forked from gCubeSystem/registry-publisher
53 lines
1.6 KiB
Java
53 lines
1.6 KiB
Java
package org.gcube.informationsystem.publisher.scope;
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import java.net.URL;
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import java.net.URLClassLoader;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.List;
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import java.util.ServiceLoader;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public class ScopeValidatorScanner {
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private static Logger log = LoggerFactory.getLogger(ScopeValidatorScanner.class);
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private static ClassLoader loader;
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public static IValidatorContext provider() {
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loader = Thread.currentThread().getContextClassLoader();
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// addJarsToClasspath("customValidator.jar","scope-validator.jar");
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try {
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IValidatorContext impl = null;
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ServiceLoader<IValidatorContext> loader = ServiceLoader.load(IValidatorContext.class);
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Iterator<IValidatorContext> iterator = loader.iterator();
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List<IValidatorContext> impls = new ArrayList<IValidatorContext>();
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while(iterator.hasNext())
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impls.add(iterator.next());
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if (impls.size()==0) {
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impl = new DefaultValidatorContext();
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}
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else if (impls.size()>1)
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throw new Exception("mis-configured environment: detected multiple default validator "+impls);
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else
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impl=impls.get(0);
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log.info("using scope validator "+impl);
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return impl;
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} catch (Exception e) {
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throw new RuntimeException("could not configure scope validator", e);
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}
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}
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private static void addJarsToClasspath(String ... jars) {
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List<URL> jarUrls = new ArrayList<URL>();
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for (String jar : jars)
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jarUrls.add(loader.getResource(jar));
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URLClassLoader urlClassLoader
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= new URLClassLoader(jarUrls.toArray(new URL[0]),loader);
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Thread.currentThread().setContextClassLoader(urlClassLoader);
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}
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}
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