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package eu.dnetlib.enabling.is.sn;
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import java.util.Collection;
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import org.apache.oro.text.perl.Perl5Util;
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/**
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* Provides common functionality for subscription registries.
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*
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* @author marko
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*
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*/
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public abstract class AbstractSubscriptionRegistry {
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/**
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* prefix position in regular expression.
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*/
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private static final int PREFIX_POSITION = 1;
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/**
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* rest of string position in regular expression.
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*/
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private static final int REST_POSITION = 3;
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/**
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* Return true if the subscription prefix is acceptable.
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*
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* Topic expressions are made of slash-delimited components. The "prefix" here is the first slash (/) delimited
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* string of the topic expression.
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*
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* TODO: stupid implementation.
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*
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* @param subscription
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* subscription request
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* @return true if accepted
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*/
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protected TopicExpressionMatchResult matchPrefix(final SubscriptionRequest subscription) {
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final Perl5Util matcher = new Perl5Util(); // NOPMD
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for (String prefix : getAcceptedPrefixes())
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if (matcher.match("/^(" + prefix + ")($|/)(.*)$/", subscription.getTopicExpression())) {
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return new TopicExpressionMatchResult(matcher.getMatch().group(PREFIX_POSITION), matcher.getMatch().group(REST_POSITION));
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}
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return null;
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}
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/**
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* A collection of accepted prefixes.
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*
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* @return prefix list
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*/
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protected abstract Collection<String> getAcceptedPrefixes();
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}
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