[Android] Implement min/max on all supported date types

content/public/android/java/src/org/chromium/content/browser/input/DateDialogNormalizer.java

Index: content/public/android/java/src/org/chromium/content/browser/input/DateDialogNormalizer.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/input/DateDialogNormalizer.java b/content/public/android/java/src/org/chromium/content/browser/input/DateDialogNormalizer.java
new file mode 100644
index 0000000000000000000000000000000000000000..05f7a33719a2f5c5198eec1f5cf6fffa0d7f0ddb
--- /dev/null
+++ b/content/public/android/java/src/org/chromium/content/browser/input/DateDialogNormalizer.java
@@ -0,0 +1,72 @@
+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.content.browser.input;
+
+import android.widget.DatePicker;
+import android.widget.DatePicker.OnDateChangedListener;
+
+import java.util.Calendar;
+
+/**
+ * Normalize a date dialog so that it respect min and max.
+ */
+class DateDialogNormalizer {
+    private static final long ONE_DAY_MILLIS = 24 * 60 * 60 * 1000;
+
+    private static void setLimits(DatePicker picker, long min, long max) {
+        // DatePicker intervals are non inclusive.
+        long minTime = min > 0 ? min - 1 : 0;
+        long maxTime = (max - ONE_DAY_MILLIS) >= (Long.MAX_VALUE - ONE_DAY_MILLIS) ?
+                Long.MAX_VALUE : max + ONE_DAY_MILLIS;
+
+        // While the widget is only able to display date, min/max can also contain time
+        // information.
+        // Trim min/max to date before adjusting the picker.
+        Calendar cal = Calendar.getInstance();
+        cal.clear();
+        cal.setTimeInMillis(max);
+
+        picker.setMaxDate(trimToDate(maxTime));
+        picker.setMinDate(trimToDate(minTime));
+    }
+
+    /**
+     * Resets the hour, minute, second piece of a time stamp to 0, maintaining the remaining
+     * components (year, month, day).
+     */
+    private static long trimToDate(long time) {
+        Calendar cal = Calendar.getInstance();
+        cal.clear();
+        cal.setTimeInMillis(time);
+        Calendar result = Calendar.getInstance();
+        result.clear();
+        result.set(cal.get(Calendar.YEAR), cal.get(Calendar.MONTH), cal.get(Calendar.DAY_OF_MONTH),
+                0, 0, 0);
+        return result.getTimeInMillis();
+    }
+
+    /**
+     * Normalizes an existing DateDialogPicker changing the default date if
+     * needed to comply with the {@code min} and {@code max} attributes.
+     */
+    static void normalize(DatePicker picker, OnDateChangedListener listener,
+            int year, int month, int day, int hour, int minute, long min, long max) {
+        Calendar calendar = Calendar.getInstance();
+        calendar.clear();
+        calendar.set(year, month, day, hour, minute, 0);
+        if (calendar.getTimeInMillis() < min) {
+            calendar.clear();
+            calendar.setTimeInMillis(min);
+        } else if (calendar.getTimeInMillis() > max) {
+            calendar.clear();
+            calendar.setTimeInMillis(max);
+        }
+        picker.init(
+                calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH),
+                calendar.get(Calendar.DAY_OF_MONTH), listener);
+
+        setLimits(picker, min, max);
+    }
+}