12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364 |
- /*
- Copyright (c) 2018 James Ahlborn
-
- Licensed under the Apache License, Version 2.0 (the "License");
- you may not use this file except in compliance with the License.
- You may obtain a copy of the License at
-
- http://www.apache.org/licenses/LICENSE-2.0
-
- Unless required by applicable law or agreed to in writing, software
- distributed under the License is distributed on an "AS IS" BASIS,
- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- See the License for the specific language governing permissions and
- limitations under the License.
- */
-
- package com.healthmarketscience.jackcess.impl;
-
- import com.healthmarketscience.jackcess.expr.EvalException;
- import com.healthmarketscience.jackcess.expr.Identifier;
- import com.healthmarketscience.jackcess.expr.Value;
-
- /**
- *
- * @author James Ahlborn
- */
- public abstract class RowEvalContext extends BaseEvalContext
- {
- private Object[] _row;
-
- public RowEvalContext(DatabaseImpl db) {
- super(db.getEvalContext());
- }
-
- protected void setRow(Object[] row) {
- _row = row;
- }
-
- protected void reset() {
- _row = null;
- }
-
- @Override
- public Value getIdentifierValue(Identifier identifier) {
-
- TableImpl table = getTable();
-
- // we only support getting column values in this table from the current
- // row
- if(!table.isThisTable(identifier) ||
- (identifier.getPropertyName() != null)) {
- throw new EvalException("Cannot access fields outside this table for " +
- identifier);
- }
-
- ColumnImpl col = table.getColumn(identifier.getObjectName());
-
- Object val = col.getRowValue(_row);
-
- return toValue(val, col.getType());
- }
-
- protected abstract TableImpl getTable();
- }
|