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CollectionFormat.java
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/*
* Copyright © 2012 The Feign Authors (feign@commonhaus.dev)
*
* 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 feign;
import feign.template.UriUtils;
import java.nio.charset.Charset;
import java.util.Collection;
/**
* Various ways to encode collections in URL parameters.
*
* <p>These specific cases are inspired by the <a href="http://swagger.io/specification/">OpenAPI
* specification</a>.
*/
public enum CollectionFormat {
/** Comma separated values, eg foo=bar,baz */
CSV(","),
/** Space separated values, eg foo=bar baz */
SSV(" "),
/** Tab separated values, eg foo=bar[tab]baz */
TSV("\t"),
/** Values separated with the pipe (|) character, eg foo=bar|baz */
PIPES("|"),
/** Parameter name repeated for each value, eg foo=bar&foo=baz */
// Using null as a special case since there is no single separator character
EXPLODED(null);
private final String separator;
CollectionFormat(String separator) {
this.separator = separator;
}
/**
* Joins the field and possibly multiple values with the given separator.
*
* <p>Calling EXPLODED.join("foo", ["bar"]) will return "foo=bar".
*
* <p>Calling CSV.join("foo", ["bar", "baz"]) will return "foo=bar,baz".
*
* <p>Null values are treated somewhat specially. With EXPLODED, the field is repeated without any
* "=" for backwards compatibility. With all other formats, null values are not included in the
* joined value list.
*
* @param field The field name corresponding to these values.
* @param values A collection of value strings for the given field.
* @param charset to encode the sequence
* @return The formatted char sequence of the field and joined values. If the value collection is
* empty, an empty char sequence will be returned.
*/
public CharSequence join(String field, Collection<String> values, Charset charset) {
StringBuilder builder = new StringBuilder();
int valueCount = 0;
for (String value : values) {
if (separator == null) {
// exploded
builder.append(valueCount++ == 0 ? "" : "&");
builder.append(UriUtils.encode(field, charset));
if (value != null) {
builder.append('=');
builder.append(value);
}
} else {
// delimited with a separator character
if (builder.length() == 0) {
builder.append(UriUtils.encode(field, charset));
}
if (value == null) {
continue;
}
builder.append(valueCount++ == 0 ? "=" : UriUtils.encode(separator, charset));
builder.append(value);
}
}
return builder;
}
}