de.vandermeer.asciitable.CWC_LongestLine.java Source code

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Here is the source code for de.vandermeer.asciitable.CWC_LongestLine.java

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/* Copyright 2017 Sven van der Meer <vdmeer.sven@mykolab.com>
 *
 * 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 de.vandermeer.asciitable;

import java.util.LinkedList;

import org.apache.commons.lang3.ArrayUtils;
import org.apache.commons.lang3.Validate;

import de.vandermeer.skb.interfaces.document.TableRowType;
import de.vandermeer.skb.interfaces.transformers.Object_To_StrBuilder;
import de.vandermeer.skb.interfaces.transformers.String_To_ConditionalBreak;

/**
 * Calculates the width of table columns using the longest line in a column.
 * 
 * Note: this can produce strange results, especially when cell content implements render interfaces or very long lines are found.
 * In those cases use minimum and maximum column length.
 * 
 * @author     Sven van der Meer &lt;vdmeer.sven@mykolab.com&gt;
 * @version    v0.3.2 build 170502 (02-May-17) for Java 1.8
 * @since      v0.3.0
 */
public class CWC_LongestLine implements AT_ColumnWidthCalculator {

    /** Minimum widths. */
    private int[] minWidths = new int[0];

    /** Maximum widths. */
    private int[] maxWidths = new int[0];

    /**
     * Creates a new width object.
     * @param minWidth minimum column width as number of characters
     * @param maxWidth maximum column width as number of characters
     * @return self to allow for chaining
     */
    public CWC_LongestLine add(final int minWidth, final int maxWidth) {
        this.minWidths = ArrayUtils.add(this.minWidths, minWidth);
        this.maxWidths = ArrayUtils.add(this.maxWidths, maxWidth);
        return this;
    }

    @Override
    public int[] calculateColumnWidths(LinkedList<AT_Row> rows, int colNumbers, int tableWidth) {
        Validate.notNull(rows);

        int[] resultWidths = new int[colNumbers];

        // apply min width settings
        System.arraycopy(minWidths, 0, resultWidths, 0,
                minWidths.length > colNumbers ? colNumbers : minWidths.length);

        // iterate over all rows
        for (AT_Row row : rows) {
            if (row.getType() == TableRowType.CONTENT) {
                LinkedList<AT_Cell> cells = row.getCells();

                for (int i = 0; i < cells.size(); i++) {
                    if (cells.get(i).getContent() != null) {
                        String[] lines = String_To_ConditionalBreak
                                .convert(Object_To_StrBuilder.convert(cells.get(i).getContent()).toString());

                        // measuring the width of each line within a cell
                        for (String line : lines) {
                            int lineWidth = line.length() + cells.get(i).getContext().getPaddingLeft()
                                    + cells.get(i).getContext().getPaddingRight();
                            if (lineWidth > resultWidths[i]) {
                                int maxWidth = (maxWidths.length > i) ? maxWidths[i] : 0;
                                if (maxWidth < 1 || lineWidth < maxWidth) {
                                    resultWidths[i] = lineWidth;
                                } else {
                                    resultWidths[i] = maxWidth;
                                }
                            }
                        }
                    }
                }
            }
        }
        return resultWidths;
    }

}