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/*
* QueryCombiner.java May 2003
*
* Copyright (C) 2003, Niall Gallagher <niallg@users.sf.net>
*
* Licensed 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.
*/
package org.simpleframework.http.core;
import java.util.List;
import java.util.Set;
import org.simpleframework.http.Query;
import org.simpleframework.http.parse.QueryParser;
/**
* The <code>QueryCombimer</code> is used to parse several strings
* as a complete URL encoded parameter string. This will do the
* following concatenations.
*
* <pre>
* null + "a=b&c=d&e=f" = "a=b&c=d&e=f"
* "a=b" + "e=f&g=h" = "a=b&e=f&g=h";
* "a=b&c=d&e=f" + "" = "a=b&c=d&e=f"
* </pre>
*
* This ensures that the <code>QueryForm</code> can parse the list
* of strings as a single URL encoded parameter string. This can
* parse any number of parameter strings.
*
* @author Niall Gallagher
*/
class QueryCombiner extends QueryParser {
/**
* Constructor that allows a list of string objects to be
* parsed as a single parameter string. This will check
* each string to see if it is empty, that is, is either
* null or the zero length string.
*
* @param list this is a list of query values to be used
*/
public QueryCombiner(String... list) {
this.parse(list);
}
/**
* Constructor that allows an array of string objects to
* be parsed as a single parameter string. This will check
* each string to see if it is empty, that is, is either
* null or the zero length string.
*
* @param query this is the query from the HTTP header
* @param list this is the list of strings to be parsed
*/
public QueryCombiner(Query query, String... list) {
this.add(query);
this.parse(list);
}
/**
* Constructor that allows an array of string objects to
* be parsed as a single parameter string. This will check
* each string to see if it is empty, that is, is either
* null or the zero length string.
*
* @param query this is the query from the HTTP header
* @param post this is the query from the HTTP post body
*/
public QueryCombiner(Query query, Query post) {
this.add(query);
this.add(post);
}
/**
* This will concatenate the list of parameter strings as a
* single parameter string, before handing it to be parsed
* by the <code>parse(String)</code> method. This method
* will ignore any null or zero length strings in the array.
*
* @param list this is the list of strings to be parsed
*/
public void parse(String[] list) {
StringBuilder text = new StringBuilder();
for(int i = 0; i < list.length; i++) {
if(list[i] == null) {
continue;
} else if(list[i].length()==0){
continue;
} else if(text.length() > 0){
text.append("&");
}
text.append(list[i]);
}
parse(text);
}
/**
* This is used to perform a parse of the form data that is in
* the provided string builder. This will simply convert the
* data in to a string and parse it in the normal fashion.
*
* @param text this is the buffer to be converted to a string
*/
private void parse(StringBuilder text) {
if(text != null){
ensureCapacity(text.length());
count = text.length();
text.getChars(0, count, buf,0);
parse();
}
}
/**
* This method is used to insert a collection of tokens into
* the parsers map. This is used when another source of tokens
* is required to populate the connection currently maintained
* within this parsers internal map. Any tokens that currently
* exist with similar names will be overwritten by this.
*
* @param query this is the collection of tokens to be added
*/
private void add(Query query) {
Set<String> keySet = query.keySet();
for(String key : keySet) {
List<String> list = query.getAll(key);
String first = query.get(key);
if(first != null) {
all.put(key, list);
map.put(key, first);
}
}
}
}
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