guru.nidi.graphviz.engine.GraphvizNashornEngine Maven / Gradle / Ivy
/*
* Copyright © 2015 Stefan Niederhauser ([email protected])
*
* 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 guru.nidi.graphviz.engine;
import javax.script.*;
import java.io.InputStream;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import static guru.nidi.graphviz.engine.IoUtils.readStream;
class GraphvizNashornEngine extends AbstractJsGraphvizEngine {
private static final ScriptEngine ENGINE = new ScriptEngineManager().getEngineByExtension("js");
private static final ThreadLocal HANDLER = new ThreadLocal<>();
private static final Pattern JAVA_18_PATTERN = Pattern.compile("1.8.0_(\\d+).*");
GraphvizNashornEngine() {
super(false);
final String version = System.getProperty("java.version");
final Matcher matcher = JAVA_18_PATTERN.matcher(version);
if (matcher.matches() && Integer.parseInt(matcher.group(1)) < 40) {
throw new GraphvizException("You are using an old version of java 1.8. Please update it.");
}
}
@Override
protected String jsExecute(String jsCall) {
try {
if (HANDLER.get() == null) {
HANDLER.set(new ResultHandler());
}
ENGINE.getBindings(ScriptContext.ENGINE_SCOPE).put("handler", HANDLER.get());
ENGINE.eval(jsCall);
return HANDLER.get().waitFor();
} catch (ScriptException e) {
throw new GraphvizException("Problem executing graphviz", e);
}
}
@Override
protected void doInit() throws Exception {
try (final InputStream api = getClass().getResourceAsStream("/net/arnx/nashorn/lib/promise.js")) {
ENGINE.eval(readStream(api));
}
ENGINE.eval(jsVizCode());
ENGINE.eval("var graphviz = Java.type('guru.nidi.graphviz.engine.GraphvizJdkEngine');"
+ "function result(r){ handler.setResult(r); }"
+ "function error(r){ handler.setError(r); }");
ENGINE.eval(jsInitEnv());
execute("digraph g { a -> b; }", Options.create(), null);
}
}
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