com.hazelcast.internal.json.PrettyPrint Maven / Gradle / Ivy
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package com.hazelcast.internal.json;
import java.io.IOException;
import java.io.Writer;
import java.util.Arrays;
/**
* Enables human readable JSON output by inserting whitespace between values.after commas and
* colons. Example:
*
*
* jsonValue.writeTo(writer, PrettyPrint.singleLine());
*
*/
public class PrettyPrint extends WriterConfig {
/**
* Write JSON in pretty-print, with each value on a separate line and an indentation of two
* spaces.
*/
public static final WriterConfig PRETTY_PRINT = PrettyPrint.indentWithSpaces(2);
private final char[] indentChars;
protected PrettyPrint(char[] indentChars) {
this.indentChars = indentChars;
}
/**
* Print every value on a separate line. Use tabs (\t) for indentation.
*
* @return A PrettyPrint instance for wrapped mode with tab indentation
*/
public static PrettyPrint singleLine() {
return new PrettyPrint(null);
}
/**
* Print every value on a separate line. Use the given number of spaces for indentation.
*
* @param number
* the number of spaces to use
* @return A PrettyPrint instance for wrapped mode with spaces indentation
*/
public static PrettyPrint indentWithSpaces(int number) {
if (number < 0) {
throw new IllegalArgumentException("number is negative");
}
char[] chars = new char[number];
Arrays.fill(chars, ' ');
return new PrettyPrint(chars);
}
/**
* Do not break lines, but still insert whitespace between values.
*
* @return A PrettyPrint instance for single-line mode
*/
public static PrettyPrint indentWithTabs() {
return new PrettyPrint(new char[] {'\t'});
}
@Override
protected JsonWriter createWriter(Writer writer) {
return new PrettyPrintWriter(writer, indentChars);
}
private static class PrettyPrintWriter extends JsonWriter {
private final char[] indentChars;
private int indent;
private PrettyPrintWriter(Writer writer, char[] indentChars) {
super(writer);
this.indentChars = indentChars;
}
@Override
protected void writeArrayOpen() throws IOException {
indent++;
writer.write('[');
writeNewLine();
}
@Override
protected void writeArrayClose() throws IOException {
indent--;
writeNewLine();
writer.write(']');
}
@Override
protected void writeArraySeparator() throws IOException {
writer.write(',');
if (!writeNewLine()) {
writer.write(' ');
}
}
@Override
protected void writeObjectOpen() throws IOException {
indent++;
writer.write('{');
writeNewLine();
}
@Override
protected void writeObjectClose() throws IOException {
indent--;
writeNewLine();
writer.write('}');
}
@Override
protected void writeMemberSeparator() throws IOException {
writer.write(':');
writer.write(' ');
}
@Override
protected void writeObjectSeparator() throws IOException {
writer.write(',');
if (!writeNewLine()) {
writer.write(' ');
}
}
private boolean writeNewLine() throws IOException {
if (indentChars == null) {
return false;
}
writer.write('\n');
for (int i = 0; i < indent; i++) {
writer.write(indentChars);
}
return true;
}
}
}