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test/org/apache/tomcat/util/buf/TestCharsetCache.java

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+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one or more
+ *  contributor license agreements.  See the NOTICE file distributed with
+ *  this work for additional information regarding copyright ownership.
+ *  The ASF licenses this file to You 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 org.apache.tomcat.util.buf;
+
+import java.nio.charset.Charset;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Locale;
+import java.util.Set;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TestCharsetCache {
+
+    @Test
+    public void testAllKnownCharsets() {
+
+        Set<String> known = new HashSet<>();
+        known.addAll(Arrays.asList(CharsetCache.LAZY_CHARSETS));
+        Set<String> initial = new HashSet<>();
+        initial.addAll(Arrays.asList(CharsetCache.INITIAL_CHARSETS));
+
+        List<String> cacheMisses = new ArrayList<>();
+
+        for (Charset charset: Charset.availableCharsets().values()) {
+            String name = charset.name().toLowerCase(Locale.ENGLISH);
+
+            // No need to test the charsets that are pre-loaded
+            if (initial.contains(name)) {
+                continue;
+            }
+
+            if (!known.contains(name)) {
+                cacheMisses.add(name);
+            }
+
+            for (String alias : charset.aliases()) {
+                alias = alias.toLowerCase(Locale.ENGLISH);
+                if (!known.contains(alias)) {
+                    cacheMisses.add(alias);
+                }
+            }
+        }
+
+        if (cacheMisses.size() != 0) {
+            StringBuilder sb = new StringBuilder();
+            Collections.sort(cacheMisses);
+            for (String name : cacheMisses) {
+                if (sb.length() == 0) {
+                    sb.append('"');
+                } else {
+                    sb.append(", \"");
+                }
+                sb.append(name.toLowerCase(Locale.ENGLISH));
+                sb.append('"');
+            }
+            System.out.println(sb.toString());
+        }
+
+        Assert.assertTrue(cacheMisses.size() == 0);
+    }
+}