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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.Span;
import io.opentracing.v_030.SpanContext;

import java.util.Map;

public interface NoopSpan extends Span {
    static final NoopSpan INSTANCE = new NoopSpanImpl();
}

final class NoopSpanImpl implements NoopSpan {

    @Override
    public SpanContext context() { return NoopSpanContextImpl.INSTANCE; }

    @Override
    public void finish() {}

    @Override
    public void finish(long finishMicros) {}

    @Override
    public NoopSpan setTag(String key, String value) { return this; }

    @Override
    public NoopSpan setTag(String key, boolean value) { return this; }

    @Override
    public NoopSpan setTag(String key, Number value) { return this; }

    @Override
    public NoopSpan log(Map fields) { return this; }

    @Override
    public NoopSpan log(long timestampMicroseconds, Map fields) { return this; }

    @Override
    public NoopSpan log(String event) { return this; }

    @Override
    public NoopSpan log(long timestampMicroseconds, String event) { return this; }

    @Override
    public NoopSpan setBaggageItem(String key, String value) { return this; }

    @Override
    public String getBaggageItem(String key) { return null; }

    @Override
    public NoopSpan setOperationName(String operationName) { return this; }

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