credentialscache.java.svn-base

开源项目openfire的完整源程序

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package net.java.sipmack.sip.security;

import java.util.Hashtable;

/**
 * The class is used to cache all realms that a certain call has been authorized
 * against and all credentials that have been used for each realm. Note that
 * rfc3261 suggests keeping callId->credentials mapping where as we map
 * realm->credentials. This is done to avoid asking the user for a password
 * before each call.
 *
 * @author Emil Ivov <[e-mail]>
 * @version 1.0
 */

class CredentialsCache {
    // Contains call->realms mappings
    private Hashtable authenticatedRealms = new Hashtable();

    /**
     * Cache credentials for the specified call and realm
     *
     * @param realm      the realm that the specify credentials apply to
     * @param cacheEntry the credentials
     */
    void cacheEntry(String realm, CredentialsCacheEntry cacheEntry) {
        authenticatedRealms.put(realm, cacheEntry);
    }

    /**
     * Returns the credentials corresponding to the specified realm or null if
     * none could be found.
     *
     * @param realm the realm that the credentials apply to
     * @return the credentials corresponding to the specified realm or null if
     *         none could be found.
     */
    CredentialsCacheEntry get(String realm) {
        return (CredentialsCacheEntry)this.authenticatedRealms.get(realm);
    }

    /**
     * Returns the credentials corresponding to the specified realm or null if
     * none could be found and removes the entry from the cache.
     *
     * @param realm
     *            the realm that the credentials apply to
     * @return the credentials corresponding to the specified realm or null if
     *         none could be found.
     */
    CredentialsCacheEntry remove(String realm) {
        return (CredentialsCacheEntry)this.authenticatedRealms.remove(realm);
	}

}