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package net.java.ao.schema.ddl;


import java.util.Objects;

/**
 * An SQL statement representing some stage of schema modification.
 * This may optionally have a corresponding "undo" action which can be executed to roll
 * back this modification; this will only be done if the modification succeeded but then
 * some later action failed.
 */
public final class SQLAction {
    private final String statement;
    private final SQLAction undoAction;

    private SQLAction(String statement, SQLAction undoAction) {
        this.statement = Objects.requireNonNull(statement, "statement can't be null");
        this.undoAction = undoAction;
    }

    public static SQLAction of(CharSequence statement) {
        return new SQLAction(statement.toString(), null);
    }

    public SQLAction withUndoAction(SQLAction undoAction) {
        return new SQLAction(this.statement, undoAction);
    }

    public String getStatement() {
        return statement;
    }

    public SQLAction getUndoAction() {
        return undoAction;
    }

    @Override
    public String toString() {
        return "SQLAction{" +
                "statement='" + statement + '\'' +
                ", undoAction=" + undoAction +
                '}';
    }
}