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Java example source code file (BestMatchSpec.java)

This example source code file (BestMatchSpec.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java tags/keywords

bestmatchspec, browsercompatspec, cookie, cookieorigin, header, headerelement, illegalargumentexception, list, malformedcookieexception, netscapedraftspec, notthreadsafe, rfc2109spec, setcookie2, string, util

The BestMatchSpec.java example source code

/*
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */ 

package org.apache.http.impl.cookie;

import java.util.List;

import org.apache.http.annotation.NotThreadSafe;

import org.apache.http.Header;
import org.apache.http.HeaderElement;
import org.apache.http.cookie.Cookie;
import org.apache.http.cookie.CookieOrigin;
import org.apache.http.cookie.CookieSpec;
import org.apache.http.cookie.MalformedCookieException;
import org.apache.http.cookie.SM;
import org.apache.http.cookie.SetCookie2;

/**
 * 'Meta' cookie specification that picks up a cookie policy based on 
 * the format of cookies sent with the HTTP response.
 *
 * @since 4.0
 */
@NotThreadSafe // CookieSpec fields are @NotThreadSafe
public class BestMatchSpec implements CookieSpec {

    private final String[] datepatterns;
    private final boolean oneHeader;
    
    // Cached values of CookieSpec instances
    private RFC2965Spec strict; // @NotThreadSafe
    private RFC2109Spec obsoleteStrict; // @NotThreadSafe
    private BrowserCompatSpec compat; // @NotThreadSafe
    private NetscapeDraftSpec netscape; // @NotThreadSafe

    public BestMatchSpec(final String[] datepatterns, boolean oneHeader) {
        super();
        this.datepatterns = datepatterns == null ? null : datepatterns.clone();
        this.oneHeader = oneHeader;
    }

    public BestMatchSpec() {
        this(null, false);
    }

    private RFC2965Spec getStrict() {
        if (this.strict == null) {
             this.strict = new RFC2965Spec(this.datepatterns, this.oneHeader);
        }
        return strict;
    }

    private RFC2109Spec getObsoleteStrict() {
        if (this.obsoleteStrict == null) {
             this.obsoleteStrict = new RFC2109Spec(this.datepatterns, this.oneHeader);
        }
        return obsoleteStrict;
    }

    private BrowserCompatSpec getCompat() {
        if (this.compat == null) {
            this.compat = new BrowserCompatSpec(this.datepatterns);
        }
        return compat;
    }

    private NetscapeDraftSpec getNetscape() {
        if (this.netscape == null) {
            this.netscape = new NetscapeDraftSpec(this.datepatterns);
        }
        return netscape;
    }

    public List<Cookie> parse(
            final Header header, 
            final CookieOrigin origin) throws MalformedCookieException {
        if (header == null) {
            throw new IllegalArgumentException("Header may not be null");
        }
        if (origin == null) {
           throw new IllegalArgumentException("Cookie origin may not be null");
        }
        HeaderElement[] helems = header.getElements();
        boolean versioned = false;
        boolean netscape = false;
        for (HeaderElement helem: helems) {
            if (helem.getParameterByName("version") != null) {
                versioned = true;
            }
            if (helem.getParameterByName("expires") != null) {
               netscape = true;
            }
        }
        // Do we have a cookie with a version attribute?
        if (versioned) {
            if (SM.SET_COOKIE2.equals(header.getName())) {
                return getStrict().parse(helems, origin);
            } else {
                return getObsoleteStrict().parse(helems, origin);
            }
        } else if (netscape) {
            // Need to parse the header again,
            // because Netscape draft cannot handle
            // comma separators
            return getNetscape().parse(header, origin);
        } else {
            return getCompat().parse(helems, origin);
        }
    }

    public void validate(
            final Cookie cookie, 
            final CookieOrigin origin) throws MalformedCookieException {
        if (cookie == null) {
            throw new IllegalArgumentException("Cookie may not be null");
        }
        if (origin == null) {
            throw new IllegalArgumentException("Cookie origin may not be null");
        }
        if (cookie.getVersion() > 0) {
            if (cookie instanceof SetCookie2) {
                getStrict().validate(cookie, origin);
            } else {
                getObsoleteStrict().validate(cookie, origin);
            }
        } else {
            getCompat().validate(cookie, origin);
        }
    }

    public boolean match(final Cookie cookie, final CookieOrigin origin) {
        if (cookie == null) {
            throw new IllegalArgumentException("Cookie may not be null");
        }
        if (origin == null) {
            throw new IllegalArgumentException("Cookie origin may not be null");
        }
        if (cookie.getVersion() > 0) {
            if (cookie instanceof SetCookie2) {
                return getStrict().match(cookie, origin);
            } else {
                return getObsoleteStrict().match(cookie, origin);
            }
        } else {
            return getCompat().match(cookie, origin);
        }
    }

    public List<Header> formatCookies(final List cookies) {
        if (cookies == null) {
            throw new IllegalArgumentException("List of cookie may not be null");
        }
        int version = Integer.MAX_VALUE;
        boolean isSetCookie2 = true; 
        for (Cookie cookie: cookies) {
            if (!(cookie instanceof SetCookie2)) {
                isSetCookie2 = false;
            }
            if (cookie.getVersion() < version) {
                version = cookie.getVersion();
            }
        }
        if (version > 0) {
            if (isSetCookie2) {
                return getStrict().formatCookies(cookies);
            } else {
                return getObsoleteStrict().formatCookies(cookies);
            }
        } else {
            return getCompat().formatCookies(cookies);
        }
    }

    public int getVersion() {
        return getStrict().getVersion();
    }

    public Header getVersionHeader() {
        return getStrict().getVersionHeader();
    }

    @Override
    public String toString() {
        return "best-match";
    }
    
}

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