liquibase.diff.compare.DatabaseObjectComparatorChain Maven / Gradle / Ivy

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package liquibase.diff.compare;

import liquibase.database.Database;
import liquibase.diff.ObjectDifferences;
import liquibase.structure.DatabaseObject;

import java.util.List;
import java.util.Set;

public class DatabaseObjectComparatorChain {
    private CompareControl.SchemaComparison[] schemaComparisons;
    private final List comparators;
    private int nextIndex; //this class is used often enough that the overhead of an iterator adds up to a significant percentage of the execution time

    public DatabaseObjectComparatorChain(List comparators, CompareControl.SchemaComparison[] schemaComparisons) {
        this.comparators = comparators;
        this.schemaComparisons = schemaComparisons;
    }

    protected DatabaseObjectComparatorChain copy() {
        return new DatabaseObjectComparatorChain(comparators, schemaComparisons);
    }

    public CompareControl.SchemaComparison[] getSchemaComparisons() {
        return schemaComparisons;
    }

    public boolean isSameObject(DatabaseObject object1, DatabaseObject object2, Database accordingTo) {
        if ((object1 == null) && (object2 == null)) {
            return true;
        }
        if ((object1 == null) && (object2 != null)) {
            return false;
        }

        if ((object1 != null) && (object2 == null)) {
            return false;
        }

        if (comparators == null) {
            return true;
        }

        DatabaseObjectComparator next = getNextComparator();

        if (next == null) {
            return true;
        }

        return next.isSameObject(object1, object2, accordingTo, this);
    }

    public String[] hash(DatabaseObject object, Database accordingTo) {
        if (object == null) {
            return null;
        }

        DatabaseObjectComparator next = getNextComparator();

        if (next == null) {
            return null;
        }

        return next.hash(object, accordingTo, this);
    }

    private DatabaseObjectComparator getNextComparator() {
        if (comparators == null) {
            return null;
        }

        if (nextIndex >= comparators.size()) {
            return null;
        }

        DatabaseObjectComparator next = comparators.get(nextIndex);
        nextIndex++;
        return next;
    }

    public ObjectDifferences findDifferences(DatabaseObject object1, DatabaseObject object2, Database accordingTo, CompareControl compareControl, Set exclude) {
        if ((object1 == null) && (object2 == null)) {
            return new ObjectDifferences(compareControl);
        }
        if ((object1 == null) && (object2 != null)) {
            return new ObjectDifferences(compareControl).addDifference("Reference value was null", "this", null, null);
        }

        if ((object1 != null) && (object2 == null)) {
            return new ObjectDifferences(compareControl).addDifference("Compared value was null", "this", null, null);
        }

        DatabaseObjectComparator next = getNextComparator();

        if (next == null) {
            return new ObjectDifferences(compareControl);
        }

        return next.findDifferences(object1, object2, accordingTo, compareControl, this, exclude);
    }

    public void setSchemaComparisons(CompareControl.SchemaComparison[] schemaComparisons) {
        this.schemaComparisons = schemaComparisons;
    }
}