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OpenTracing 0.30 compatibility package

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/*
 * Copyright 2016-2017 The OpenTracing 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 io.opentracing.v_030.noop;

import io.opentracing.v_030.ActiveSpan;
import io.opentracing.v_030.Span;
import io.opentracing.v_030.SpanContext;
import io.opentracing.v_030.Tracer;
import io.opentracing.v_030.propagation.Format;

public interface NoopTracer extends Tracer {
}

final class NoopTracerImpl implements NoopTracer {
    final static NoopTracer INSTANCE = new NoopTracerImpl();

    @Override
    public SpanBuilder buildSpan(String operationName) { return NoopSpanBuilderImpl.INSTANCE; }

    @Override
    public  void inject(SpanContext spanContext, Format format, C carrier) {}

    @Override
    public  SpanContext extract(Format format, C carrier) { return NoopSpanBuilderImpl.INSTANCE; }

    @Override
    public String toString() { return NoopTracer.class.getSimpleName(); }

    @Override
    public ActiveSpan activeSpan() {
        return null;
    }

    @Override
    public ActiveSpan makeActive(Span span) {
        return NoopActiveSpanSource.NoopActiveSpan.INSTANCE;
    }
}