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/*
* ====================================================================
* Project: openMDX/Core, http://www.openmdx.org/
* Description: HTTP Header Field Value
* Owner: OMEX AG, Switzerland, http://www.omex.ch
* ====================================================================
*
* This software is published under the BSD license as listed below.
*
* Copyright (c) 2010, OMEX AG, Switzerland
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* * Neither the name of the openMDX team nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* ------------------
*
* This product includes software developed by other organizations as
* listed in the NOTICE file.
*/
package org.openmdx.base.io;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
/**
* Parse HTTP Headers
*/
public class HttpHeaderFieldValue implements Iterable{
/**
* Constructor
*
* @param headers
*/
public HttpHeaderFieldValue(
Enumeration headers
){
List values = new ArrayList();
while(headers.hasMoreElements()) {
String value = headers.nextElement().toString();
int begin = 0;
for(
int end = value.indexOf(',');
end >= 0;
begin = end + 1, end = value.indexOf(',', begin)
){
values.add(value.substring(begin, end).trim());
}
values.add(value.substring(begin).trim());
}
float minorOrder = 0.0f;
for(String value : values) {
this.content.add(
new HttpHeaderFieldContent(
value,
minorOrder
)
);
minorOrder += 1.0 / 1048576.0;
}
Collections.sort(this.content);
}
/**
* The parsed and sorted list of headers
*/
private final List content = new ArrayList();
/* (non-Javadoc)
* @see java.lang.Iterable#iterator()
*/
// @Override
public Iterator iterator() {
return this.content.iterator();
}
/**
* This method inspects the q parameter
*
* @param defaultValue the default value is returned in case of an empty enumeration
*
* @return the value of the header with the highest priority
*/
public HttpHeaderFieldContent getPreferredContent(
String defaultContent
){
return this.content.isEmpty() ? (
defaultContent == null ? null : new HttpHeaderFieldContent(defaultContent, 1.0f)
) : this.content.get(0);
}
/* (non-Javadoc)
* @see java.lang.Object#toString()
*/
@Override
public String toString(
) {
return this.content.toString();
}
/**
* Tells whether there is no content
*
* @return true if there is no content
*/
public boolean isEmpty(){
return this.content.isEmpty();
}
}
