Java Maps.filterKeys方法代碼示例

import com.google.common.collect.Maps; //導入方法依賴的package包/類
@Override
public ImmutableMap<String, BuildRule> resolve(Set<String> classes) {
  ImmutableSet<String> projectClasses =
      classes.stream().filter(name -> whiteList.matcher(name).find()).collect(toImmutableSet());

  Map<String, Path> classToSrcFileMap =
      Maps.filterKeys(classToFile, k -> projectClasses.contains(k));

  handleUnresolvedClasses(projectClasses, classToSrcFileMap.keySet());

  ImmutableGraph<String> resolvedClassGraph =
      ImmutableGraph.copyOf(Graphs.inducedSubgraph(classGraph, classToSrcFileMap.keySet()));

  ImmutableGraph<Path> srcFileGraph =
      ClassToSourceGraphConsolidator.map(resolvedClassGraph, classToSrcFileMap);

  ImmutableGraph<ImmutableSet<Path>> componentDAG =
      new StronglyConnectedComponents<>(srcFileGraph).computeComponentDAG();

  return ImmutableMap.copyOf(
      mapClassToBuildRule(componentDAG, classToSrcFileMap, resolvedClassGraph));
}
 

import com.google.common.collect.Maps; //導入方法依賴的package包/類
/**
 * A settings that are filtered (and key is removed) with the specified prefix.
 */
public Settings getByPrefix(String prefix) {
    if (!prefix.endsWith(".")) {
        prefix += ".";
    }
    String _prefix = prefix;
    Map<String, String> sub = Maps.filterKeys(settings, key -> key.startsWith(_prefix));

    HashMap<String, String> result = Maps.newHashMap();

    for (Map.Entry<String, String> entry : sub.entrySet()) {
        result.put(entry.getKey().substring(_prefix.length()), entry.getValue());
    }

    return new Settings(ImmutableMap.copyOf(result));
}
 

import com.google.common.collect.Maps; //導入方法依賴的package包/類
/**
 * 將headers合成一個字符串
 * 需要注意的是，HTTP頭需要按照字母排序加入簽名字符串
 * 同時所有加入簽名的頭的列表，需要用逗號分隔形成一個字符串，加入一個新HTTP頭@"X-Ca-Signature-Headers"
 *
 */
private static String buildHeaders(Map<String, String> headers) {

    if (MapUtils.isNotEmpty(headers)) {
        // 篩選出需要簽名的key
        Predicate<String> signFilter = new Predicate<String>() {
            @Override
            public boolean apply(String input) {
                return input.startsWith(SdkConstant.CLOUDAPI_CA_HEADER_TO_SIGN_PREFIX_SYSTEM);
            }
        };

        // 使用TreeMap,默認按照字母排序
        Map<String, String> headersToSign = new TreeMap<String, String>(Maps.filterKeys(headers, signFilter));

        // 所有加入簽名的頭的列表，需要用逗號分隔形成一個字符串，加入一個新HTTP頭@"X-Ca-Signature-Headers"
        String signHeaders = Joiner.on(',').join(headersToSign.keySet());
        headers.put(SdkConstant.CLOUDAPI_X_CA_SIGNATURE_HEADERS, signHeaders);

        // 拚裝簽名內容
        Joiner.MapJoiner joiner = Joiner.on(SdkConstant.CLOUDAPI_LF).withKeyValueSeparator(':');
        return joiner.join(headersToSign);

    } else {
        return StringUtils.EMPTY;
    }


}
 

import com.google.common.collect.Maps; //導入方法依賴的package包/類
private static Capabilities dropCapabilities(Capabilities capabilities, String... keysToRemove) {
    if (capabilities == null) {
        return new DesiredCapabilities();
    }
    final Set<String> toRemove = Sets.newHashSet(keysToRemove);
    DesiredCapabilities caps = new DesiredCapabilities(Maps.filterKeys(capabilities.asMap(), new Predicate<String>() {
        @Override public boolean apply(String key) {
            return !toRemove.contains(key);
        }
    }));

    return caps;
}
 

import com.google.common.collect.Maps; //導入方法依賴的package包/類
/**
 * retains only metadata pertaining to responses for which we have a score.
 */
public static ArgumentOutput from(final Symbol docId,
    final Iterable<Scored<Response>> scoredResponses, final Map<Response, String> metadata) {
  ImmutableSet<Response> responses =
      ImmutableSet.copyOf(transform(scoredResponses, Scoreds.<Response>itemsOnly()));
  return new ArgumentOutput(docId, responses, Scoreds.asMapKeepingHigestScore(scoredResponses),
      Maps.filterKeys(metadata, Predicates.in(responses)));
}