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app/src/main/java/com/hippo/widget/DateUtils.java

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+/*
+ * Copyright (C) 2014 Hippo Seven
+ *
+ * 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 com.hippo.widget;
+
+final class DateUtils {
+
+    public  static final char QUOTE = '\'';
+    public  static final char SECONDS = 's';
+
+    public static boolean hasSeconds(CharSequence inFormat) {
+        return hasDesignator(inFormat, SECONDS);
+    }
+
+    public static boolean hasDesignator(CharSequence inFormat, char designator) {
+        if (inFormat == null) return false;
+
+        final int length = inFormat.length();
+
+        int c;
+        int count;
+
+        for (int i = 0; i < length; i += count) {
+            count = 1;
+            c = inFormat.charAt(i);
+
+            if (c == QUOTE) {
+                count = skipQuotedText(inFormat, i, length);
+            } else if (c == designator) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    private static int skipQuotedText(CharSequence s, int i, int len) {
+        if (i + 1 < len && s.charAt(i + 1) == QUOTE) {
+            return 2;
+        }
+
+        int count = 1;
+        // skip leading quote
+        i++;
+
+        while (i < len) {
+            char c = s.charAt(i);
+
+            if (c == QUOTE) {
+                count++;
+                //  QUOTEQUOTE -> QUOTE
+                if (i + 1 < len && s.charAt(i + 1) == QUOTE) {
+                    i++;
+                } else {
+                    break;
+                }
+            } else {
+                i++;
+                count++;
+            }
+        }
+
+        return count;
+    }
+}