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SciJava Common is a shared library for SciJava software. It provides a plugin framework, with an extensible mechanism for service discovery, backed by its own annotation processor, so that plugins can be loaded dynamically. It is used by downstream projects in the SciJava ecosystem, such as ImageJ and SCIFIO.

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/*
 * #%L
 * SciJava Common shared library for SciJava software.
 * %%
 * Copyright (C) 2009 - 2017 Board of Regents of the University of
 * Wisconsin-Madison, Broad Institute of MIT and Harvard, and Max Planck
 * Institute of Molecular Cell Biology and Genetics.
 * %%
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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package org.scijava.script;

import java.util.List;

import javax.script.ScriptEngine;
import javax.script.ScriptEngineFactory;
import javax.script.ScriptEngineManager;

import org.scijava.plugin.PluginInfo;

/**
 * Abstract superclass for {@link ScriptLanguage} implementations which adapt an
 * existing {@link ScriptEngineFactory}.
 * 
 * This is useful for situations where a JSR-223-compliant script engine has
 * been provided, but whose behavior we need to extend or tweak.
 * 
 * 
 * @author Curtis Rueden
 */
public class AdaptedScriptLanguage extends AbstractScriptLanguage {

	/** The {@link ScriptEngineFactory} which this one adapts. */
	private final ScriptEngineFactory base;

	/**
	 * Creates a new {@link AdaptedScriptLanguage} wrapping the given
	 * {@link ScriptEngineFactory}.
	 */
	public AdaptedScriptLanguage(final ScriptEngineFactory base) {
		if (base == null) {
			throw new NullPointerException();
		}
		this.base = base;
	}

	/**
	 * Creates a new {@link AdaptedScriptLanguage} wrapping the
	 * {@link ScriptEngineFactory} with the given name.
	 */
	public AdaptedScriptLanguage(final String factoryName) {
		this(findFactory(factoryName));
	}

	// -- ScriptEngineFactory methods --

	@Override
	public String getEngineName() {
		return base.getEngineName();
	}

	@Override
	public String getEngineVersion() {
		return base.getEngineVersion();
	}

	@Override
	public List getExtensions() {
		return base.getExtensions();
	}

	@Override
	public List getMimeTypes() {
		return base.getMimeTypes();
	}

	@Override
	public List getNames() {
		return base.getNames();
	}

	@Override
	public String getLanguageName() {
		final PluginInfo info = getInfo();
		final String name = info == null ? null : info.getName();
		return name != null && !name.isEmpty() ? name : base.getLanguageName();
	}

	@Override
	public String getLanguageVersion() {
		return base.getLanguageVersion();
	}

	@Override
	public Object getParameter(final String key) {
		return base.getParameter(key);
	}

	@Override
	public String getMethodCallSyntax(final String obj, final String m,
		final String... args)
	{
		return base.getMethodCallSyntax(obj, m, args);
	}

	@Override
	public String getOutputStatement(final String toDisplay) {
		return base.getOutputStatement(toDisplay);
	}

	@Override
	public String getProgram(final String... statements) {
		return base.getProgram(statements);
	}

	@Override
	public ScriptEngine getScriptEngine() {
		return base.getScriptEngine();
	}

	// -- Helper methods --

	private static ScriptEngineFactory findFactory(final String factoryName) {
		final ScriptEngineManager manager = new ScriptEngineManager();
		for (final ScriptEngineFactory factory : manager.getEngineFactories()) {
			for (final String name : factory.getNames()) {
				if (factoryName.equals(name)) return factory;
			}
		}
		throw new IllegalArgumentException("No such script engine: " + factoryName);
	}

}