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QueryTemplate.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.template;
import feign.CollectionFormat;
import feign.Util;
import feign.template.Template.EncodingOptions;
import feign.template.Template.ExpansionOptions;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.stream.Collectors;
import java.util.stream.StreamSupport;
/** Template for a Query String parameter. */
public final class QueryTemplate {
private static final String UNDEF = "undef";
private List<Template> values;
private final Template name;
private final CollectionFormat collectionFormat;
private boolean pure = false;
/**
* Create a new Query Template.
*
* @param name of the query parameter.
* @param values in the template.
* @param charset for the template.
* @return a QueryTemplate.
*/
public static QueryTemplate create(String name, Iterable<String> values, Charset charset) {
return create(name, values, charset, CollectionFormat.EXPLODED, true);
}
public static QueryTemplate create(
String name, Iterable<String> values, Charset charset, CollectionFormat collectionFormat) {
return create(name, values, charset, collectionFormat, true);
}
/**
* Create a new Query Template.
*
* @param name of the query parameter.
* @param values in the template.
* @param charset for the template.
* @param collectionFormat to use.
* @param decodeSlash if slash characters should be decoded
* @return a QueryTemplate
*/
public static QueryTemplate create(
String name,
Iterable<String> values,
Charset charset,
CollectionFormat collectionFormat,
boolean decodeSlash) {
if (Util.isBlank(name)) {
throw new IllegalArgumentException("name is required.");
}
if (values == null) {
throw new IllegalArgumentException("values are required");
}
/* remove all empty values from the array */
Collection<String> remaining =
StreamSupport.stream(values.spliterator(), false)
.filter(Util::isNotBlank)
.collect(Collectors.toList());
return new QueryTemplate(name, remaining, charset, collectionFormat, decodeSlash);
}
/**
* Append a value to the Query Template.
*
* @param queryTemplate to append to.
* @param values to append.
* @return a new QueryTemplate with value appended.
*/
public static QueryTemplate append(
QueryTemplate queryTemplate,
Iterable<String> values,
CollectionFormat collectionFormat,
boolean decodeSlash) {
List<String> queryValues = new ArrayList<>(queryTemplate.getValues());
queryValues.addAll(
StreamSupport.stream(values.spliterator(), false)
.filter(Util::isNotBlank)
.collect(Collectors.toList()));
return create(
queryTemplate.getName(),
queryValues,
StandardCharsets.UTF_8,
collectionFormat,
decodeSlash);
}
/**
* Create a new Query Template.
*
* @param name of the query parameter.
* @param values for the parameter.
* @param collectionFormat to use.
*/
private QueryTemplate(
String name,
Iterable<String> values,
Charset charset,
CollectionFormat collectionFormat,
boolean decodeSlash) {
this.values = new CopyOnWriteArrayList<>();
this.name =
new Template(
name,
ExpansionOptions.ALLOW_UNRESOLVED,
EncodingOptions.REQUIRED,
!decodeSlash,
charset);
this.collectionFormat = collectionFormat;
/* parse each value into a template chunk for resolution later */
for (String value : values) {
if (value.isEmpty()) {
/* skip */
continue;
}
this.values.add(
new Template(
value, ExpansionOptions.REQUIRED, EncodingOptions.REQUIRED, !decodeSlash, charset));
}
if (this.values.isEmpty()) {
/* in this case, we have a pure parameter */
this.pure = true;
}
}
public List<String> getValues() {
return Collections.unmodifiableList(
this.values.stream().map(Template::toString).collect(Collectors.toList()));
}
public List<String> getVariables() {
List<String> variables = new ArrayList<>(this.name.getVariables());
for (Template template : this.values) {
variables.addAll(template.getVariables());
}
return Collections.unmodifiableList(variables);
}
public String getName() {
return name.toString();
}
@Override
public String toString() {
return this.queryString(this.name.toString(), this.getValues());
}
/**
* Expand this template. Unresolved variables are removed. If all values remain unresolved, the
* result is an empty string.
*
* @param variables containing the values for expansion.
* @return the expanded template.
*/
public String expand(Map<String, ?> variables) {
String name = this.name.expand(variables);
if (this.pure) {
return name;
}
List<String> expanded = new ArrayList<>();
for (Template template : this.values) {
String result = template.expand(variables);
if (result == null) {
continue;
}
/*
* check for an iterable result, and if one is there, we need to split it into individual
* values
*/
if (result.contains(",")) {
/* we need to split it */
expanded.addAll(Arrays.asList(result.split(",")));
} else {
expanded.add(result);
}
}
return this.queryString(name, Collections.unmodifiableList(expanded));
}
private String queryString(String name, List<String> values) {
if (this.pure) {
return name;
}
if (!values.isEmpty()) {
return this.collectionFormat.join(name, values, StandardCharsets.UTF_8).toString();
}
/* nothing to return, all values are unresolved */
return null;
}
}