cayenne-server/src/main/java/org/apache/cayenne/access/flush/EffectiveOpId.java

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package org.apache.cayenne.access.flush;

import java.util.HashMap;
import java.util.Map;
import java.util.function.Supplier;

import org.apache.cayenne.ObjectId;

/**
 * Helper value-object class that used to compare operations by "effective" id (i.e. by id snapshot,
 * that will include replacement id if any).
 * This class is not used directly by Cayenne, it's designed to ease custom implementations.
 * @since 4.2
 */
@SuppressWarnings("unused")
public class EffectiveOpId {
    private final String entityName;
    private final Map<String, Object> snapshot;
    private final ObjectId id;

    public EffectiveOpId(ObjectId id) {
        this.id = id;
        this.entityName = id.getEntityName();
        this.snapshot = new HashMap<>(id.getIdSnapshot());
        this.snapshot.entrySet().forEach(entry -> {
            if(entry.getValue() instanceof Supplier) {
                entry.setValue(((Supplier) entry.getValue()).get());
            }
        });
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        EffectiveOpId that = (EffectiveOpId) o;

        if(id == that.id) return true;

        if(snapshot.isEmpty()) {
            return false;
        }

        if (!entityName.equals(that.entityName)) return false;
        return snapshot.equals(that.snapshot);

    }

    @Override
    public int hashCode() {
        int result = entityName.hashCode();
        result = 31 * result + snapshot.hashCode();
        return result;
    }
}