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141 lines
3.4 KiB
Java
141 lines
3.4 KiB
Java
package org.gcube.common.clients.fw.queries;
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import static java.lang.String.*;
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import java.net.URI;
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import java.util.ArrayList;
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import java.util.List;
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import javax.xml.ws.EndpointReference;
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import org.gcube.common.clients.exceptions.DiscoveryException;
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import org.gcube.common.clients.fw.plugin.Plugin;
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import org.gcube.common.clients.queries.Query;
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import org.gcube.common.resources.gcore.ServiceInstance;
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import org.gcube.resources.discovery.client.api.DiscoveryClient;
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import org.gcube.resources.discovery.client.queries.api.SimpleQuery;
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import org.gcube.resources.discovery.icclient.ICFactory;
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/**
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* A {@link Query} for stateful gCore services.
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*
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* @author Fabio Simeoni
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*
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*/
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public class StatefulQuery implements Query<EndpointReference> {
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private static String classFormat = "$resource/Data/gcube:ServiceClass/text() eq '%1s'";
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private static String nameFormat = "$resource/Data/gcube:ServiceName/text() eq '%1s'";
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private static String entryFormat = "$resource/Source/text()[ends-with(.,'%1s')]";
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private static DiscoveryClient<ServiceInstance> client = ICFactory.clientFor(ServiceInstance.class);
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private final SimpleQuery query;
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/**
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* Creates an instance with a given proxy {@link Plugin}.
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*
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* @param plugin the plugin
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*/
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public StatefulQuery(Plugin<?,?> plugin) {
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query = ICFactory.queryFor(ServiceInstance.class)
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.addCondition(format(classFormat,plugin.serviceClass()))
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.addCondition(format(nameFormat,plugin.serviceName()))
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.addCondition(format(entryFormat,plugin.name()));
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}
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/**
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* Adds a variable to the query.
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*
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* @param name the name of the variable
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* @param range the range of the variable
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* @return the query
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*
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* @see SimpleQuery#addVariable(String, String)
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*
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*/
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public StatefulQuery addVariable(String name, String range) {
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query.addVariable(name, range);
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return this;
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}
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/**
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* Adds a free-form condition on query results.
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*
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* @param condition the condition
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* @return the query
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* @see SimpleQuery#addCondition(String)
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*/
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public StatefulQuery addCondition(String condition) {
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query.addCondition(condition);
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return this;
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}
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/**
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* Adds a namespace to the query.
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* @param prefix the namespace prefix
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* @param uri the namespace URI
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* @return the query
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* @see SimpleQuery#addNamespace(String, URI)
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*/
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public StatefulQuery addNamespace(String prefix, URI uri) {
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query.addNamespace(prefix, uri);
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return this;
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}
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@Override
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public List<EndpointReference> fire() throws DiscoveryException {
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List<EndpointReference> refs = new ArrayList<EndpointReference>();
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List<ServiceInstance> instances = null;
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try {
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instances = client.submit(query);
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}
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catch(org.gcube.resources.discovery.client.api.DiscoveryException ex) {
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throw new DiscoveryException(ex);
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}
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for(ServiceInstance instance : instances)
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refs.add(instance.reference());
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return refs;
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}
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@Override
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public String toString() {
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return query.toString();
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}
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@Override
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public int hashCode() {
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final int prime = 31;
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int result = 1;
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result = prime * result + ((query == null) ? 0 : query.hashCode());
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return result;
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}
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@Override
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public boolean equals(Object obj) {
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if (this == obj)
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return true;
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if (obj == null)
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return false;
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if (getClass() != obj.getClass())
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return false;
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StatefulQuery other = (StatefulQuery) obj;
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if (query == null) {
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if (other.query != null)
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return false;
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} else if (!query.equals(other.query))
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return false;
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return true;
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}
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}
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