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/*
Copyright (c) 2008 Arno Haase.
All rights reserved. This program and the accompanying materials
are made available under the terms of the Eclipse Public License v1.0
which accompanies this distribution, and is available at
http://www.eclipse.org/legal/epl-v10.html
Contributors:
Arno Haase - initial API and implementation
*/
package org.eclipse.xtend.backend.functions;
import java.util.List;
import org.eclipse.xtend.backend.common.BackendType;
import org.eclipse.xtend.backend.common.ExecutionContext;
import org.eclipse.xtend.backend.common.ExpressionBase;
import org.eclipse.xtend.backend.common.Function;
import org.eclipse.xtend.backend.common.FunctionDefContext;
import org.eclipse.xtend.backend.common.LocalVarContext;
/**
*
* @author Arno Haase (http://www.haase-consulting.com)
*/
public final class SourceDefinedFunction implements Function {
private final String _name;
private final List<String> _paramNames;
private final List<BackendType> _paramTypes;
private final FunctionDefContext _defContext;
private final ExpressionBase _def;
private final boolean _cached;
private final ExpressionBase _guard;
public SourceDefinedFunction (String name, List<String> paramNames, List<BackendType> paramTypes, FunctionDefContext defContext, ExpressionBase def, boolean cached, ExpressionBase guard) {
_name = name;
_paramNames = paramNames;
_paramTypes = paramTypes;
_defContext = defContext;
_def = def;
_cached = cached;
_guard = guard;
}
public boolean isCached () {
return _cached;
}
public List<BackendType> getParameterTypes() {
return _paramTypes;
}
public FunctionDefContext getFunctionDefContext () {
return _defContext;
}
public Object invoke (ExecutionContext ctx, Object[] params) {
if (_defContext == ctx.getFunctionDefContext())
return invokeWithExistingFdc (ctx, params);
else {
final FunctionDefContext oldFdc = ctx.getFunctionDefContext ();
try {
ctx.setFunctionDefContext (_defContext);
return invokeWithExistingFdc(ctx, params);
}
finally {
ctx.setFunctionDefContext (oldFdc);
}
}
}
private Object invokeWithExistingFdc (ExecutionContext ctx, Object[] params) {
final LocalVarContext lvc = new LocalVarContext ();
for (int i=0; i<_paramNames.size(); i++) {
lvc.getLocalVars().put(_paramNames.get(i), params[i]);
}
final LocalVarContext oldLvc = ctx.getLocalVarContext();
try {
ctx.setLocalVarContext(lvc);
return _def.evaluate(ctx);
}
finally {
ctx.setLocalVarContext(oldLvc);
}
}
public ExpressionBase getGuard() {
return _guard;
}
@Override
public String toString () {
return "SourceDefinedFunction '" + _name + "' " + _paramTypes;
}
}
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