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package com.sun.jersey.server.impl.uri.rules;
import com.sun.jersey.api.uri.UriPattern;
import com.sun.jersey.spi.uri.rules.UriMatchResultContext;
import com.sun.jersey.spi.uri.rules.UriRules;
import java.util.Collection;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.regex.MatchResult;
/**
* Rules associated with instances of {@link UriPattern) and matched
* to return at most one match.
* <p>
* The class will iterate through the collection of {@link UriPattern) until
* a match is found. Note that this does not scale.
*
* @author Paul.Sandoz@Sun.Com
*/
public final class AtomicMatchingPatterns<R> implements UriRules<R> {
private final Collection<PatternRulePair<R>> rules;
public AtomicMatchingPatterns(Collection<PatternRulePair<R>> rules) {
this.rules = rules;
}
public Iterator<R> match(CharSequence path, UriMatchResultContext resultContext) {
if (resultContext.isTracingEnabled()) {
StringBuilder sb = new StringBuilder();
sb.append("match path \"").append(path).append("\" -> ");
boolean first = true;
for (PatternRulePair<R> prp : rules) {
if (!first)
sb.append(", ");
sb.append("\"").append(prp.p.toString()).append("\"");
first = false;
}
resultContext.trace(sb.toString());
}
for (PatternRulePair<R> prp : rules) {
// Match each template
final MatchResult mr = prp.p.match(path);
if (mr != null) {
resultContext.setMatchResult(mr);
return new SingleEntryIterator<R>(prp.r);
}
}
return new EmptyIterator<R>();
}
private static final class SingleEntryIterator<T> implements Iterator<T> {
private T t;
SingleEntryIterator(T t) {
this.t = t;
}
public boolean hasNext() {
return t != null;
}
public T next() {
if (hasNext()) {
final T _t = t;
t = null;
return _t;
} else {
throw new NoSuchElementException();
}
}
public void remove() {
throw new UnsupportedOperationException();
}
}
private static final class EmptyIterator<T> implements Iterator<T> {
public boolean hasNext() {
return false;
}
public T next() {
throw new NoSuchElementException();
}
public void remove() {
throw new UnsupportedOperationException();
}
}
}