/*
* #%L
* Bio-Formats Plugins for ImageJ: a collection of ImageJ plugins including the
* Bio-Formats Importer, Bio-Formats Exporter, Bio-Formats Macro Extensions,
* Data Browser and Stack Slicer.
* %%
* Copyright (C) 2006 - 2015 Open Microscopy Environment:
* - Board of Regents of the University of Wisconsin-Madison
* - Glencoe Software, Inc.
* - University of Dundee
* %%
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program. If not, see
* <http://www.gnu.org/licenses/gpl-2.0.html>.
* #L%
*/
package loci.plugins.macro;
import ij.IJ;
import ij.macro.ExtensionDescriptor;
import ij.macro.Functions;
import ij.macro.MacroExtension;
import ij.plugin.PlugIn;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import loci.plugins.util.LibraryChecker;
import loci.plugins.util.WindowTools;
/**
* Convenience class that simplifies implemention of ImageJ macro extensions.
* It uses reflection to create an extension method for each public method in
* the implementing subclass. See {@link LociFunctions} for an example.
*
* @author Curtis Rueden ctrueden at wisc.edu
*/
public class MacroFunctions implements PlugIn, MacroExtension {
// -- Fields --
protected ExtensionDescriptor[] extensions = buildExtensions();
// -- PlugIn API methods --
@Override
public void run(String arg) {
if (!LibraryChecker.checkImageJ()) return;
if (!IJ.macroRunning()) {
IJ.error("Cannot install extensions from outside a macro.");
return;
}
Functions.registerExtensions(this);
}
// -- MacroExtension API methods --
@Override
public ExtensionDescriptor[] getExtensionFunctions() {
return extensions;
}
@Override
public String handleExtension(String name, Object[] args) {
Class<?>[] c = null;
if (args != null) {
c = new Class[args.length];
for (int i=0; i<args.length; i++) c[i] = args[i].getClass();
}
try {
getClass().getMethod(name, c).invoke(this, args);
}
catch (NoSuchMethodException exc) {
WindowTools.reportException(exc, false, "Macro error");
}
catch (IllegalAccessException exc) {
WindowTools.reportException(exc, false, "Macro error");
}
catch (InvocationTargetException exc) {
WindowTools.reportException(exc, false, "Macro error");
}
return null;
}
// -- Helper methods --
/**
* Builds the list of extensions, using reflection,
* from public methods of this class.
*/
protected ExtensionDescriptor[] buildExtensions() {
Method[] m = getClass().getMethods();
ExtensionDescriptor[] desc = new ExtensionDescriptor[m.length];
for (int i=0; i<m.length; i++) {
Class<?>[] c = m[i].getParameterTypes();
int[] types = new int[c.length];
for (int j=0; j<c.length; j++) {
if (c[j] == String.class) types[j] = ARG_STRING;
else if (c[j] == Double.class) types[j] = ARG_NUMBER;
else if (c[j] == Object[].class) types[j] = ARG_ARRAY;
else if (c[j] == String[].class) types[j] = ARG_OUTPUT + ARG_STRING;
else if (c[j] == Double[].class) types[j] = ARG_OUTPUT + ARG_NUMBER;
}
desc[i] = ExtensionDescriptor.newDescriptor(m[i].getName(), this, types);
}
return desc;
}
}