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[CST-18016] Improved OpenAlex Publication mapping
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...orter/external/metadatamapping/contributor/ConditionEqualJsonPathMetadataContributor.java
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| /** | ||
| * The contents of this file are subject to the license and copyright | ||
| * detailed in the LICENSE and NOTICE files at the root of the source | ||
| * tree and available online at | ||
| * | ||
| * http://www.dspace.org/license/ | ||
| */ | ||
| package org.dspace.importer.external.metadatamapping.contributor; | ||
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| import java.util.Collection; | ||
| import java.util.Collections; | ||
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| import org.apache.logging.log4j.LogManager; | ||
| import org.apache.logging.log4j.Logger; | ||
| import org.dspace.importer.external.metadatamapping.MetadatumDTO; | ||
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| /** | ||
| * A metadata contributor that extracts a value from JSON using a {@link JsonPathMetadataProcessor} | ||
| * and compares it against a predefined right operand. If the extracted value matches the right operand, | ||
| * the specified {@link SimpleJsonPathMetadataContributor} is used to extract additional metadata. | ||
| * Otherwise, an empty collection is returned. | ||
| * | ||
| * This class extends {@link SimpleJsonPathMetadataContributor} and allows conditional metadata extraction | ||
| * based on JSON path processing. | ||
| * | ||
| * @author Adamo Fapohunda (adamo.fapohunda at 4science.com) | ||
| */ | ||
| public class ConditionEqualJsonPathMetadataContributor extends SimpleJsonPathMetadataContributor { | ||
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| private static final Logger log = LogManager.getLogger(ConditionEqualJsonPathMetadataContributor.class); | ||
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| private JsonPathMetadataProcessor leftOperandProcessor; | ||
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| private String rightOperand; | ||
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| private SimpleJsonPathMetadataContributor metadatumContributor; | ||
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| /** | ||
| * Extracts metadata from the provided JSON string. The extraction process follows these steps: | ||
| * <ol> | ||
| * <li>Uses {@link JsonPathMetadataProcessor} to extract a value from the JSON.</li> | ||
| * <li>Compares the extracted value with the predefined right operand.</li> | ||
| * <li>If they match, the {@link SimpleJsonPathMetadataContributor} is used to extract and return metadata.</li> | ||
| * <li>If they do not match, an empty collection is returned.</li> | ||
| * </ol> | ||
| * | ||
| * @param json The JSON string to process. | ||
| * @return A collection of {@link MetadatumDTO} if the condition is met; otherwise, an empty collection. | ||
| */ | ||
| @Override | ||
| public Collection<MetadatumDTO> contributeMetadata(String json) { | ||
| Collection<String> leftOperands = leftOperandProcessor.processMetadata(json); | ||
| if (leftOperands == null || leftOperands.size() != 1) { | ||
| log.warn("No left operands found in json path: " + json); | ||
| return Collections.emptyList(); | ||
| } | ||
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| if (rightOperand.equals(leftOperands.iterator().next())) { | ||
| return metadatumContributor.contributeMetadata(json); | ||
| } | ||
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| return Collections.emptyList(); | ||
| } | ||
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| /** | ||
| * Sets the {@link JsonPathMetadataProcessor} responsible for extracting the left operand value from the JSON. | ||
| * | ||
| * @param leftOperandProcessor The JSON path processor used for extraction. | ||
| */ | ||
| public void setLeftOperandProcessor( | ||
| JsonPathMetadataProcessor leftOperandProcessor) { | ||
| this.leftOperandProcessor = leftOperandProcessor; | ||
| } | ||
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| /** | ||
| * Sets the right operand value that the extracted JSON value must match for metadata extraction to proceed. | ||
| * | ||
| * @param rightOperand The expected value to compare against. | ||
| */ | ||
| public void setRightOperand(String rightOperand) { | ||
| this.rightOperand = rightOperand; | ||
| } | ||
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| /** | ||
| * Sets the {@link SimpleJsonPathMetadataContributor} responsible for extracting metadata if the condition is met. | ||
| * | ||
| * @param metadatumContributor The metadata contributor to use upon a successful match. | ||
| */ | ||
| public void setMetadatumContributor( | ||
| SimpleJsonPathMetadataContributor metadatumContributor) { | ||
| this.metadatumContributor = metadatumContributor; | ||
| } | ||
| } |
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