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HeaderTemplate.java
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/**
* Copyright 2012-2019 The Feign 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 feign.template;
import feign.Util;
import java.nio.charset.Charset;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.stream.Collectors;
import java.util.stream.StreamSupport;
/**
* Template for HTTP Headers. Variables that are unresolved are ignored and Literals are not
* encoded.
*/
public final class HeaderTemplate extends Template {
/* cache a copy of the variables for lookup later */
private LinkedHashSet<String> values;
private String name;
public static HeaderTemplate create(String name, Iterable<String> values) {
if (name == null || name.isEmpty()) {
throw new IllegalArgumentException("name is required.");
}
if (values == null) {
throw new IllegalArgumentException("values are required");
}
/* construct a uri template from the name and values */
StringBuilder template = new StringBuilder();
template.append(name)
.append(" ");
/* create a comma separated template for the header values */
Iterator<String> iterator = values.iterator();
while (iterator.hasNext()) {
template.append(iterator.next());
if (iterator.hasNext()) {
template.append(", ");
}
}
return new HeaderTemplate(template.toString(), name, values, Util.UTF_8);
}
/**
* Append values to a Header Template.
*
* @param headerTemplate to append to.
* @param values to append.
* @return a new Header Template with the values added.
*/
public static HeaderTemplate append(HeaderTemplate headerTemplate, Iterable<String> values) {
LinkedHashSet<String> headerValues = new LinkedHashSet<>(headerTemplate.getValues());
headerValues.addAll(StreamSupport.stream(values.spliterator(), false)
.filter(Util::isNotBlank)
.collect(Collectors.toCollection(LinkedHashSet::new)));
return create(headerTemplate.getName(), headerValues);
}
/**
* Creates a new Header Template.
*
* @param template to parse.
*/
private HeaderTemplate(String template, String name, Iterable<String> values, Charset charset) {
super(template, ExpansionOptions.REQUIRED, EncodingOptions.NOT_REQUIRED, false, charset);
this.values = StreamSupport.stream(values.spliterator(), false)
.filter(Util::isNotBlank)
.collect(Collectors.toCollection(LinkedHashSet::new));
this.name = name;
}
public Collection<String> getValues() {
return Collections.unmodifiableCollection(values);
}
public String getName() {
return name;
}
}