Calendar;
 import java.util.Collections;
 import java.util.HashSet;
 import java.util.LinkedHashSet;
@@ -82,6 +90,12 @@ public abstract class BaseOptions {
      */
     private final LinkedHashSet<List<String>> customTagStrs = new LinkedHashSet<>();
 
+    /**
+     * Argument for command-line option {@code --date}.
+     * {@code null} if option not given.
+     */
+    private ZonedDateTime date;
+
     /**
      * Argument for command-line option {@code -d}.
      * Destination directory name, in which doclet will generate the entire
@@ -338,6 +352,33 @@ public boolean process(String opt, List<String> args) {
                     }
                 },
 
+                new XOption(resources, "--date", 1) {
+                    // Valid --date range: within ten years of now
+                    private static final ZonedDateTime now = ZonedDateTime.now();
+                    static final ZonedDateTime DATE_MIN = now.minusYears(10);
+                    static final ZonedDateTime DATE_MAX = now.plusYears(10);
+
+                    @Override
+                    public boolean process(String opt,  List<String> args) {
+                        if (noTimestamp) {
+                            messages.error("doclet.Option_conflict", "--date", "-notimestamp");
+                            return false;
+                        }
+                        String arg = args.get(0);
+                        try {
+                            date = ZonedDateTime.parse(arg, DateTimeFormatter.ISO_ZONED_DATE_TIME);
+                            if (date.isBefore(DATE_MIN) || date.isAfter(DATE_MAX)) {
+                                messages.error("doclet.Option_date_out_of_range", arg);
+                                return false;
+                            }
+                            return true;
+                        } catch (DateTimeParseException x) {
+                            messages.error("doclet.Option_date_not_valid", arg);
+                            return false;
+                        }
+                    }
+                },
+
                 new Option(resources, "-docencoding", 1) {
                     @Override
                     public boolean process(String opt, List<String> args) {
@@ -471,6 +512,10 @@ public boolean process(String opt, List<String> args) {
                     @Override
                     public boolean process(String opt, List<String> args) {
                         noTimestamp = true;
+                        if (date != null) {
+                            messages.error("doclet.Option_conflict", "--date", "-notimestamp");
+                            return false;
+                        }
                         return true;
                     }
                 },
@@ -739,6 +784,13 @@ LinkedHashSet<List<String>> customTagStrs() {
         return customTagStrs;
     }
 
+    /**
+     * Argument for command-line option {@code --date}.
+     */
+    public ZonedDateTime date() {
+        return date;
+    }
+
     /**
      * Argument for command-line option {@code -d}.
      * Destination directory name, in which doclet will generate the entire