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/**
* ============LICENSE_START=======================================================
* org.onap.aai
* ================================================================================
* Copyright © 2017-2018 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.aai.rest.search;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversal;
import org.codehaus.groovy.ast.ClassHelper;
import org.codehaus.groovy.ast.expr.ClassExpression;
import org.codehaus.groovy.ast.expr.PropertyExpression;
import org.codehaus.groovy.control.CompilerConfiguration;
import org.codehaus.groovy.control.customizers.ASTTransformationCustomizer;
import org.codehaus.groovy.control.customizers.ImportCustomizer;
import groovy.lang.Binding;
import groovy.lang.GroovyShell;
import groovy.lang.Script;
import groovy.transform.TimedInterrupt;
/**
* Creates and returns a groovy shell with the
* configuration to statically import graph classes
*
*/
public class GremlinGroovyShellSingleton {
private final GroovyShell shell;
private GremlinGroovyShellSingleton() {
Map<String, Object> parameters = new HashMap<>();
parameters.put("value", 30000);
parameters.put("unit", new PropertyExpression(new ClassExpression(ClassHelper.make(TimeUnit.class)),"MILLISECONDS"));
ASTTransformationCustomizer custom = new ASTTransformationCustomizer(parameters, TimedInterrupt.class);
ImportCustomizer imports = new ImportCustomizer();
imports.addStaticStars(
"org.apache.tinkerpop.gremlin.process.traversal.P"
);
imports.addImports(
"org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.__",
"org.apache.tinkerpop.gremlin.structure.T",
"org.apache.tinkerpop.gremlin.process.traversal.P");
CompilerConfiguration config = new CompilerConfiguration();
config.addCompilationCustomizers(custom, imports);
this.shell = new GroovyShell(config);
}
private static class Helper {
private static final GremlinGroovyShellSingleton INSTANCE = new GremlinGroovyShellSingleton();
}
public static GremlinGroovyShellSingleton getInstance() {
return Helper.INSTANCE;
}
/**
* @param traversal
* @param params
* @return result of graph traversal
*/
public GraphTraversal<?, ?> executeTraversal (String traversal, Map<String, Object> params) {
Binding binding = new Binding(params);
Script script = shell.parse(traversal);
script.setBinding(binding);
return (GraphTraversal<?, ?>) script.run();
}
}
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