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JsonSimpleStep.java
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JsonSimpleStep.java
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/*
* Copyright 2021-2024 DiffPlug
*
* 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.
*/
package com.diffplug.spotless.json;
import java.io.Serializable;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Objects;
import com.diffplug.spotless.FormatterFunc;
import com.diffplug.spotless.FormatterStep;
import com.diffplug.spotless.JarState;
import com.diffplug.spotless.Provisioner;
/**
* Simple JSON formatter which reformats the file according to the org.json library's default pretty-printing, but has no ability to customise more than the indentation size.
*/
public final class JsonSimpleStep implements java.io.Serializable {
private static final long serialVersionUID = 1L;
private static final String MAVEN_COORDINATE = "org.json:json:";
private static final String DEFAULT_VERSION = "20210307";
public static final String NAME = "jsonSimple";
private final JarState.Promised jarState;
private final int indentSpaces;
private JsonSimpleStep(JarState.Promised jarState, int indentSpaces) {
this.indentSpaces = indentSpaces;
this.jarState = jarState;
}
public static FormatterStep create(int indent, Provisioner provisioner) {
Objects.requireNonNull(provisioner, "provisioner cannot be null");
return FormatterStep.create(NAME,
new JsonSimpleStep(JarState.promise(() -> JarState.from(MAVEN_COORDINATE + DEFAULT_VERSION, provisioner)), indent),
JsonSimpleStep::equalityState,
State::toFormatter);
}
private State equalityState() {
return new State(jarState.get(), indentSpaces);
}
private static final class State implements Serializable {
private static final long serialVersionUID = 1L;
private final int indentSpaces;
private final JarState jarState;
State(JarState jarState, int indent) {
this.jarState = jarState;
this.indentSpaces = indent;
}
FormatterFunc toFormatter() {
Method objectToString;
Method arrayToString;
Constructor<?> objectConstructor;
Constructor<?> arrayConstructor;
try {
ClassLoader classLoader = jarState.getClassLoader();
Class<?> jsonObject = classLoader.loadClass("org.json.JSONObject");
Class<?>[] constructorArguments = new Class[]{String.class};
objectConstructor = jsonObject.getConstructor(constructorArguments);
objectToString = jsonObject.getMethod("toString", int.class);
Class<?> jsonArray = classLoader.loadClass("org.json.JSONArray");
arrayConstructor = jsonArray.getConstructor(constructorArguments);
arrayToString = jsonArray.getMethod("toString", int.class);
} catch (ClassNotFoundException | NoSuchMethodException e) {
throw new IllegalStateException("There was a problem preparing org.json dependencies", e);
}
return s -> {
if (s.isEmpty()) {
return s;
}
char first = s.charAt(0);
if (first == '{') {
return format(objectConstructor, objectToString, s);
}
if (first == '[') {
return format(arrayConstructor, arrayToString, s);
}
throw new IllegalArgumentException(String.format("Unable to determine JSON type, expected a '{' or '[' but found '%s'", first));
};
}
private String format(Constructor<?> constructor, Method toString, String input) throws Exception {
try {
Object parsed = constructor.newInstance(input);
return toString.invoke(parsed, indentSpaces) + "\n";
} catch (InvocationTargetException e) {
throw new IllegalArgumentException("Unable to format JSON", e);
}
}
}
}