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- /*
- * ====================================================================
- * 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.poi.ss.usermodel.charts;
-
- import org.apache.poi.ss.usermodel.*;
- import org.apache.poi.ss.util.CellRangeAddress;
- import org.apache.poi.util.Beta;
-
- /**
- * Class {@code DataSources} is a factory for {@link ChartDataSource} instances.
- *
- * @author Roman Kashitsyn
- */
- @Beta
- public class DataSources {
-
- private DataSources() {
- }
-
- public static <T> ChartDataSource<T> fromArray(T[] elements) {
- return new ArrayDataSource<T>(elements);
- }
-
- public static ChartDataSource<Number> fromNumericCellRange(Sheet sheet, CellRangeAddress cellRangeAddress) {
- return new AbstractCellRangeDataSource<Number>(sheet, cellRangeAddress) {
- public Number getPointAt(int index) {
- CellValue cellValue = getCellValueAt(index);
- if (cellValue != null && cellValue.getCellTypeEnum() == CellType.NUMERIC) {
- return Double.valueOf(cellValue.getNumberValue());
- } else {
- return null;
- }
- }
-
- public boolean isNumeric() {
- return true;
- }
- };
- }
-
- public static ChartDataSource<String> fromStringCellRange(Sheet sheet, CellRangeAddress cellRangeAddress) {
- return new AbstractCellRangeDataSource<String>(sheet, cellRangeAddress) {
- public String getPointAt(int index) {
- CellValue cellValue = getCellValueAt(index);
- if (cellValue != null && cellValue.getCellTypeEnum() == CellType.STRING) {
- return cellValue.getStringValue();
- } else {
- return null;
- }
- }
-
- public boolean isNumeric() {
- return false;
- }
- };
- }
-
- private static class ArrayDataSource<T> implements ChartDataSource<T> {
-
- private final T[] elements;
-
- public ArrayDataSource(T[] elements) {
- this.elements = elements.clone();
- }
-
- public int getPointCount() {
- return elements.length;
- }
-
- public T getPointAt(int index) {
- return elements[index];
- }
-
- public boolean isReference() {
- return false;
- }
-
- public boolean isNumeric() {
- Class<?> arrayComponentType = elements.getClass().getComponentType();
- return (Number.class.isAssignableFrom(arrayComponentType));
- }
-
- public String getFormulaString() {
- throw new UnsupportedOperationException("Literal data source can not be expressed by reference.");
- }
- }
-
- private abstract static class AbstractCellRangeDataSource<T> implements ChartDataSource<T> {
- private final Sheet sheet;
- private final CellRangeAddress cellRangeAddress;
- private final int numOfCells;
- private FormulaEvaluator evaluator;
-
- protected AbstractCellRangeDataSource(Sheet sheet, CellRangeAddress cellRangeAddress) {
- this.sheet = sheet;
- // Make copy since CellRangeAddress is mutable.
- this.cellRangeAddress = cellRangeAddress.copy();
- this.numOfCells = this.cellRangeAddress.getNumberOfCells();
- this.evaluator = sheet.getWorkbook().getCreationHelper().createFormulaEvaluator();
- }
-
- public int getPointCount() {
- return numOfCells;
- }
-
- public boolean isReference() {
- return true;
- }
-
- public String getFormulaString() {
- return cellRangeAddress.formatAsString(sheet.getSheetName(), true);
- }
-
- protected CellValue getCellValueAt(int index) {
- if (index < 0 || index >= numOfCells) {
- throw new IndexOutOfBoundsException("Index must be between 0 and " +
- (numOfCells - 1) + " (inclusive), given: " + index);
- }
- int firstRow = cellRangeAddress.getFirstRow();
- int firstCol = cellRangeAddress.getFirstColumn();
- int lastCol = cellRangeAddress.getLastColumn();
- int width = lastCol - firstCol + 1;
- int rowIndex = firstRow + index / width;
- int cellIndex = firstCol + index % width;
- Row row = sheet.getRow(rowIndex);
- return (row == null) ? null : evaluator.evaluate(row.getCell(cellIndex));
- }
- }
- }
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