no.hasmac.jsonld.json.JsonCanonicalizer Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of hasmac-json-ld Show documentation
Show all versions of hasmac-json-ld Show documentation
A more performant JSON-LD 1.1 Processor & API forked from Titanium JSON-LD.
The newest version!
/*
* Copyright 2020 APICATALOG and HASMAC.
*
* 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.
*
* SPDX-License-Identifier: Apache-2.0
*/
package no.hasmac.jsonld.json;
import jakarta.json.JsonArray;
import jakarta.json.JsonNumber;
import jakarta.json.JsonObject;
import jakarta.json.JsonValue;
import no.hasmac.jsonld.lang.Utils;
import no.hasmac.rdf.io.nquad.NQuadsWriter;
import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.math.BigDecimal;
import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.util.Locale;
/**
*
* @see JSON Canonicalization Scheme (JCS)
*
*/
public final class JsonCanonicalizer {
private static final DecimalFormat eFormatBigDecimal =
new DecimalFormat("0E00", new DecimalFormatSymbols(Locale.ENGLISH));
private static final DecimalFormat eFormat =
new DecimalFormat("0.#######", new DecimalFormatSymbols(Locale.ENGLISH));
private JsonCanonicalizer() {
}
public static String canonicalize(final JsonValue value) {
final StringWriter writer = new StringWriter();
try {
canonicalize(value, writer);
} catch (IOException e) {
// ignore
}
return writer.toString();
}
private static void canonicalize(final JsonValue value, final Writer writer) throws IOException {
if (JsonUtils.isNull(value)) {
writer.write("null");
} else if (JsonUtils.isScalar(value)) {
if (JsonUtils.isNumber(value)) {
canonicalizeNumber((JsonNumber)value, writer);
} else {
writer.write(value.toString());
}
} else if (JsonUtils.isArray(value)) {
canonicalizeArray(value.asJsonArray(), writer);
} else if (JsonUtils.isObject(value)) {
canonicalizeObject(value.asJsonObject(), writer);
}
}
private static void canonicalizeNumber(final JsonNumber number, final Writer writer) throws IOException {
String numberString;
if (number.bigDecimalValue().compareTo(BigDecimal.ZERO) == 0) {
numberString = "0";
} else if (number.bigDecimalValue().compareTo(BigDecimal.ONE.movePointRight(21)) >= 0) {
numberString = eFormatBigDecimal.format(number.bigDecimalValue()).replace("E", "e+");
} else if (number.bigDecimalValue().compareTo(BigDecimal.ONE.movePointLeft(21)) <= 0) {
numberString = eFormatBigDecimal.format(number.bigDecimalValue()).toLowerCase();
} else {
numberString = eFormat.format(number.bigDecimalValue());
}
writer.write(numberString);
}
private static void canonicalizeArray(final JsonArray value, final Writer writer) throws IOException {
boolean next = false;
writer.write("[");
for (JsonValue item : value.asJsonArray()) {
if (next) {
writer.write(",");
}
canonicalize(item, writer);
next = true;
}
writer.write("]");
}
private static void canonicalizeObject(final JsonObject value, final Writer writer) throws IOException {
boolean next = false;
writer.write("{");
for (String propertyName : Utils.index(value.keySet(), true)) {
if (next) {
writer.write(",");
}
writer.write("\"");
writer.write(NQuadsWriter.escape(propertyName));
writer.write("\":");
JsonValue propertyValue = value.get(propertyName);
canonicalize(propertyValue, writer);
next = true;
}
writer.write("}");
}
}