/*
* Copyright 2013, 2014 Deutsche Nationalbibliothek
*
* 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 org.culturegraph.mf.scripting;
import java.io.FileNotFoundException;
import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
import org.culturegraph.mf.commons.ResourceUtil;
import org.culturegraph.mf.framework.FluxCommand;
import org.culturegraph.mf.framework.MetafactureException;
import org.culturegraph.mf.framework.ObjectReceiver;
import org.culturegraph.mf.framework.annotations.Description;
import org.culturegraph.mf.framework.annotations.In;
import org.culturegraph.mf.framework.annotations.Out;
import org.culturegraph.mf.framework.helpers.DefaultObjectPipe;
/**
* Executes the function process(obj) in a given jscript.
*
* @author Markus Geipel
*
*/
@Description("executes the function process(obj) in a given jscript")
@In(Object.class)
@Out(Object.class)
@FluxCommand("jscript")
public final class JScriptObjectPipe extends DefaultObjectPipe<Object, ObjectReceiver<Object>> {
private static final String PROCESS = "process";
private String invoke = PROCESS;
private Invocable invocable;
public JScriptObjectPipe(final String script) {
setScript(script);
}
public void setInvoke(final String invoke) {
this.invoke = invoke;
}
private void setScript(final String file) {
final ScriptEngineManager manager = new ScriptEngineManager();
final ScriptEngine engine = manager.getEngineByName("JavaScript");
try {
// LOG.info("loading code from '" + file + "'");
engine.eval(ResourceUtil.getReader(file));
} catch (ScriptException e) {
throw new MetafactureException("Error in script", e);
} catch (FileNotFoundException e) {
throw new MetafactureException("Error loading script '" + file + "'", e);
}
invocable = (Invocable) engine;
}
@Override
public void process(final Object obj) {
assert !isClosed();
try {
// LOG.info("processing: " + value);
final Object retObj = invocable.invokeFunction(invoke, obj);
// LOG.info("returning: " + obj);
getReceiver().process(retObj);
} catch (ScriptException e) {
throw new MetafactureException("Error in script while evaluating 'process' method", e);
} catch (NoSuchMethodException e) {
throw new MetafactureException("'process' method is missing in script", e);
}
}
}