pathpattern.java

来自「resetful样式的ws样例,一种面向资源的webservices服务」· Java 代码 · 共 106 行

/*
 *
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 * 
 * 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
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 * a copy of the License at https://jersey.dev.java.net/CDDL+GPL.html
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 */

package com.sun.jersey.impl.uri;

import com.sun.jersey.api.uri.UriPattern;
import com.sun.jersey.api.uri.UriTemplate;
import java.util.Comparator;

/**
 * A URI pattern that is a regular expression generated from a URI path.
 * 
 * @author [e-mail]
 */
public final class PathPattern extends UriPattern {
    public static final PathPattern EMPTY_PATH = new PathPattern();
    
    /**
     * Order the templates according to the string comparison of the
     * template regular expressions.
     */
    static public final Comparator<PathPattern> COMPARATOR = new Comparator<PathPattern>() {
        public int compare(PathPattern o1, PathPattern o2) {
            // TODO define order of limited=true and limited=false
            return UriTemplate.COMPARATOR.compare(o1.template, o2.template);
        }
    };

    /**
     * The regular expression that represents the right hand side of
     * a URI path.
     */
    private static final String LIMITED = "(/.*)?";
        
    /**
     * The regular expression that represents the right hand side of
     * a URI path that is a '/' or null.
     */
    private static final String UNLIMITED = "(/)?";

    private final UriTemplate template;
    
    private PathPattern() {
        super("");
        this.template = UriTemplate.EMPTY;
    }
    
    /**
     * Create a path pattern from a regular expression.
     * 
     * @param regex the regular expression for the path.
     * @param limited if true than the capturing group '(/.*)?' is appended to
     *        the regex (see above), otherwise '(/)?' is appended.
     */
    public PathPattern(UriTemplate template, boolean limited) {
        super(postfixWithCapturingGroup(template.getPattern().getRegex(), 
                limited));
        
        this.template = template;
    }
    
    public UriTemplate getTemplate() {
        return template;
    }
    
    private static String postfixWithCapturingGroup(String regex, boolean limited) {
        if (regex.endsWith("/"))
            regex = regex.substring(0, regex.length() - 1);
            
        return regex + ((limited) ? LIMITED : UNLIMITED);
    }
}