org.scijava.script.ScriptLanguageIndex Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of scijava-common Show documentation

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.

There is a newer version: 2.99.0

Show newest version

/*
 * #%L
 * SciJava Common shared library for SciJava software.
 * %%
 * Copyright (C) 2009 - 2015 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
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * #L%
 */

package org.scijava.script;

import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.script.ScriptEngineFactory;

import org.scijava.log.LogService;
import org.scijava.util.FileUtils;

/**
 * Data structure for managing registered scripting languages.
 * 
 * @author Johannes Schindelin
 * @author Curtis Rueden
 */
public class ScriptLanguageIndex extends ArrayList {

	private static final long serialVersionUID = 1L;

	private final Map byExtension =
		new HashMap();

	private final Map byName =
		new HashMap();

	private final LogService log;

	@Deprecated
	public ScriptLanguageIndex() {
		this(null);
	}

	/**
	 * Instantiates an index of the available script languages.
	 * 
	 * @param logService the log service for errors and warnings
	 */
	public ScriptLanguageIndex(final LogService logService) {
		log = logService;
	}

	public boolean add(final ScriptEngineFactory factory, final boolean gently) {
		final String duplicateName = checkDuplicate(factory);
		if (duplicateName != null) {
			if (gently) return false;
			if (log != null) {
				log.warn("Duplicate scripting language '" +
					duplicateName + "': existing=" +
					byName.get(duplicateName).getClass().getName() +
					", new=" + factory.getClass().getName());
			}
		}

		final ScriptLanguage language = wrap(factory);

		// add language names
		byName.put(language.getLanguageName(), language);
		for (final String name : language.getNames()) {
			byName.put(name, language);
		}

		// add file extensions
		for (final String extension : language.getExtensions()) {
			if ("".equals(extension)) continue;
			byExtension.put(extension, language);
		}

		return super.add(language);
	}

	public ScriptLanguage getByExtension(final String extension) {
		return byExtension.get(extension);
	}

	public ScriptLanguage getByName(final String name) {
		return byName.get(name);
	}

	public String[] getFileExtensions(final ScriptLanguage language) {
		final List extensions = language.getExtensions();
		return extensions.toArray(new String[extensions.size()]);
	}

	public boolean canHandleFile(final File file) {
		final String extension = FileUtils.getExtension(file);
		if ("".equals(extension)) return false;
		return byExtension.containsKey(extension);
	}

	public boolean canHandleFile(final String fileName) {
		final String extension = FileUtils.getExtension(fileName);
		if ("".equals(extension)) return false;
		return byExtension.containsKey(extension);
	}

	// -- Collection methods --

	@Override
	public boolean add(final ScriptLanguage language) {
		return add(language, false);
	}

	// -- Helper methods --

	private String checkDuplicate(final ScriptEngineFactory factory) {
		for (final String name : factory.getNames()) {
			if (byName.containsKey(name)) {
				return name;
			}
		}
		return null;
	}

	private ScriptLanguage wrap(final ScriptEngineFactory factory) {
		if (factory instanceof ScriptLanguage) return (ScriptLanguage) factory;
		return new AdaptedScriptLanguage(factory);
	}

}