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Java.libraries.feign.EncodingUtils.mustache Maven / Gradle / Ivy

package {{invokerPackage}};

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

/**
* Utilities to support Swagger encoding formats in Feign.
*/
public final class EncodingUtils {

  /**
   * Private constructor. Do not construct this class.
   */
  private EncodingUtils() {}

  /**
   * 

Encodes a collection of query parameters according to the Swagger * collection format.

* *

Of the various collection formats defined by Swagger ("csv", "tsv", * etc), Feign only natively supports "multi". This utility generates the * other format types so it will be properly processed by Feign.

* *

Note, as part of reformatting, it URL encodes the parameters as * well.

* @param parameters The collection object to be formatted. This object will * not be changed. * @param collectionFormat The Swagger collection format (eg, "csv", "tsv", * "pipes"). See the * * OpenAPI Spec for more details. * @return An object that will be correctly formatted by Feign. */ public static Object encodeCollection(Collection parameters, String collectionFormat) { if (parameters == null) { return parameters; } List stringValues = new ArrayList<>(parameters.size()); for (Object parameter : parameters) { // ignore null values (same behavior as Feign) if (parameter != null) { stringValues.add(encode(parameter)); } } // Feign natively handles single-element lists and the "multi" format. if (stringValues.size() < 2 || "multi".equals(collectionFormat)) { return stringValues; } // Otherwise return a formatted String String[] stringArray = stringValues.toArray(new String[0]); switch (collectionFormat) { case "csv": default: return StringUtil.join(stringArray, ","); case "ssv": return StringUtil.join(stringArray, " "); case "tsv": return StringUtil.join(stringArray, "\t"); case "pipes": return StringUtil.join(stringArray, "|"); } } /** * URL encode a single query parameter. * @param parameter The query parameter to encode. This object will not be * changed. * @return The URL encoded string representation of the parameter. If the * parameter is null, returns null. */ public static String encode(Object parameter) { if (parameter == null) { return null; } try { return URLEncoder.encode(parameter.toString(), "UTF-8").replaceAll("\\+", "%20"); } catch (UnsupportedEncodingException e) { // Should never happen, UTF-8 is always supported throw new RuntimeException(e); } } }




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