filehandler.java

来自「反向的AJAX。最大的特性是我们成为反向的Ajax。DWR1.x允许你用java」· Java 代码 · 共 535 行 · 第 1/2 页

        // Deal with missing If-Modified-Since
        if (modifiedSince == -1)
        {
            if (!etag.equals(givenEtag))
            {
                // There is an ETag, but no If-Modified-Since
                if (log.isDebugEnabled())
                {
                    log.debug("Sending 304 for " + filePath + " Old ETag=" + givenEtag + ", New ETag=" + etag);
                }
                return true;
            }

            // There are no modified setttings, carry on
            return false;
        }

        // Do both values indicate that we are in-date?
        if (etag.equals(givenEtag) && modifiedSince >= servletContainerStartTime)
        {
            if (log.isDebugEnabled())
            {
                log.debug("Sending 304 for " + filePath);
            }
            return true;
        }

        return false;
    }

    /**
     * @param allowGetForSafariButMakeForgeryEasier Do we reduce security to help Safari
     */
    public void setAllowGetForSafariButMakeForgeryEasier(boolean allowGetForSafariButMakeForgeryEasier)
    {
        this.allowGetForSafariButMakeForgeryEasier = allowGetForSafariButMakeForgeryEasier;
    }

    /**
     * @param ignoreLastModified The ignoreLastModified to set.
     */
    public void setIgnoreLastModified(boolean ignoreLastModified)
    {
        this.ignoreLastModified = ignoreLastModified;
    }

    /**
     * Alter the session cookie name from the default JSESSIONID.
     * @param sessionCookieName the sessionCookieName to set
     */
    public void setSessionCookieName(String sessionCookieName)
    {
        this.sessionCookieName = sessionCookieName;
    }

    /**
     * To what level do we compress scripts?
     * @param scriptCompressed The scriptCompressed to set.
     */
    public void setScriptCompressed(boolean scriptCompressed)
    {
        this.scriptCompressed = scriptCompressed;
    }

    /**
     * @param compressionLevel The compressionLevel to set.
     */
    public void setCompressionLevel(int compressionLevel)
    {
        this.compressionLevel = compressionLevel;
    }

    /**
     * @param filePath the filePath to set
     */
    public void setFilePath(String filePath)
    {
        this.filePath = filePath;
    }

    /**
     * Are we expected to do the minor EL type processing?
     * @param dynamic the dynamic to set
     */
    public void setDynamic(boolean dynamic)
    {
        this.dynamic = dynamic;
    }

    /**
     * The mime type to send the output under
     * @param mimeType the mimeType to set
     */
    public void setMimeType(String mimeType)
    {
        this.mimeType = mimeType;
    }

    /**
     * What is the string we use for script tag hack protection
     * @param scriptTagProtection the scriptTagProtection to set
     */
    public void setScriptTagProtection(String scriptTagProtection)
    {
        this.scriptTagProtection = scriptTagProtection;
    }

    /**
     * If we need to override the default path
     * @param overridePath The new override path
     */
    public void setOverridePath(String overridePath)
    {
        this.overridePath = overridePath;
    }

    /**
     * Sometimes with proxies, you need to close the stream all the time to
     * make the flush work. A value of -1 indicated that we do not do early
     * closing after writes.
     * @param maxWaitAfterWrite the maxWaitAfterWrite to set
     */
    public void setMaxWaitAfterWrite(int maxWaitAfterWrite)
    {
        this.maxWaitAfterWrite = maxWaitAfterWrite;
    }

    /**
     * If we need to override the default path
     */
    private String overridePath = null;

    /**
     * By default we disable GET, but this hinders old Safaris
     */
    private boolean allowGetForSafariButMakeForgeryEasier = false;

    /**
     * What is the string we use for script tag hack protection
     */
    private String scriptTagProtection = DwrConstants.SCRIPT_TAG_PROTECTION;

    /**
     * Do we ignore all the Last-Modified/ETags blathering?
     */
    protected boolean ignoreLastModified = false;

    /**
     * Sometimes with proxies, you need to close the stream all the time to
     * make the flush work. A value of -1 indicated that we do not do early
     * closing after writes.
     * See also: org.directwebremoting.dwrp.PollHandler.maxWaitAfterWrite
     */
    protected int maxWaitAfterWrite = -1;

    /**
     * The session cookie name
     */
    protected String sessionCookieName = "JSESSIONID";

    /**
     * How much do we compression javascript by?
     */
    protected int compressionLevel = JavascriptUtil.LEVEL_DEBUGGABLE;

    /**
     * Do we retain comments and unneeded spaces in Javascript code?
     */
    protected boolean scriptCompressed = false;

    /**
     * The method by which we get new page ids
     */
    protected IdGenerator generator = new IdGenerator();

    /**
     * The page id length
     */
    protected int pageIdLength = 16;

    /**
     * We cache the script output for speed
     */
    protected final Map scriptCache = new HashMap();

    /**
     * The file filePath and resource filePath (minus org.directwebremoting) to read from
     */
    private String filePath;

    /**
     * The mime type to send the output under
     */
    private String mimeType;

    /**
     * Are we expected to do the minor EL type processing?
     */
    private boolean dynamic;

    /**
     * What are we sending as the pollWithXhr setting.
     * This is a hack. See the notes in {@link #afterContainerSetup(Container)}
     */
    private String pollWithXhr;

    /**
     * The time on the script files
     */
    private static final long servletContainerStartTime;

    /**
     * The etag (=time for us) on the script files
     */
    private static final String etag;

    /**
     * Initialize the container start time
     */
    static
    {
        // Browsers are only accurate to the second
        long now = System.currentTimeMillis();
        servletContainerStartTime = now - (now % 1000);

        etag = "\"" + servletContainerStartTime + '\"';
    }

    /**
     * Does engine.js do GETs for Safari
     */
    protected static final String PARAM_SCRIPT_ALLOWGET = "${allowGetForSafariButMakeForgeryEasier}";

    /**
     * Doe we force polling with XHR on IE to prevent clicking
     */
    protected static final String PARAM_SCRIPT_POLLXHR = "${pollWithXhr}";

    /**
     * The page id parameter that goes in engine.js
     */
    protected static final String PARAM_SCRIPT_SESSIONID = "${scriptSessionId}";

    /**
     * Under what cookie name is the session id stored?
     */
    protected static final String PARAM_SCRIPT_COOKIENAME = "${sessionCookieName}";

    /**
     * What is the replacement field we use to tell engine.js what we are using
     * for script tag hack protection
     */
    protected static final String PARAM_SCRIPT_TAG_PROTECTION = "${scriptTagProtection}";

    /**
     * What is the replacement field we use to tell engine.js what we are using
     * for script tag hack protection
     */
    protected static final String PARAM_DEFAULT_PATH = "${defaultPath}";

    /**
     * The log stream
     */
    private static final Logger log = Logger.getLogger(FileHandler.class);
}