Java List Print printTwoColumns(List left, List right, int leftWidth, int rightWidth, int sep)

Description

print Two Columns

License

Open Source License

Declaration

public static String printTwoColumns(List<String> left, List<String> right, int leftWidth, int rightWidth,
            int sep) 

Method Source Code

//package com.java2s;

import java.util.*;

public class Main {
    public static String printTwoColumns(List<String> left, List<String> right, int leftWidth, int rightWidth,
            int sep) {
        return printTwoColumns(left, right, leftWidth, rightWidth, sep, "");
    }//  w ww  .  ja va2  s  . c  o m

    public static String printTwoColumns(List<String> left, List<String> right, int leftWidth, int rightWidth,
            int sep, String betweenLines) {
        return printTwoColumns(0, left, right, leftWidth, rightWidth, sep, betweenLines);
    }

    public static String printTwoColumns(int offset, List<String> left, List<String> right, int leftWidth,
            int rightWidth, int sep, String betweenLines) {
        if (left.size() != right.size())
            throw new IllegalArgumentException();
        left = new ArrayList<>(left);
        right = new ArrayList<>(right);
        boolean breakOnNext;
        String spacer = spacer(sep), offsetSpacer = spacer(offset);
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < left.size(); ++i) {
            String le = left.get(i), ri = right.get(i);
            breakOnNext = true;
            if (le.length() >= leftWidth && ri.length() >= rightWidth) {
                int leBr = lineBreakPos(le, leftWidth), riBr = lineBreakPos(ri, rightWidth);
                String l = le.substring(0, leBr), r = right.get(i).substring(0, riBr);
                String l1 = le.substring(leBr), r1 = right.get(i).substring(riBr);
                le = l;
                ri = r;
                left.add(i + 1, l1);
                right.add(i + 1, r1);
            } else if (le.length() >= leftWidth) {
                int leBr = lineBreakPos(le, leftWidth);
                String l = le.substring(0, leBr), l1 = le.substring(leBr);
                le = l;
                left.add(i + 1, l1);
                right.add(i + 1, "");
            } else if (ri.length() >= rightWidth) {
                int riBr = lineBreakPos(ri, rightWidth);
                String r = ri.substring(0, riBr), r1 = ri.substring(riBr);
                ri = r;
                right.add(i + 1, r1);
                left.add(i + 1, "");
            } else
                breakOnNext = false;
            sb.append(offsetSpacer).append(le).append(spacer).append(spacer(leftWidth - le.length())).append(ri)
                    .append('\n');
            if (!breakOnNext)
                sb.append(betweenLines);
        }
        assert left.size() == right.size();
        return sb.toString();
    }

    public static String spacer(int sep) {
        StringBuilder sb = new StringBuilder(sep);
        for (int i = 0; i < sep; ++i)
            sb.append(" ");
        return sb.toString();
    }

    private static int lineBreakPos(String str, int width) {
        int i = width - 1;
        for (; i >= 0; --i)
            if (str.charAt(i) == ' ')
                break;
        if (i <= 3)
            return width - 1;
        return i + 1;
    }
}

Related

1. printStringList(List listToPrint)
2. printStringList(List strings)
3. printTable(List data)
4. printTopNTokens(LinkedList> list, int n)
5. printTuple(List