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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 both ImageJ and SCIFIO.
/*
* #%L
* SciJava Common shared library for SciJava software.
* %%
* Copyright (C) 2009 - 2016 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
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package org.scijava.script;
import java.io.Reader;
import javax.script.Bindings;
import javax.script.ScriptContext;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineFactory;
import javax.script.ScriptException;
import org.scijava.log.LogService;
import org.scijava.log.StderrLogService;
/**
* This class implements dummy versions for ScriptEngine's methods that are not
* needed by the SciJava scripting framework.
*
* @author Johannes Schindelin
*/
public abstract class AbstractScriptEngine implements ScriptEngine {
// Abstract methods
@Override
public abstract Object eval(String script) throws ScriptException;
@Override
public abstract Object eval(Reader reader) throws ScriptException;
// Fields
protected Bindings engineScopeBindings;
protected ScriptContext scriptContext = new AbstractScriptContext();
private LogService log;
// log service
public synchronized LogService log() {
if (log == null) {
log = new StderrLogService();
}
return log;
}
public void setLogService(final LogService log) {
if (log != null) this.log = log;
}
// Bindings
@Override
public Object get(final String key) {
return engineScopeBindings.get(key);
}
@Override
public Bindings getBindings(final int scope) {
if (scope == ScriptContext.ENGINE_SCOPE) return engineScopeBindings;
throw new UnsupportedOperationException();
}
@Override
public void put(final String key, final Object value) {
engineScopeBindings.put(key, value);
}
// ScriptContext
@Override
public ScriptContext getContext() {
return scriptContext;
}
@Override
public void setContext(final ScriptContext context) {
scriptContext = context;
}
// (Possibly) unsupported operations
// (subclasses may, or may not, override with proper implementations)
// The SciJava scripting framework does not require them to work properly.
@Override
public ScriptEngineFactory getFactory() {
throw new UnsupportedOperationException();
}
@Override
public Object eval(final String script, final ScriptContext context)
throws ScriptException
{
throw new UnsupportedOperationException();
}
@Override
public Object eval(final Reader reader, final ScriptContext context)
throws ScriptException
{
throw new UnsupportedOperationException();
}
@Override
public Bindings createBindings() {
throw new UnsupportedOperationException();
}
@Override
public Object eval(final String script, final Bindings n)
throws ScriptException
{
throw new UnsupportedOperationException();
}
@Override
public Object eval(final Reader reader, final Bindings n)
throws ScriptException
{
throw new UnsupportedOperationException();
}
@Override
public void setBindings(final Bindings bindings, final int scope) {
throw new UnsupportedOperationException();
}
}
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