apoc.diff.Diff Maven / Gradle / Ivy

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Core package for Neo4j Procedures
There is a newer version: 5.24.0
package apoc.diff;

import apoc.util.Util;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Transaction;
import org.neo4j.procedure.Context;
import org.neo4j.procedure.Description;
import org.neo4j.procedure.Name;
import org.neo4j.procedure.UserFunction;

import java.util.HashMap;
import java.util.Map;

/**
 * @author Benjamin Clauss
 * @since 15.06.2018
 */
public class Diff {

    @Context
    public Transaction tx;

    @UserFunction("apoc.diff.nodes")
    @Description("Returns a list detailing the differences between the two given nodes.")
    public Map nodes(@Name("leftNode") Node leftNode, @Name("rightNode") Node rightNode) {
        leftNode = Util.rebind(tx, leftNode);
        rightNode = Util.rebind(tx, rightNode);
        Map allLeftProperties = leftNode.getAllProperties();
        Map allRightProperties = rightNode.getAllProperties();

        Map result = new HashMap<>();
        result.put("leftOnly", getPropertiesOnlyLeft(allLeftProperties, allRightProperties));
        result.put("rightOnly", getPropertiesOnlyLeft(allRightProperties, allLeftProperties));
        result.put("inCommon", getPropertiesInCommon(allLeftProperties, allRightProperties));
        result.put("different", getPropertiesDiffering(allLeftProperties, allRightProperties));

        return result;
    }

    private Map getPropertiesOnlyLeft(Map left, Map right) {
        Map leftOnly = new HashMap<>();
        leftOnly.putAll(left);
        leftOnly.keySet().removeAll(right.keySet());
        return leftOnly;
    }

    private Map getPropertiesInCommon(Map left, Map right) {
        Map inCommon = new HashMap<>(left);
        inCommon.entrySet().retainAll(right.entrySet());
        return inCommon;
    }

    private Map> getPropertiesDiffering(Map left, Map right) {
        Map> different = new HashMap<>();
        Map keyPairs = new HashMap<>();
        keyPairs.putAll(left);
        keyPairs.keySet().retainAll(right.keySet());

        for (Map.Entry entry : keyPairs.entrySet()) {
            if (!left.get(entry.getKey()).equals(right.get(entry.getKey()))) {
                Map pairs = new HashMap<>();
                pairs.put("left", left.get(entry.getKey()));
                pairs.put("right", right.get(entry.getKey()));
                different.put(entry.getKey(), pairs);
            }
        }
        return different;
    }
}