ru.curs.celesta.score.FieldRef Maven / Gradle / Ivy

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package ru.curs.celesta.score;


/**
 * Reference to a table column.
 */
public final class FieldRef extends Expr {
    private String tableNameOrAlias;
    private String columnName;
    private Column column = null;
    private ViewColumnMeta meta;

    public FieldRef(String tableNameOrAlias, String columnName) {
        if (columnName == null) {
            throw new IllegalArgumentException();
        }
        this.tableNameOrAlias = tableNameOrAlias;
        this.columnName = columnName;

    }

    /**
     * Returns table name or alias.
     *
     */
    public String getTableNameOrAlias() {
        return tableNameOrAlias;
    }

    /**
     * Returns column name.
     *
     */
    public String getColumnName() {
        return columnName;
    }

    @Override
    public ViewColumnMeta getMeta() {
        if (meta == null) {
            if (column != null) {
                updateMeta();
            } else {
                return new ViewColumnMeta<>(ViewColumnType.UNDEFINED);
            }
        }
        return meta;
    }

    private void updateMeta() {
        if (column instanceof IntegerColumn) {
            meta = new ViewColumnMeta<>(ViewColumnType.INT);
        } else if (column instanceof FloatingColumn) {
            meta = new ViewColumnMeta<>(ViewColumnType.REAL);
        } else if (column instanceof DecimalColumn) {
            meta = new ViewColumnMeta<>(ViewColumnType.DECIMAL);
        } else if (column instanceof StringColumn) {
            StringColumn sc = (StringColumn) column;
            if (sc.isMax()) {
                meta = new ViewColumnMeta<>(ViewColumnType.TEXT);
            } else {
                meta = new ViewColumnMeta<>(ViewColumnType.TEXT, sc.getLength());
            }
        } else if (column instanceof BooleanColumn) {
            meta = new ViewColumnMeta<>(ViewColumnType.BIT);
        } else if (column instanceof DateTimeColumn) {
            meta = new ViewColumnMeta<>(ViewColumnType.DATE);
        } else if (column instanceof ZonedDateTimeColumn) {
            meta = new ViewColumnMeta<>(ViewColumnType.DATE_WITH_TIME_ZONE);
        } else if (column instanceof BinaryColumn) {
            meta = new ViewColumnMeta<>(ViewColumnType.BLOB);
            // This should not happen unless we introduced new types in
            // Celesta
        } else {
            throw new IllegalStateException();
        }
        meta.setNullable(column.isNullable());
        meta.setCelestaDoc(column.getCelestaDoc());
    }

    /**
     * Returns the column that the reference is pointing to.
     *
     */
    public Column getColumn() {
        return column;
    }

    /**
     * Sets the column of the reference.
     *
     * @param column  reference column
     */
    void setColumn(Column column) {
        this.column = column;
    }

    void setTableNameOrAlias(String tableNameOrAlias) {
        this.tableNameOrAlias = tableNameOrAlias;
    }

    void setColumnName(String columnName) {
        this.columnName = columnName;
    }

    @Override
    public void accept(ExprVisitor visitor) throws ParseException {
        visitor.visitFieldRef(this);
    }

}