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/*
* Licensed to Elastic Search and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Elastic Search licenses this
* file to you 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 org.elasticsearch.script.mvel;
import org.elasticsearch.common.component.AbstractComponent;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.math.UnboxedMathUtils;
import org.elasticsearch.common.mvel2.MVEL;
import org.elasticsearch.common.mvel2.ParserContext;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.script.ExecutableScript;
import org.elasticsearch.script.ScriptEngineService;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.Map;
/**
* @author kimchy (shay.banon)
*/
public class MvelScriptEngineService extends AbstractComponent implements ScriptEngineService {
private final ParserContext parserContext;
@Inject public MvelScriptEngineService(Settings settings) {
super(settings);
parserContext = new ParserContext();
parserContext.addPackageImport("java.util");
parserContext.addPackageImport("org.elasticsearch.common.trove");
parserContext.addPackageImport("org.elasticsearch.common.joda");
parserContext.addImport("time", MVEL.getStaticMethod(System.class, "currentTimeMillis", new Class[0]));
// unboxed version of Math, better performance since conversion from boxed to unboxed my mvel is not needed
for (Method m : UnboxedMathUtils.class.getMethods()) {
if ((m.getModifiers() & Modifier.STATIC) > 0) {
parserContext.addImport(m.getName(), m);
}
}
}
@Override public void close() {
// nothing to do here...
}
@Override public String[] types() {
return new String[]{"mvel"};
}
@Override public String[] extensions() {
return new String[]{"mvel"};
}
@Override public Object compile(String script) {
return MVEL.compileExpression(script, parserContext);
}
@Override public Object execute(Object compiledScript, Map vars) {
return MVEL.executeExpression(compiledScript, vars);
}
@Override public ExecutableScript executable(Object compiledScript, Map vars) {
return new MvelExecutableScript(compiledScript, vars);
}
@Override public Object unwrap(Object value) {
return value;
}
public static class MvelExecutableScript implements ExecutableScript {
private final Object compiledScript;
private final Map vars;
public MvelExecutableScript(Object compiledScript, Map vars) {
this.compiledScript = compiledScript;
this.vars = vars;
}
@Override public Object run() {
return MVEL.executeExpression(compiledScript, vars);
}
@Override public Object run(Map vars) {
vars.putAll(this.vars);
return MVEL.executeExpression(compiledScript, vars);
}
@Override public Object unwrap(Object value) {
return value;
}
}
}