EmptyHttpHeaders.java — netty Source File

Source Code

/*
 * Copyright 2015 The Netty Project
 *
 * The Netty Project licenses this file to you 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:
 *
 *   https://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.netty.handler.codec.http;

import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Map.Entry;
import java.util.Set;

public class EmptyHttpHeaders extends HttpHeaders {
    static final Iterator<Entry<CharSequence, CharSequence>> EMPTY_CHARS_ITERATOR =
            Collections.<Entry<CharSequence, CharSequence>>emptyList().iterator();

    public static final EmptyHttpHeaders INSTANCE = instance();

    /**
     * @see InstanceInitializer#EMPTY_HEADERS
     * @deprecated Use {@link EmptyHttpHeaders#INSTANCE}
     * <p>
     * This is needed to break a cyclic static initialization loop between {@link HttpHeaders} and {@link
     * EmptyHttpHeaders}.
     */
    @Deprecated
    static EmptyHttpHeaders instance() {
        return InstanceInitializer.EMPTY_HEADERS;
    }

    protected EmptyHttpHeaders() {
    }

    @Override
    public String get(String name) {
        return null;
    }

    @Override
    public Integer getInt(CharSequence name) {
        return null;
    }

    @Override
    public int getInt(CharSequence name, int defaultValue) {
        return defaultValue;
    }

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