sandbox/SPI/implementation-script/src/main/java/org/apache/tuscany/implementation/script/ScriptInvokerFactory.java


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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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.apache.tuscany.implementation.script;

import java.io.StringReader;
import java.util.Map;

import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;

import org.apache.tuscany.interfacedef.Operation;
import org.apache.tuscany.spi.ObjectCreationException;
import org.apache.tuscany.spi.implementation.Invoker;
import org.apache.tuscany.spi.implementation.InvokerFactory;

public class ScriptInvokerFactory implements InvokerFactory {
    
    private ScriptImplementation impl;

    public ScriptInvokerFactory(ScriptImplementation impl) {
        this.impl = impl;
    }

    public Invoker createInvoker(Operation operation) {
        return new ScriptInvoker(impl, operation);
    }

    public Object getInstance(Map<String, Object> references, Map<String, Object> properties) {
        try {
            ScriptEngineManager manager = new ScriptEngineManager();
            
            for (String referenceName : references.keySet()) {
                Object reference = references.get(referenceName);
                manager.put(referenceName, reference);
            }
            
            for (String propertyName : properties.keySet()) {
                Object propertyValue = properties.get(propertyName);
                manager.put(propertyName, propertyValue);
            }
            
            ScriptEngine engine = manager.getEngineByExtension(impl.getScriptLanguage());
            if (engine == null) {
                throw new ObjectCreationException("no script engine found for language: " + impl.getScriptLanguage());
            }
           
            engine.eval(new StringReader(impl.getScriptSrc()));
           
            return engine;
           
        } catch (ScriptException e) {
            throw new ObjectCreationException(e);
        }
    }

}