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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.
*/
/* $Rev$ $Date$ */
#ifndef tuscany_atom_hpp
#define tuscany_atom_hpp
/**
* ATOM data conversion functions.
*/
#include "string.hpp"
#include "list.hpp"
#include "value.hpp"
#include "monad.hpp"
#include "xml.hpp"
namespace tuscany {
namespace atom {
/**
* Tags used to tag feed and entry elements.
*/
const value feed("feed");
const value entry("entry");
/**
* Convert a list of elements to a list of element values representing an ATOM entry.
*/
const list<value> entryElementValues(const list<value>& e) {
const list<value> lt = filter<value>(selector(mklist<value>(element, "title")), e);
const value t = isNil(lt)? value(emptyString) : elementValue(car(lt));
const list<value> li = filter<value>(selector(mklist<value>(element, "id")), e);
const value i = isNil(li)? value(emptyString) : elementValue(car(li));
const list<value> lc = filter<value>(selector(mklist<value>(element, "content")), e);
return append<value>(list<value>() + element + entry
+ value(list<value>() + element + value("title") + t)
+ value(list<value>() + element + value("id") + i),
isNil(lc)? list<value>() : mklist<value>(value(list<value>() + element + value("content") + elementValue(car(lc)))));
}
/**
* Convert a list of elements to a list of element values representing ATOM entries.
*/
const list<value> entriesElementValues(const list<value>& e) {
if (isNil(e))
return e;
return cons<value>(entryElementValues(car(e)), entriesElementValues(cdr(e)));
}
/**
* Return true if a list of strings contains an ATOM feed.
*/
const bool isATOMFeed(const list<string>& ls) {
if (!isXML(ls))
return false;
return contains(car(ls), "<feed") && contains(car(ls), "=\"http://www.w3.org/2005/Atom\"");
}
/**
* Return true if a list of strings contains an ATOM entry.
*/
const bool isATOMEntry(const list<string>& ls) {
if (!isXML(ls))
return false;
return contains(car(ls), "<entry") && !contains(car(ls), "<feed") && contains(car(ls), "=\"http://www.w3.org/2005/Atom\"");
}
/**
* Convert a list of strings to a list of values representing an ATOM entry.
*/
const failable<list<value> > readATOMEntry(const list<string>& ilist) {
const list<value> e = readXML(ilist);
if (isNil(e))
return mkfailure<list<value> >("Empty entry");
return mklist<value>(entryElementValues(car(e)));
}
/**
* Convert a list of strings to a list of values representing an ATOM feed.
*/
const failable<list<value> > readATOMFeed(const list<string>& ilist) {
const list<value> f = readXML(ilist);
if (isNil(f))
return mkfailure<list<value> >("Empty feed");
const list<value> t = filter<value>(selector(mklist<value>(element, "title")), car(f));
const list<value> i = filter<value>(selector(mklist<value>(element, "id")), car(f));
const list<value> e = filter<value>(selector(mklist<value>(element, entry)), car(f));
return mklist<value>(append<value>(list<value>() + element + feed
+ value(list<value>() + element + value("title") + elementValue(car(t)))
+ value(list<value>() + element + value("id") + elementValue(car(i))),
entriesElementValues(e)));
}
/**
* Convert a list of element values representing an ATOM entry to a list of elements.
*/
const list<value> entryElement(const list<value>& l) {
const value title = elementValue(elementChild("title", l));
const value id = elementValue(elementChild("id", l));
const value content = elementChild("content", l);
const bool text = isNil(content)? false : elementHasValue(content);
return list<value>()
+ element + entry + (list<value>() + attribute + "xmlns" + "http://www.w3.org/2005/Atom")
+ (list<value>() + element + "title" + (list<value>() + attribute + "type" + "text") + title)
+ (list<value>() + element + "id" + id)
+ (isNil(content)?
list<value>() :
append<value>(list<value>() + element + "content" + (list<value>() + attribute + "type" + (text? "text" : "application/xml")),
text? mklist<value>(elementValue(content)) : elementChildren(content)))
+ (list<value>() + element + "link" + (list<value>() + attribute + "href" + id));
}
/**
* Convert a list of element values representing ATOM entries to a list of elements.
*/
const list<value> entriesElements(const list<value>& l) {
if (isNil(l))
return l;
return cons<value>(entryElement(car(l)), entriesElements(cdr(l)));
}
/**
* Convert a list of element values representing an ATOM entry to an ATOM entry.
*/
template<typename R> const failable<R> writeATOMEntry(const lambda<R(const string&, const R)>& reduce, const R& initial, const list<value>& ll) {
const list<value> l = isNil(ll)? ll : (list<value>)car(ll);
return writeXML<R>(reduce, initial, mklist<value>(entryElement(l)));
}
const failable<list<string> > writeATOMEntry(const list<value>& l) {
const failable<list<string> > ls = writeATOMEntry<list<string> >(rcons<string>, list<string>(), l);
if (!hasContent(ls))
return ls;
return reverse(list<string>(content(ls)));
}
/**
* Convert a list of element values representing an ATOM feed to an ATOM feed.
*/
template<typename R> const failable<R> writeATOMFeed(const lambda<R(const string&, const R)>& reduce, const R& initial, const list<value>& ll) {
const list<value> l = isNil(ll)? ll : (list<value>)car(ll);
const list<value> lt = filter<value>(selector(mklist<value>(element, "title")), l);
const value t = isNil(lt)? value(emptyString) : elementValue(car(lt));
const list<value> li = filter<value>(selector(mklist<value>(element, "id")), l);
const value i = isNil(li)? value(emptyString) : elementValue(car(li));
const list<value> f = list<value>()
+ element + feed + (list<value>() + attribute + "xmlns" + "http://www.w3.org/2005/Atom")
+ (list<value>() + element + "title" + (list<value>() + attribute + "type" + "text") + t)
+ (list<value>() + element + "id" + i);
// Write ATOM entries
const list<value> le = filter<value>(selector(mklist<value>(element, entry)), l);
if (isNil(le))
return writeXML<R>(reduce, initial, mklist<value>(f));
// Write a single ATOM entry element with a list of values
if (!isNil(le) && !isNil(car(le)) && isList(car<value>(caddr<value>(car(le))))) {
const list<value> fe = append(f, entriesElements(caddr<value>(car(le))));
return writeXML<R>(reduce, initial, mklist<value>(fe));
}
// Write separate ATOM entry elements
const list<value> fe = append(f, entriesElements(le));
return writeXML<R>(reduce, initial, mklist<value>(fe));
}
/**
* Convert a list of element values representing an ATOM feed to a list of strings.
*/
const failable<list<string> > writeATOMFeed(const list<value>& l) {
const failable<list<string> > ls = writeATOMFeed<list<string>>(rcons<string>, list<string>(), l);
if (!hasContent(ls))
return ls;
return reverse(list<string>(content(ls)));
}
}
}
#endif /* tuscany_atom_hpp */
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