CombiningMatchingPatterns.java

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package com.sun.jersey.server.impl.uri.rules;

import com.sun.jersey.spi.uri.rules.UriMatchResultContext;
import com.sun.jersey.spi.uri.rules.UriRules;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;

/**
 * Rules combining one or more other rules and matching in sequence.
 * 
 * @author Paul.Sandoz@Sun.Com
 */
public class CombiningMatchingPatterns<R> implements UriRules<R> {

    private final List<UriRules<R>> rs;
        
    public CombiningMatchingPatterns(List<UriRules<R>> rs) {
        this.rs = rs;
    }

    public Iterator<R> match(CharSequence path, UriMatchResultContext resultContext) {
        return new XInterator(path, resultContext);
    }

    private final class XInterator implements Iterator<R> {

        private final CharSequence path;
        private final UriMatchResultContext resultContext;
        private Iterator<R> ruleIterator;
        private Iterator<UriRules<R>> rulesIterator;
        private R r;

        XInterator(CharSequence path, UriMatchResultContext resultContext) {
            this.path = path;
            this.resultContext = resultContext;
            this.rulesIterator = rs.iterator();
            this.ruleIterator = rulesIterator.next().match(path, resultContext);
        }
        
        public boolean hasNext() {
            if (r != null) return true;

            if (ruleIterator.hasNext()) {
                r = ruleIterator.next();
                return true;
            }
            
            while (rulesIterator.hasNext()) {
                ruleIterator = rulesIterator.next().match(path, resultContext);                
                if (ruleIterator.hasNext()) {
                    r = ruleIterator.next();
                    return true;                
                }
            }
            
            return false;
        }

        public R next() {
            if (!hasNext()) throw new NoSuchElementException();
            
            final R _r = r;
            r = null;
            return _r;
        }

        public void remove() {
            throw new UnsupportedOperationException();
        }
    }
}