sequentialmatchingpatterns.java

来自「resetful样式的ws样例,一种面向资源的webservices服务」· Java 代码 · 共 102 行

/*
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://jersey.dev.java.net/CDDL+GPL.html
 * or jersey/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at jersey/legal/LICENSE.txt.
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 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
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 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
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 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */
package com.sun.jersey.impl.uri.rules;

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

/**
 * Rules associated with instances of {@link UriPattern) and matched 
 * in order. Zero or more matches may occur.
 * 
 * @author [e-mail]
 */
public final class SequentialMatchingPatterns<R> implements UriRules<R> {

    private final List<PatternRulePair<R>> rules;

    public SequentialMatchingPatterns(List<PatternRulePair<R>> rules) {
        this.rules = rules;
    }
    
    public Iterator<R> match(CharSequence path, List<String> capturingGroupValues) {
        return new XInterator(path, capturingGroupValues);
    }

    private final class XInterator implements Iterator<R> {

        private final CharSequence path;
        private final List<String> capturingGroupValues;
        private final Iterator<PatternRulePair<R>> i;
        private R r;

        XInterator(CharSequence path, List<String> capturingGroupValues) {
            this.path = path;
            this.capturingGroupValues = capturingGroupValues;
            this.i = rules.iterator();
        }
        
        public boolean hasNext() {
            if (r != null) return true;
            
            while(i.hasNext()) {
                final PatternRulePair<R> prp = i.next();
                if (prp.p.match(path, capturingGroupValues)) {
                    r = prp.r;
                    return true;
                }                
            }
            r = null;
            return false;
        }

        public R next() {
            if (!hasNext()) throw new NoSuchElementException();

            final R _r = r;
            r = null;
            return _r;
        }

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