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/*
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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
 *
 *   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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
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 * .
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package org.apache.http.message;

import org.apache.http.HeaderElement;
import org.apache.http.NameValuePair;
import org.apache.http.util.CharArrayBuffer;

/**
 * Interface for formatting elements of a header value.
 * This is the complement to {@link HeaderValueParser}.
 * Instances of this interface are expected to be stateless and thread-safe.
 *
 * 

* All formatting methods accept an optional buffer argument. * If a buffer is passed in, the formatted element will be appended * and the modified buffer is returned. If no buffer is passed in, * a new buffer will be created and filled with the formatted element. * In both cases, the caller is allowed to modify the returned buffer. *

* * @since 4.0 */ public interface HeaderValueFormatter { /** * Formats an array of header elements. * * @param buffer the buffer to append to, or * {@code null} to create a new buffer * @param elems the header elements to format * @param quote {@code true} to always format with quoted values, * {@code false} to use quotes only when necessary * * @return a buffer with the formatted header elements. * If the {@code buffer} argument was not {@code null}, * that buffer will be used and returned. */ CharArrayBuffer formatElements(CharArrayBuffer buffer, HeaderElement[] elems, boolean quote); /** * Formats one header element. * * @param buffer the buffer to append to, or * {@code null} to create a new buffer * @param elem the header element to format * @param quote {@code true} to always format with quoted values, * {@code false} to use quotes only when necessary * * @return a buffer with the formatted header element. * If the {@code buffer} argument was not {@code null}, * that buffer will be used and returned. */ CharArrayBuffer formatHeaderElement(CharArrayBuffer buffer, HeaderElement elem, boolean quote); /** * Formats the parameters of a header element. * That's a list of name-value pairs, to be separated by semicolons. * This method will not generate a leading semicolon. * * @param buffer the buffer to append to, or * {@code null} to create a new buffer * @param nvps the parameters (name-value pairs) to format * @param quote {@code true} to always format with quoted values, * {@code false} to use quotes only when necessary * * @return a buffer with the formatted parameters. * If the {@code buffer} argument was not {@code null}, * that buffer will be used and returned. */ CharArrayBuffer formatParameters(CharArrayBuffer buffer, NameValuePair[] nvps, boolean quote); /** * Formats one name-value pair, where the value is optional. * * @param buffer the buffer to append to, or * {@code null} to create a new buffer * @param nvp the name-value pair to format * @param quote {@code true} to always format with a quoted value, * {@code false} to use quotes only when necessary * * @return a buffer with the formatted name-value pair. * If the {@code buffer} argument was not {@code null}, * that buffer will be used and returned. */ CharArrayBuffer formatNameValuePair(CharArrayBuffer buffer, NameValuePair nvp, boolean quote); }




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