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/**
 * Copyright 2016 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;

final class NoopSpanBuilder implements Tracer.SpanBuilder {
    static final Tracer.SpanBuilder INSTANCE = new NoopSpanBuilder();

    private NoopSpanBuilder() {}

    @Override
    public Tracer.SpanBuilder addReference(String refType, SpanContext referenced) {
        return this;
    }

    @Override
    public Tracer.SpanBuilder asChildOf(SpanContext parent) {
        return this;
    }

    @Override
    public Tracer.SpanBuilder asChildOf(Span parent) {
        return this;
    }

    @Override
    public Tracer.SpanBuilder withTag(String key, String value) {
        return this;
    }

    @Override
    public Tracer.SpanBuilder withTag(String key, boolean value) {
        return this;
    }

    @Override
    public Tracer.SpanBuilder withTag(String key, Number value) {
        return this;
    }

    @Override
    public Tracer.SpanBuilder withStartTimestamp(long microseconds) {
        return this;
    }

    @Override
    public Span start() {
        return NoopSpan.INSTANCE;
    }
}