Package org.dspace.importer.external.metadatamapping.contributor

Class AbstractJsonPathMetadataProcessor

java.lang.Object

org.dspace.importer.external.metadatamapping.contributor.AbstractJsonPathMetadataProcessor

All Implemented Interfaces:

JsonPathMetadataProcessor

Direct Known Subclasses:

InvertedIndexProcessor, OpenAlexDateMetadataProcessor, RegexReplacingJsonPathMetadataProcessor

public abstract class AbstractJsonPathMetadataProcessor
extends Object
implements JsonPathMetadataProcessor

An abstract implementation of JsonPathMetadataProcessor that processes JSON data using a JSONPath expression. This class provides a base structure for extracting values from a JSON object while allowing subclasses to define specific behaviors. The extraction process:

1. Converts a JSON string into a JsonNode object.
2. Retrieves a sub-node based on the JSONPath expression returned by getPath().
3. Extracts values from the node and processes them using getStringValue(JsonNode).
4. Returns a collection of extracted values.

Subclasses must implement:

• getStringValue(JsonNode) - Defines how values are extracted from a JSON node.
• getLogger() - Provides a logger instance for error handling.
• getPath() - Specifies the JSONPath used to extract data.

Author:

Adamo Fapohunda (adamo.fapohunda at 4science.com)

See Also:

• JsonPathMetadataProcessor
• JsonNode
• ObjectMapper
• Logger

Constructor Summary

Constructors

Constructor	Description
AbstractJsonPathMetadataProcessor()

Method Summary

Modifier and Type	Method	Description
protected abstract org.apache.logging.log4j.Logger	getLogger()	Provides the logger for logging errors and messages.
protected abstract String	getPath()	Returns the JSONPath expression used for extracting values from JSON.
protected abstract String	getStringValue(com.fasterxml.jackson.databind.JsonNode node)	Extracts a string representation of the value from a JsonNode.
Collection<String>	processMetadata(String json)	Extracts metadata from a JSON string using a predefined JSONPath.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

AbstractJsonPathMetadataProcessor

public AbstractJsonPathMetadataProcessor()

Method Details

processMetadata

public Collection<String> processMetadata(String json)

Extracts metadata from a JSON string using a predefined JSONPath. The extracted values are processed and returned as a collection of strings.

Specified by:

processMetadata in interface JsonPathMetadataProcessor

Parameters:

json - The JSON string to process.

Returns:

A collection of extracted string values.

getStringValue

protected abstract String getStringValue(com.fasterxml.jackson.databind.JsonNode node)

Extracts a string representation of the value from a JsonNode. The implementation of this method must be provided by subclasses.

Parameters:

node - The JSON node from which to extract the value.

Returns:

A string representation of the value.

getLogger

protected abstract org.apache.logging.log4j.Logger getLogger()

Provides the logger for logging errors and messages. The implementation of this method must be provided by subclasses.

Returns:

A Logger instance.

getPath

protected abstract String getPath()

Returns the JSONPath expression used for extracting values from JSON. The implementation of this method must be provided by subclasses.

Returns:

A string representing the JSONPath expression.