Configuration.cc

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/*
 * Configuration.cc
 *
 * Smalltalk like class library for C++
 * Application configuration holder.
 *
 * Copyright (c) 2004 Milan Cermak, Petr Stepanek
 */
/*
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <stlib/Dictionary.h>
#include <stlib/KAVIterator.h>
#include <stlib/Set.h>
#include <stlib/String.h>

#include <stlib/tools/ConfigurationReader.h>
#include <stlib/tools/Configuration.h>

namespace Tools {

Dictionary *Configuration::_instances = nil;
ConfigurationReader *Configuration::_reader = nil;

Configuration::Configuration(void)
{
    bindings = new Dictionary(2);
}

Configuration::Configuration(String *name)
{
    bindings = new Dictionary(2);
    instances()->put(name, this);
}

Configuration::~Configuration(void)
{
    Object *key = instances()->keyAtValue(this, nil);
    if (key != nil) instances()->removeKey(key);
    delete bindings;
}

/* Instance creation protocol */
Object *Configuration::namedAt(String *name, String *item)
{
    Configuration *config = named(name);
    return config->at(item);
}

Configuration *Configuration::named(String *name)
{
    Configuration *configuration;
    configuration = dynamic_cast<Configuration *>(instances()->at(name, nil));
    if (configuration == nil) {
        configuration = Configuration::fromFile(name);
        instances()->put(name, configuration);
    }
    return configuration;
}

Configuration *Configuration::fromFile(String *filename)
{
    configurationReader()->onFilename(filename);
    return configurationReader()->readConfiguration();
}

/* Class-accessing protocol */

String *Configuration::className(void) const
{
    return new String("Configuration");
}

ConfigurationReader *Configuration::configurationReader(void)
{
    if (_reader == nil)
        _reader = new ConfigurationReader;
    return _reader;
}

void Configuration::configurationReader(ConfigurationReader *reader)
{
    _reader = reader;
}

Dictionary *Configuration::instances(void)
{
    if (_instances == nil)
        _instances = new Dictionary(2);
    return _instances;
}

/* Accessing protocol */
Object *Configuration::at(String *key)
{
    return bindings->at(key);
}

Object *Configuration::at(const char *key)
{
    return bindings->at(key);
}

Object *Configuration::at(String *key, Object *ifAbsentValue)
{
    return bindings->at(key, ifAbsentValue);
}

Object *Configuration::at(const char *key, const char *ifAbsentValue)
{
    return bindings->at(key, ifAbsentValue);
}

void Configuration::put(String *key, Object *value)
{
    bindings->put(key, value);
}

Set *Configuration::keys(void)
{
    KeysAndValuesIterator *i;
    Set *coll = new Set(bindings->size());
    for (i = bindings->keysAndValuesIterator(); !i->finished(); i->next()) {
        coll->add(i->key());
    }
    return coll;
}

/* Printing protocol */
void Configuration::printOn(Stream *stream) const
{
    Object::printOn(stream);
    stream->nextPut('{');
    stream->print(bindings);
    stream->nextPut('}');
}

/* Removing protocol */
Object *Configuration::removeKey(String *key)
{
    return bindings->removeKey(key);
}

/* Testing protocol */
bool Configuration::includesKey(String *key)
{
    return bindings->includesKey(key);
}

bool Configuration::isEmpty(void)
{
    return bindings->isEmpty();
}

/* Utilities protocol */
void Configuration::reloadAll(void)
{
    KeysAndValuesIterator *i;

    for (i = instances()->keysAndValuesIterator(); !i->finished(); i->next()) {
        configurationReader()->onFilename(dynamic_cast<String *>(i->key()));
        configurationReader()->readConfiguration(dynamic_cast<Configuration *>(i->value()));
    }
}

}; /* namespace Tools */

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