AcceptOnlyBinaryFramesFilter.java

/*
 * Copyright 2015 Netflix, Inc.
 *
 * 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.reactivex.netty.examples.http.ws.messaging;

import io.netty.handler.codec.http.websocketx.BinaryWebSocketFrame;
import io.netty.handler.codec.http.websocketx.WebSocketFrame;
import rx.functions.Func1;

public class AcceptOnlyBinaryFramesFilter implements Func1<WebSocketFrame, Boolean> {

    public static final AcceptOnlyBinaryFramesFilter INSTANCE = new AcceptOnlyBinaryFramesFilter();

    private AcceptOnlyBinaryFramesFilter() {
    }

    @Override
    public Boolean call(WebSocketFrame f) {
        if (f instanceof BinaryWebSocketFrame) {
            return true;
        } else {
            f.release();
            return false;
        }
    }
}