package com.fasterxml.jackson.core.util;

import java.io.IOException;

import com.fasterxml.jackson.core.JsonGenerator;

Default linefeed-based indenter, used by DefaultPrettyPrinter (unless overridden). Uses system-specific linefeeds and 2 spaces for indentation per level.
Since:2.5
/** * Default linefeed-based indenter, used by {@link DefaultPrettyPrinter} (unless * overridden). Uses system-specific linefeeds and 2 spaces for indentation per level. * * @since 2.5 */
public class DefaultIndenter extends DefaultPrettyPrinter.NopIndenter { private static final long serialVersionUID = 1L; public final static String SYS_LF; static { String lf; try { lf = System.getProperty("line.separator"); } catch (Throwable t) { lf = "\n"; // fallback when security manager denies access } SYS_LF = lf; } public static final DefaultIndenter SYSTEM_LINEFEED_INSTANCE = new DefaultIndenter(" ", SYS_LF);
We expect to rarely get indentation deeper than this number of levels, and try not to pre-generate more indentations than needed.
/** * We expect to rarely get indentation deeper than this number of levels, * and try not to pre-generate more indentations than needed. */
private final static int INDENT_LEVELS = 16; private final char[] indents; private final int charsPerLevel; private final String eol;
Indent with two spaces and the system's default line feed
/** * Indent with two spaces and the system's default line feed */
public DefaultIndenter() { this(" ", SYS_LF); }
Create an indenter which uses the indent string to indent one level and the eol string to separate lines.
Params:
  • indent – Indentation String to prepend for a single level of indentation
  • eol – End-of-line marker to use after indented line
/** * Create an indenter which uses the <code>indent</code> string to indent one level * and the <code>eol</code> string to separate lines. * * @param indent Indentation String to prepend for a single level of indentation * @param eol End-of-line marker to use after indented line */
public DefaultIndenter(String indent, String eol) { charsPerLevel = indent.length(); indents = new char[indent.length() * INDENT_LEVELS]; int offset = 0; for (int i=0; i<INDENT_LEVELS; i++) { indent.getChars(0, indent.length(), indents, offset); offset += indent.length(); } this.eol = eol; } public DefaultIndenter withLinefeed(String lf) { if (lf.equals(eol)) { return this; } return new DefaultIndenter(getIndent(), lf); } public DefaultIndenter withIndent(String indent) { if (indent.equals(getIndent())) { return this; } return new DefaultIndenter(indent, eol); } @Override public boolean isInline() { return false; } @Override public void writeIndentation(JsonGenerator jg, int level) throws IOException { jg.writeRaw(eol); if (level > 0) { // should we err on negative values (as there's some flaw?) level *= charsPerLevel; while (level > indents.length) { // unlike to happen but just in case jg.writeRaw(indents, 0, indents.length); level -= indents.length; } jg.writeRaw(indents, 0, level); } } public String getEol() { return eol; } public String getIndent() { return new String(indents, 0, charsPerLevel); } }