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HttpJsonHeaderInterceptor.java
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HttpJsonHeaderInterceptor.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.httpjson;
import com.google.api.gax.httpjson.ForwardingHttpJsonClientCall.SimpleForwardingHttpJsonClientCall;
import com.google.common.collect.ImmutableMap;
import java.util.Map;
/**
* An interceptor to handle custom headers.
*
* <p>Package-private for internal usage.
*/
class HttpJsonHeaderInterceptor implements HttpJsonClientInterceptor {
private final Map<String, String> staticHeaders;
public HttpJsonHeaderInterceptor(Map<String, String> staticHeaders) {
this.staticHeaders = staticHeaders;
}
@Override
public <ReqT, RespT> HttpJsonClientCall<ReqT, RespT> interceptCall(
ApiMethodDescriptor<ReqT, RespT> method,
final HttpJsonCallOptions callOptions,
HttpJsonChannel next) {
HttpJsonClientCall<ReqT, RespT> call = next.newCall(method, callOptions);
return new SimpleForwardingHttpJsonClientCall<ReqT, RespT>(call) {
@Override
public void start(
HttpJsonClientCall.Listener<RespT> responseListener, HttpJsonMetadata headers) {
Map<String, Object> mergedHeaders =
ImmutableMap.<String, Object>builder()
.putAll(headers.getHeaders())
.putAll(staticHeaders)
.build();
super.start(responseListener, headers.toBuilder().setHeaders(mergedHeaders).build());
}
};
}
}