org.apache.stanbol.entityhub.core.site.AbstractEntitySearcher Maven / Gradle / Ivy
/*
* 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.
*/
package org.apache.stanbol.entityhub.core.site;
import static org.apache.stanbol.entityhub.servicesapi.site.EntityDereferencer.ACCESS_URI;
import static org.apache.stanbol.entityhub.servicesapi.site.EntitySearcher.QUERY_URI;
import java.util.Dictionary;
import org.apache.felix.scr.annotations.Activate;
import org.apache.felix.scr.annotations.Deactivate;
import org.apache.felix.scr.annotations.Property;
import org.apache.stanbol.entityhub.servicesapi.site.EntityDereferencer;
import org.apache.stanbol.entityhub.servicesapi.site.SiteConfiguration;
import org.apache.stanbol.entityhub.servicesapi.site.EntitySearcher;
import org.osgi.service.component.ComponentContext;
import org.slf4j.Logger;
@Property(name=QUERY_URI)
public abstract class AbstractEntitySearcher implements EntitySearcher {
protected final Logger log;
protected AbstractEntitySearcher(Logger log){
this.log = log;
log.info("create instance of "+this.getClass().getName());
}
private String queryUri;
private String baseUri;
private Dictionary config;
private ComponentContext context;
protected final String getQueryUri() {
return queryUri;
}
/**
* Getter for the base URI to be used for parsing relative URIs in responses
* @return
*/
protected String getBaseUri(){
return baseUri;
}
@SuppressWarnings("unchecked")
@Activate
protected void activate(ComponentContext context) {
log.debug("in "+AbstractEntitySearcher.class.getSimpleName()+" activate with context "+context);
// TODO handle updates to the configuration
if(context != null && context.getProperties() != null){
this.context = context;
Dictionary properties = context.getProperties();
Object queryUriObject = properties.get(QUERY_URI);
Object accessUriObject = properties.get(ACCESS_URI); //use as an fallback
if(queryUriObject != null){
this.queryUri = queryUriObject.toString();
//now set the new config
} else if(accessUriObject != null){
log.info("Using AccessUri as fallback for missing QueryUri Proerty (accessUri="+accessUriObject);
this.queryUri = accessUriObject.toString();
} else {
throw new IllegalArgumentException("The property "+EntitySearcher.QUERY_URI+" must be defined");
}
this.baseUri = extractBaseUri(queryUri);
this.config = properties;
} else {
throw new IllegalArgumentException("The property "+EntitySearcher.QUERY_URI+" must be defined");
}
}
/**
* computes the base URL based on service URLs
* @param the URL of the remote service
* @return the base URL used to parse relative URIs in responses.
*/
protected static String extractBaseUri(String uri) {
//extract the namepsace from the query URI to use it fore parsing
//responses with relative URIs
String baseUri;
int index = Math.max(uri.lastIndexOf('#'),uri.lastIndexOf('/'));
int protIndex = uri.indexOf("://")+3; //do not convert http://www.example.org
if(protIndex < 0){
protIndex = 0;
}
//do not convert if the parsed uri does not contain a local name
if(index > protIndex && index+1 < uri.length()){
baseUri = uri.substring(0, index+1);
} else {
if(!(uri.charAt(uri.length()-1) == '/' || uri.charAt(uri.length()-1) == '#')){
baseUri = uri+'/'; //add a tailing '/' to Uris like http://www.example.org
} else {
baseUri = uri;
}
}
return baseUri;
}
@Deactivate
protected void deactivate(ComponentContext context) {
log.debug("in "+AbstractEntitySearcher.class.getSimpleName()+" deactivate with context "+context);
this.config = null;
this.queryUri = null;
this.baseUri = null;
}
/**
* The OSGI configuration as provided by the activate method
* @return
*/
protected final Dictionary getSiteConfiguration() {
return config;
}
protected final ComponentContext getComponentContext(){
return context;
}
}