StringBlockFormatter.java

package org.utplsql.cli.log;

public class StringBlockFormatter {

    private String headline;
    private final StringBuilder content = new StringBuilder();

    public StringBlockFormatter() {
    }

    public StringBlockFormatter(String headline) {
        setHeadline(headline);
    }

    public void setHeadline(String headline) {
        this.headline = headline;
    }

    public String getHeadline() {
        return headline;
    }

    public void append(CharSequence seq) {
        content.append(seq);
    }

    public void appendLine(CharSequence seq) {
        content.append(seq).append("\n");
    }

    private int getMaxLength(String[] lines) {
        int len = 0;
        for (String line : lines) {
            if (line.length() > len) {
                len = line.length();
            }
        }

        if (headline.length() > (len + 6)) {
            len = headline.length();
        }

        return len;
    }

    public static String getEncapsulatedLine(String line, int maxLength) {
        return String.format("#   %-" + maxLength + "s   #", line);
    }

    public static String getEncapsulatedHeadline(String headline, int maxLength) {
        String content = new String(new char[maxLength + 8]).replace("\0", "#");
        if (headline == null || headline.isEmpty()) {
            return content;
        }

        headline = " " + headline + " ";
        int start = (int) Math.floor(
                (float) content.length() / 2f
                        - (float) headline.length() / 2f
        );
        int end = start + headline.length();

        return content.substring(0, start)
                + headline
                + content.substring(end);
    }

    public String toString() {

        String[] lines = content.toString().split("\n");
        int maxLen = getMaxLength(lines);

        StringBuilder sb = new StringBuilder();

        sb.append(getEncapsulatedHeadline(headline, maxLen)).append("\n");
        sb.append(getEncapsulatedLine("", maxLen)).append("\n");
        for (String line : lines) {
            sb.append(getEncapsulatedLine(line, maxLen)).append("\n");
        }
        sb.append(getEncapsulatedLine("", maxLen)).append("\n");
        sb.append(getEncapsulatedHeadline("", maxLen));

        return sb.toString();
    }
}