Headers.java — netty Source File

Source Code

/*
 * Copyright 2014 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;

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

/**
 * Common interface for {@link Headers} which represents a mapping of key to value.
 * Duplicate keys may be allowed by implementations.
 *
 * @param <K> the type of the header name.
 * @param <V> the type of the header value.
 * @param <T> the type to use for return values when the intention is to return {@code this} object.
 */
public interface Headers<K, V, T extends Headers<K, V, T>> extends Iterable<Entry<K, V>> {
    /**
     * Returns the value of a header with the specified name. If there is more than one value for the specified name,
     * the first value in insertion order is returned.
     *
     * @param name the name of the header to retrieve
     * @return the first header value if the header is found. {@code null} if there's no such header
     */
    V get(K name);

    /**
     * Returns the value of a header with the specified name. If there is more than one value for the specified name,
     * the first value in insertion order is returned.
     *
     * @param name the name of the header to retrieve
     * @param defaultValue the default value
     * @return the first header value or {@code defaultValue} if there is no such header
     */
    V get(K name, V defaultValue);

    /**
     * Returns the value of a header with the specified name and removes it from this object. If there is more than
     * one value for the specified name, the first value in insertion order is returned.
     *
     * @param name the name of the header to retrieve
     * @return the first header value or {@code null} if there is no such header
     */
    V getAndRemove(K name);

    /**
     * Returns the value of a header with the specified name and removes it from this object. If there is more than
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