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Apache POI - Java API To Access Microsoft Format Files
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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.xssf.usermodel;

import org.apache.poi.ss.usermodel.ConditionalFormatting;
import org.apache.poi.ss.usermodel.ConditionalFormattingRule;
import org.apache.poi.ss.util.CellRangeAddress;
import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTConditionalFormatting;

import java.util.ArrayList;
import java.util.Collections;

public class XSSFConditionalFormatting implements ConditionalFormatting {
    private final CTConditionalFormatting _cf;
    private final XSSFSheet _sh;

    /*package*/ XSSFConditionalFormatting(XSSFSheet sh) {
        _cf = CTConditionalFormatting.Factory.newInstance();
        _sh = sh;
    }

    /*package*/ XSSFConditionalFormatting(
            XSSFSheet sh, CTConditionalFormatting cf) {
        _cf = cf;
        _sh = sh;
    }

    /*package*/  CTConditionalFormatting getCTConditionalFormatting() {
        return _cf;
    }

    /**
     * @return array of {@code CellRangeAddress}s. Never {@code null}
     */
    @Override
    public CellRangeAddress[] getFormattingRanges() {
        ArrayList lst = new ArrayList<>();
        for (Object stRef : _cf.getSqref()) {
            String[] regions = stRef.toString().split(" ");
            for (final String region : regions) {
                lst.add(CellRangeAddress.valueOf(region));
            }
        }
        return lst.toArray(new CellRangeAddress[0]);
    }

    @Override
    public void setFormattingRanges(CellRangeAddress[] ranges) {
        if (ranges == null) {
            throw new IllegalArgumentException("cellRanges must not be null");
        }
        final StringBuilder sb = new StringBuilder();
        boolean first = true;
        for (CellRangeAddress range : ranges) {
            if (!first) {
                sb.append(' ');
            } else {
                first = false;
            }
            sb.append(range.formatAsString());
        }
        _cf.setSqref(Collections.singletonList(sb.toString()));
    }

    /**
     * Replaces an existing Conditional Formatting rule at position idx.
     * Excel allows to create up to 3 Conditional Formatting rules.
     * This method can be useful to modify existing  Conditional Formatting rules.
     *
     * @param idx    position of the rule. Should be between 0 and 2.
     * @param cfRule - Conditional Formatting rule
     */
    @Override
    public void setRule(int idx, ConditionalFormattingRule cfRule) {
        XSSFConditionalFormattingRule xRule = (XSSFConditionalFormattingRule) cfRule;
        _cf.getCfRuleArray(idx).set(xRule.getCTCfRule());
    }

    /**
     * Add a Conditional Formatting rule.
     * Excel allows to create up to 3 Conditional Formatting rules.
     *
     * @param cfRule - Conditional Formatting rule
     */
    @Override
    public void addRule(ConditionalFormattingRule cfRule) {
        XSSFConditionalFormattingRule xRule = (XSSFConditionalFormattingRule) cfRule;
        _cf.addNewCfRule().set(xRule.getCTCfRule());
    }

    /**
     * @return the Conditional Formatting rule at position idx.
     */
    @Override
    public XSSFConditionalFormattingRule getRule(int idx) {
        return new XSSFConditionalFormattingRule(_sh, _cf.getCfRuleArray(idx));
    }

    /**
     * @return number of Conditional Formatting rules.
     */
    @Override
    public int getNumberOfRules() {
        return _cf.sizeOfCfRuleArray();
    }

    @Override
    public String toString() {
        return _cf.toString();
    }
}