com.google.api.generator.gapic.protoparser.PatternParser Maven / Gradle / Ivy
// Copyright 2022 Google LLC
//
// 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 com.google.api.generator.gapic.protoparser;
import com.google.api.pathtemplate.PathTemplate;
import com.google.common.collect.ImmutableSortedSet;
import java.util.Set;
public class PatternParser {
// This method tries to parse all named segments from pattern and sort in natual order
// e.g. /v1beta1/{table_name=tests/*}/{routing_id=instances/*}/** -> (routing_id, table_name)
public static Set getPatternBindings(String pattern) {
ImmutableSortedSet.Builder bindings = ImmutableSortedSet.naturalOrder();
if (pattern.isEmpty()) {
return bindings.build();
}
PathTemplate template = PathTemplate.create(pattern);
// Filter out any unbound variable like "$0, $1, etc.
template.vars().stream().filter(s -> !s.contains("$")).forEach(bindings::add);
return bindings.build();
}
}