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Java example source code file (HttpHeadersTest.java)

This example Java source code file (HttpHeadersTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

dnt, etag, exception, field, immutablebimap, immutableset, joiner, list, reflection, splitter, string, testcase, url, util, x-webkit-csp-report-only

The HttpHeadersTest.java Java example source code

/*
 * Copyright (C) 2011 The Guava Authors
 *
 * 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.google.common.net;

import com.google.common.base.Ascii;
import com.google.common.base.Joiner;
import com.google.common.base.Splitter;
import com.google.common.collect.ImmutableBiMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Lists;

import junit.framework.TestCase;

import java.lang.reflect.Field;
import java.util.List;

/**
 * Tests for the HttpHeaders class.
 *
 * @author Kurt Alfred Kluever
 */
public class HttpHeadersTest extends TestCase {

  public void testConstantNameMatchesString() throws Exception {
    // Special case some of the weird HTTP Header names...
    ImmutableBiMap<String, String> specialCases = ImmutableBiMap.of("ETAG", "ETag",
        "X_WEBKIT_CSP", "X-WebKit-CSP", "X_WEBKIT_CSP_REPORT_ONLY", "X-WebKit-CSP-Report-Only");
    ImmutableSet<String> uppercaseAcronyms = ImmutableSet.of(
        "ID", "DNT", "IP", "MD5", "P3P", "TE", "UID", "URL", "WWW", "XSS");
    assertConstantNameMatchesString(HttpHeaders.class, specialCases, uppercaseAcronyms);
  }

  // Visible for other tests to use
  static void assertConstantNameMatchesString(Class<?> clazz,
      ImmutableBiMap<String, String> specialCases, ImmutableSet uppercaseAcronyms)
      throws IllegalAccessException {
    for (Field field : relevantFields(clazz)) {
      assertEquals(upperToHttpHeaderName(field.getName(), specialCases, uppercaseAcronyms),
          field.get(null));
    }
  }

  // Visible for other tests to use
  static ImmutableSet<Field> relevantFields(Class cls) {
    ImmutableSet.Builder<Field> builder = ImmutableSet.builder();
    for (Field field : cls.getDeclaredFields()) {
      /*
       * Coverage mode generates synthetic fields.  If we ever add private
       * fields, they will cause similar problems, and we may want to switch
       * this check to isAccessible().
       */
      if (!field.isSynthetic() && field.getType() == String.class) {
        builder.add(field);
      }
    }
    return builder.build();
  }

  private static final Splitter SPLITTER = Splitter.on('_');
  private static final Joiner JOINER = Joiner.on('-');

  private static String upperToHttpHeaderName(String constantName,
      ImmutableBiMap<String, String> specialCases, ImmutableSet uppercaseAcronyms) {
    if (specialCases.containsKey(constantName)) {
      return specialCases.get(constantName);
    }
    List<String> parts = Lists.newArrayList();
    for (String part : SPLITTER.split(constantName)) {
      if (!uppercaseAcronyms.contains(part)) {
        part = part.charAt(0) + Ascii.toLowerCase(part.substring(1));
      }
      parts.add(part);
    }
    return JOINER.join(parts);
  }
}

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