/*
 * Copyright 2017, TeamDev Ltd. All rights reserved.
 *
 * Redistribution and use in source and/or binary forms, with or without
 * modification, must retain the above copyright notice and the following
 * disclaimer.
 *
 * 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 io.spine.server.commandbus;

import com.google.common.base.Predicate;
import io.grpc.stub.StreamObserver;
import io.spine.base.Command;
import io.spine.base.MessageAcked;
import io.spine.envelope.CommandEnvelope;

import javax.annotation.Nullable;

import static com.google.common.base.Preconditions.checkNotNull;

/**
 * A predicate on {@link CommandEnvelope} matching it to a {@link CommandBusFilter}.
 *
 * <p>The filter receives the given {@link StreamObserver} for either acknowledging the Command
 * posting or emitting an error.
 *
 * @author Dmytro Dashenkov
 */
final class CommandBusFilterPredicate implements Predicate<CommandEnvelope> {

    private final CommandBusFilter filter;
    private final StreamObserver<MessageAcked> responseObserver;

    CommandBusFilterPredicate(CommandBusFilter filter,
                              StreamObserver<MessageAcked> errorObserver) {
        this.filter = filter;
        this.responseObserver = errorObserver;
    }

    @Override
    public boolean apply(@Nullable CommandEnvelope input) {
        checkNotNull(input);
        final boolean result = filter.accept(input, responseObserver);
        return result;
    }
}

@@ -1128,38 +1128,8 @@
 er;%0A
-import io.spine.base.Command;%0A
 impo

Remove redundant import.