/
Jsr223Step.java
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/
Jsr223Step.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.generic;
import java.io.Serializable;
import java.util.Objects;
import java.util.stream.Collectors;
import javax.annotation.Nullable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import com.diffplug.spotless.FormatterFunc;
import com.diffplug.spotless.FormatterStep;
import com.diffplug.spotless.JarState;
import com.diffplug.spotless.Provisioner;
public final class Jsr223Step implements java.io.Serializable {
private static final long serialVersionUID = 1L;
@Nullable
private final JarState.Promised jarState;
private final String engine;
private final String script;
private Jsr223Step(@Nullable JarState.Promised jarState, String engine, String script) {
this.jarState = jarState;
this.engine = engine;
this.script = script;
}
public static FormatterStep create(String name, @Nullable String dependency, CharSequence engine, CharSequence script, Provisioner provisioner) {
Objects.requireNonNull(name, "name");
Objects.requireNonNull(engine, "engine");
Objects.requireNonNull(script, "script");
return FormatterStep.create(name,
new Jsr223Step(dependency == null ? null : JarState.promise(() -> JarState.from(dependency, provisioner)), engine.toString(), script.toString()),
Jsr223Step::equalityState,
State::toFormatter);
}
private State equalityState() {
return new State(jarState == null ? null : jarState.get(), engine, script);
}
private static final class State implements Serializable {
private static final long serialVersionUID = 1L;
@Nullable
private final JarState jarState;
private final String engine;
private final String script;
State(@Nullable JarState jarState, CharSequence engine, CharSequence script) {
this.jarState = jarState;
this.engine = engine.toString();
this.script = script.toString();
}
FormatterFunc toFormatter() {
ScriptEngineManager scriptEngineManager;
if (jarState == null) {
scriptEngineManager = new ScriptEngineManager(ClassLoader.getSystemClassLoader());
} else {
scriptEngineManager = new ScriptEngineManager(jarState.getClassLoader());
}
ScriptEngine scriptEngine = scriptEngineManager.getEngineByName(engine);
if (scriptEngine == null) {
throw new IllegalArgumentException("Unknown script engine '" + engine + "'. Available engines: " +
scriptEngineManager.getEngineFactories().stream().flatMap(f -> f.getNames().stream()).collect(Collectors.joining(", ")));
}
// evaluate script code
return raw -> {
scriptEngine.put("source", raw);
return (String) scriptEngine.eval(script);
};
}
}
}