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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
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package ch.boye.httpclientandroidlib.message;
import ch.boye.httpclientandroidlib.HeaderElement;
import ch.boye.httpclientandroidlib.NameValuePair;
import ch.boye.httpclientandroidlib.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.
*
* <p>
* 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.
* </p>
*
* @since 4.0
*/
public interface HeaderValueFormatter {
/**
* Formats an array of header elements.
*
* @param buffer the buffer to append to, or
* <code>null</code> to create a new buffer
* @param elems the header elements to format
* @param quote <code>true</code> to always format with quoted values,
* <code>false</code> to use quotes only when necessary
*
* @return a buffer with the formatted header elements.
* If the <code>buffer</code> argument was not <code>null</code>,
* 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</code> to create a new buffer
* @param elem the header element to format
* @param quote <code>true</code> to always format with quoted values,
* <code>false</code> to use quotes only when necessary
*
* @return a buffer with the formatted header element.
* If the <code>buffer</code> argument was not <code>null</code>,
* 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 <i>not</i> generate a leading semicolon.
*
* @param buffer the buffer to append to, or
* <code>null</code> to create a new buffer
* @param nvps the parameters (name-value pairs) to format
* @param quote <code>true</code> to always format with quoted values,
* <code>false</code> to use quotes only when necessary
*
* @return a buffer with the formatted parameters.
* If the <code>buffer</code> argument was not <code>null</code>,
* 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</code> to create a new buffer
* @param nvp the name-value pair to format
* @param quote <code>true</code> to always format with a quoted value,
* <code>false</code> to use quotes only when necessary
*
* @return a buffer with the formatted name-value pair.
* If the <code>buffer</code> argument was not <code>null</code>,
* that buffer will be used and returned.
*/
CharArrayBuffer formatNameValuePair(CharArrayBuffer buffer,
NameValuePair nvp,
boolean quote);
}
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