CacheTime.php

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<?php
class CacheTime {
    public $mUsedOptions;

    var $mVersion = Parser::VERSION,  # Compatibility check
        $mCacheTime = '',             # Time when this object was generated, or -1 for uncacheable. Used in ParserCache.
        $mCacheExpiry = null,         # Seconds after which the object should expire, use 0 for uncachable. Used in ParserCache.
        $mContainsOldMagic,           # Boolean variable indicating if the input contained variables like {{CURRENTDAY}}
        $mCacheRevisionId = null;     # Revision ID that was parsed

    function getCacheTime() {
        return wfTimestamp( TS_MW, $this->mCacheTime );
    }

    function containsOldMagic() {
        return $this->mContainsOldMagic;
    }

    function setContainsOldMagic( $com ) {
        return wfSetVar( $this->mContainsOldMagic, $com );
    }

    function setCacheTime( $t ) {
        return wfSetVar( $this->mCacheTime, $t );
    }

    function getCacheRevisionId() {
        return $this->mCacheRevisionId;
    }

    function setCacheRevisionId( $id ) {
        $this->mCacheRevisionId = $id;
    }

    function updateCacheExpiry( $seconds ) {
        $seconds = (int)$seconds;

        if ( $this->mCacheExpiry === null || $this->mCacheExpiry > $seconds ) {
            $this->mCacheExpiry = $seconds;
        }

        // hack: set old-style marker for uncacheable entries.
        if ( $this->mCacheExpiry !== null && $this->mCacheExpiry <= 0 ) {
            $this->mCacheTime = -1;
        }
    }

    function getCacheExpiry() {
        global $wgParserCacheExpireTime;

        if ( $this->mCacheTime < 0 ) {
            return 0;
        } // old-style marker for "not cachable"

        $expire = $this->mCacheExpiry;

        if ( $expire === null ) {
            $expire = $wgParserCacheExpireTime;
        } else {
            $expire = min( $expire, $wgParserCacheExpireTime );
        }

        if ( $this->containsOldMagic() ) { //compatibility hack
            $expire = min( $expire, 3600 ); # 1 hour
        }

        if ( $expire <= 0 ) {
            return 0; // not cachable
        } else {
            return $expire;
        }
    }

    function isCacheable() {
        return $this->getCacheExpiry() > 0;
    }

    public function expired( $touched ) {
        global $wgCacheEpoch;
        return !$this->isCacheable() || // parser says it's uncacheable
            $this->getCacheTime() < $touched ||
            $this->getCacheTime() <= $wgCacheEpoch ||
            $this->getCacheTime() < wfTimestamp( TS_MW, time() - $this->getCacheExpiry() ) || // expiry period has passed
            !isset( $this->mVersion ) ||
            version_compare( $this->mVersion, Parser::VERSION, "lt" );
    }

    public function isDifferentRevision( $id ) {
        $cached = $this->getCacheRevisionId();
        return $cached !== null && $id !== $cached;
    }
}