| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.metamodel.data; |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| import javax.swing.table.TableModel; |
| |
| import org.apache.metamodel.MetaModelHelper; |
| import org.apache.metamodel.query.SelectItem; |
| import org.apache.metamodel.schema.Column; |
| import org.apache.metamodel.util.BaseObject; |
| |
| /** |
| * Abstract DataSet implementation. Provides convenient implementations of |
| * trivial method and reusable parts of non-trivial methods of a DataSet. |
| */ |
| public abstract class AbstractDataSet extends BaseObject implements DataSet { |
| |
| private final DataSetHeader _header; |
| |
| /** |
| * @deprecated use one of the other constructors, to provide header |
| * information. |
| */ |
| @Deprecated |
| public AbstractDataSet() { |
| _header = null; |
| } |
| |
| public AbstractDataSet(SelectItem[] selectItems) { |
| this(Arrays.asList(selectItems)); |
| } |
| |
| public AbstractDataSet(List<SelectItem> selectItems) { |
| this(new CachingDataSetHeader(selectItems)); |
| } |
| |
| /** |
| * Constructor appropriate for dataset implementations that wrap other |
| * datasets, such as the {@link MaxRowsDataSet}, {@link FilteredDataSet} and |
| * more. |
| * |
| * @param dataSet |
| */ |
| public AbstractDataSet(DataSet dataSet) { |
| if (dataSet instanceof AbstractDataSet) { |
| _header = ((AbstractDataSet) dataSet).getHeader(); |
| } else { |
| _header = new CachingDataSetHeader(Arrays.asList(dataSet.getSelectItems())); |
| } |
| } |
| |
| public AbstractDataSet(DataSetHeader header) { |
| _header = header; |
| } |
| |
| public AbstractDataSet(Column[] columns) { |
| this(MetaModelHelper.createSelectItems(columns)); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public SelectItem[] getSelectItems() { |
| return getHeader().getSelectItems(); |
| } |
| |
| protected DataSetHeader getHeader() { |
| return _header; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public final int indexOf(SelectItem item) { |
| return getHeader().indexOf(item); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public void close() { |
| // do nothing |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public final TableModel toTableModel() { |
| TableModel tableModel = new DataSetTableModel(this); |
| return tableModel; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public final List<Object[]> toObjectArrays() { |
| try { |
| List<Object[]> objects = new ArrayList<Object[]>(); |
| while (next()) { |
| Row row = getRow(); |
| objects.add(row.getValues()); |
| } |
| return objects; |
| } finally { |
| close(); |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public String toString() { |
| return "DataSet[selectItems=" + Arrays.toString(getSelectItems()) + "]"; |
| } |
| |
| @Override |
| protected void decorateIdentity(List<Object> identifiers) { |
| identifiers.add(getClass()); |
| identifiers.add(getSelectItems()); |
| } |
| |
| @Override |
| public List<Row> toRows() { |
| try { |
| List<Row> result = new ArrayList<Row>(); |
| while (next()) { |
| result.add(getRow()); |
| } |
| return result; |
| } finally { |
| close(); |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public Iterator<Row> iterator() { |
| return new DataSetIterator(this); |
| } |
| } |