package com.dbxml.labrador.http;
/*
* The dbXML Labrador Software License, Version 1.0
*
*
* Copyright (c) 2003 The dbXML Group, L.L.C. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by The
* dbXML Group, L.L.C. (http://www.dbxml.com/)."
* Alternately, this acknowledgment may appear in the software
* itself, if and wherever such third-party acknowledgments normally
* appear.
*
* 4. The names "Labrador" and "dbXML Group" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* info@dbxml.com
*
* 5. Products derived from this software may not be called "Labrador",
* nor may "Labrador" appear in their name, without prior written
* permission of The dbXML Group, L.L.C..
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 DBXML GROUP, L.L.C. OR ITS
* 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.
* ====================================================================
*
* $Id: HTTPProxyResolver.java,v 1.1 2003/10/07 00:11:05 bradford Exp $
*/
import com.dbxml.labrador.Discovery;
import com.dbxml.labrador.ID;
import com.dbxml.labrador.Instance;
import com.dbxml.labrador.Resolver;
import com.dbxml.labrador.configuration.Configuration;
import com.dbxml.labrador.configuration.ConfigurationCallback;
import com.dbxml.labrador.configuration.ConfigurationException;
import com.dbxml.labrador.objects.ObjectInstance;
import com.dbxml.labrador.util.SimpleConfigurable;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
/**
* HTTPProxyResolver is a utility Resolver that performs simple HTTP
* proxying.
*/
public final class HTTPProxyResolver extends SimpleConfigurable implements Resolver {
private static final String ALIAS = "alias";
private static final String URI = "uri";
private static final String HEADER = "header";
private static final String NAME = "name";
private static final String VALUE = "value";
private Map aliases = Collections.synchronizedMap(new HashMap());
public HTTPProxyResolver() {
}
public void setConfig(Configuration config) throws ConfigurationException {
super.setConfig(config);
config.processChildren(ALIAS, new ConfigurationCallback() {
public void process(Configuration cfg) throws ConfigurationException {
String alias = cfg.getAttribute(NAME);
String uri = cfg.getAttribute(URI);
if ( !uri.endsWith("/") )
uri = uri + "/";
AliasInfo info = new AliasInfo(uri);
aliases.put(alias, info);
final Map headers = info.getHeaders();
cfg.processChildren(HEADER, new ConfigurationCallback() {
public void process(Configuration c) {
String name = c.getAttribute(NAME);
String value = c.getAttribute(VALUE);
headers.put(name, value);
}
});
}
});
}
public boolean isIDValid(ID id) {
String[] components = id.getComponents();
return components.length == 2 && aliases.get(components[0]) != null;
}
public Instance getInstance(ID id) {
return getObjectInstance(id);
}
public Discovery getDiscovery(ID id) {
ObjectInstance instance = getObjectInstance(id);
if ( instance != null )
return instance.getDiscovery();
else
return null;
}
public ObjectInstance getObjectInstance(ID id) {
String[] components = id.getComponents();
if ( components.length != 2 )
return null;
String aliasName = components[0];
String docName = components[1];
AliasInfo info = (AliasInfo)aliases.get(aliasName);
if ( info != null ) {
Object instance = new HTTPProxyInstance(info.getURI()+docName, info.getHeaders());
return new ObjectInstance(instance);
}
else
return null;
}
/**
* AliasInfo
*/
private class AliasInfo {
public String uri;
public Map headers = Collections.synchronizedMap(new HashMap());
public AliasInfo(String uri) {
this.uri = uri;
}
public String getURI() {
return uri;
}
public Map getHeaders() {
return headers;
}
}
}