Package com.norconex.crawler.web.doc.operations.checksum.impl

Class LastModifiedMetadataChecksummer

java.lang.Object

com.norconex.crawler.core.doc.operations.checksum.AbstractMetadataChecksummer<BaseChecksummerConfig>

com.norconex.crawler.web.doc.operations.checksum.impl.LastModifiedMetadataChecksummer

All Implemented Interfaces:

Configurable<BaseChecksummerConfig>, MetadataChecksummer

public class LastModifiedMetadataChecksummer
extends AbstractMetadataChecksummer<BaseChecksummerConfig>

Default implementation of MetadataChecksummer for the Norconex Web Crawler which simply returns the exact value of the "Last-Modified" HTTP header field, or null if not present.

You have the option to keep the checksum as a document metadata field. When BaseChecksummerConfig.setKeep(boolean) is true, the checksum will be stored in the target field name specified. If you do not specify any, it stores it under the metadata field name CrawlerDocMetaConstants.CHECKSUM_METADATA.

To use different fields (one or several) to constitute a checksum, you can instead use the GenericMetadataChecksummer.

Since:

2.2.0

See Also:

• GenericMetadataChecksummer

Field Summary

Fields

Modifier and Type	Field	Description
static final String	LAST_MODIFIED_FIELD	HTTP header name used to perform checksum.

Fields inherited from interface com.norconex.commons.lang.config.Configurable

PROPERTY

Constructor Summary

Constructors

Constructor	Description
LastModifiedMetadataChecksummer()

Method Summary

Modifier and Type	Method	Description
protected boolean	canEqual(Object other)
protected String	doCreateMetaChecksum(Properties metadata)
boolean	equals(Object o)
BaseChecksummerConfig	getConfiguration()
int	hashCode()
String	toString()

Methods inherited from class com.norconex.crawler.core.doc.operations.checksum.AbstractMetadataChecksummer

createMetadataChecksum

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Details

LAST_MODIFIED_FIELD

public static final String LAST_MODIFIED_FIELD

HTTP header name used to perform checksum.

See Also:

• Constant Field Values

Constructor Details

LastModifiedMetadataChecksummer

public LastModifiedMetadataChecksummer()

Method Details

doCreateMetaChecksum

protected String doCreateMetaChecksum(Properties metadata)

Specified by:

doCreateMetaChecksum in class AbstractMetadataChecksummer<BaseChecksummerConfig>

getConfiguration

public BaseChecksummerConfig getConfiguration()

equals

public boolean equals(Object o)

Overrides:

equals in class AbstractMetadataChecksummer<BaseChecksummerConfig>

canEqual

protected boolean canEqual(Object other)

Overrides:

canEqual in class AbstractMetadataChecksummer<BaseChecksummerConfig>

hashCode

public int hashCode()

Overrides:

hashCode in class AbstractMetadataChecksummer<BaseChecksummerConfig>

toString

public String toString()

Overrides:

toString in class AbstractMetadataChecksummer<BaseChecksummerConfig>