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package edu.ucsb.nceas.metacat.plugin;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Map;
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import java.util.Map.Entry;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import edu.ucsb.nceas.metacat.properties.PropertyService;
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import edu.ucsb.nceas.metacat.shared.ServiceException;
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import edu.ucsb.nceas.utilities.PropertyNotFoundException;
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public class MetacatHandlerPluginManager {
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private static MetacatHandlerPluginManager instance = null;
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private static Log log = LogFactory.getLog(MetacatHandlerPluginManager.class);
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private List<MetacatHandlerPlugin> handlers= new ArrayList<MetacatHandlerPlugin>();
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private MetacatHandlerPluginManager() {
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String[] configuredHandlers = null;
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try {
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String handlersString = PropertyService.getProperty("plugin.handlers");
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if (handlersString != null && handlersString.length() > 0) {
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configuredHandlers = handlersString.split(",");
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for (String className: configuredHandlers) {
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MetacatHandlerPlugin handlerInstance = null;
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try {
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Class<?> handlerClass = Class.forName(className);
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handlerInstance = (MetacatHandlerPlugin) handlerClass.newInstance();
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} catch (Exception e) {
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log.error("Problem initializing MetacatHandlerPlugin: " + className, e);
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continue;
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}
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handlers.add(handlerInstance);
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}
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}
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} catch (PropertyNotFoundException e) {
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log.warn("Could not find any MetacatPluginHandlers", e);
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return;
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}
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}
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public static MetacatHandlerPluginManager getInstance() throws ServiceException {
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if (instance == null) {
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try {
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instance = new MetacatHandlerPluginManager();
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} catch (Exception e) {
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throw new ServiceException(e.getMessage());
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}
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}
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return instance;
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}
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public void addHandler(MetacatHandlerPlugin plugin) {
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}
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public MetacatHandlerPlugin getHandler(String action) {
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for (MetacatHandlerPlugin plugin: handlers) {
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if (plugin.handlesAction(action)) {
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return plugin;
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}
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}
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return null;
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}
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}
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