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Expression.java
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74 lines (64 loc) · 1.84 KB
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/**
* Copyright 2012-2020 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 java.util.Optional;
import java.util.regex.Pattern;
/**
* URI Template Expression.
*/
abstract class Expression implements TemplateChunk {
private String name;
private Pattern pattern;
/**
* Create a new Expression.
*
* @param name of the variable
* @param pattern the resolved variable must adhere to, optional.
*/
Expression(String name, String pattern) {
this.name = name;
Optional.ofNullable(pattern).ifPresent(s -> this.pattern = Pattern.compile(s));
}
abstract String expand(Object variable, boolean encode);
public String getName() {
return this.name;
}
Pattern getPattern() {
return pattern;
}
/**
* Checks if the provided value matches the variable pattern, if one is defined. Always true if no
* pattern is defined.
*
* @param value to check.
* @return true if it matches.
*/
boolean matches(String value) {
if (pattern == null) {
return true;
}
return pattern.matcher(value).matches();
}
@Override
public String getValue() {
if (this.pattern != null) {
return "{" + this.name + ":" + this.pattern + "}";
}
return "{" + this.name + "}";
}
@Override
public String toString() {
return this.getValue();
}
}