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RequestParamsBuilder.java
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RequestParamsBuilder.java
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/*
* Copyright 2022 Google LLC
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google LLC nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.google.api.gax.rpc;
import com.google.api.core.BetaApi;
import com.google.api.pathtemplate.PathTemplate;
import com.google.common.collect.ImmutableMap;
import java.util.Map;
/**
* This builder class builds a request params map that will be used by autogenerated implementation
* of {@link RequestParamsExtractor}.
*/
@BetaApi
public class RequestParamsBuilder {
private final ImmutableMap.Builder<String, String> paramsBuilder;
private RequestParamsBuilder() {
this.paramsBuilder = ImmutableMap.builder();
}
public static RequestParamsBuilder create() {
return new RequestParamsBuilder();
}
/**
* Add an entry to paramsBuilder by match-and-extract field values from requests based on
* pre-configured path templates. This method is called repeatedly for each configured routing
* rule parameter, it's possible that the incoming field value from request is null or there is no
* matches found, we'll continue the match-and-extract process for the next routing rule parameter
* in such case.
*
* @param fieldValue the field value from a request
* @param headerKey the header key for the routing header param
* @param pathTemplate {@link PathTemplate} the path template used for match-and-extract
*/
public void add(String fieldValue, String headerKey, PathTemplate pathTemplate) {
if (fieldValue == null) {
return;
}
Map<String, String> matchedValues = pathTemplate.match(fieldValue);
if (matchedValues != null && matchedValues.containsKey(headerKey)) {
paramsBuilder.put(headerKey, matchedValues.get(headerKey));
}
}
public Map<String, String> build() {
return paramsBuilder.build();
}
}