80 lines
1.9 KiB
Java
80 lines
1.9 KiB
Java
package org.gcube.datacatalogue.ckanutillibrary;
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import java.util.concurrent.ConcurrentHashMap;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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/**
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* Use this factory to retrieve an utility class instance associated to a particular scope.
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* NOTE: YOU ARE SUGGESTED TO USE THIS CLASS, DO NOT INSTANCIATE THE CkanUtils OBJECT DIRECTLY.
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* @author Costantino Perciante at ISTI-CNR (costantino.perciante@isti.cnr.it)
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*/
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public class CKanUtilsFactory {
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/**
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* logger
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*/
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private static final Logger logger = LoggerFactory.getLogger(CKanUtilsFactory.class);
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/**
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* map <scope, util class for this scope>
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*/
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private static ConcurrentHashMap<String, CKanUtilsImpl> instanceForScopes;
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/**
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* this object singleton instance
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*/
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private static CKanUtilsFactory factoryInstance = new CKanUtilsFactory();
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/**
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* private constructor
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*/
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private CKanUtilsFactory(){
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logger.debug("Instanciating factory");
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instanceForScopes = new ConcurrentHashMap<String, CKanUtilsImpl>();
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}
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/**
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* Get the factory object
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*/
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public static CKanUtilsFactory getInstance(){
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return factoryInstance;
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}
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/**
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* Retrieve catalogue utils class for this scope
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* @param scope
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* @throws Exception
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*/
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public CKanUtilsImpl getCkanUtilsForScope(String scope) throws Exception{
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logger.debug("Requested catalogue utils for scope " + scope);
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if(scope == null || scope.isEmpty()){
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logger.error("Malformed scope, ignoring request");
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return null;
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}
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if(instanceForScopes.containsKey(scope)){
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logger.debug("Catalogue utils already cached for scope = " + scope + ", returning object");
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return instanceForScopes.get(scope);
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}
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else{
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logger.debug("Instanciating utils for this scope");
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CKanUtilsImpl utilsForScope = new CKanUtilsImpl(scope);
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// save into the map
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instanceForScopes.put(scope, utilsForScope);
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return utilsForScope;
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}
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}
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}
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