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/* gnu.classpath.tools.gjdoc.expr.IdentifierExpression
Copyright (C) 2004 Free Software Foundation, Inc.
This file is part of GNU Classpath.
GNU Classpath 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, or (at your option)
any later version.
GNU Classpath 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 GNU Classpath; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
package gnu.classpath.tools.gjdoc.expr;
class IdentifierExpression
implements Expression
{
private String identifier;
public IdentifierExpression(String identifier)
{
this.identifier = identifier;
}
public ConstantExpression evaluate(Context context)
throws IllegalExpressionException
{
Object value = context.getEvaluatorEnvironment().getValue(identifier, context.getVisitedFields());
if (value instanceof Byte) {
return new ConstantByte(((Byte)value).byteValue());
}
else if (value instanceof Short) {
return new ConstantShort(((Short)value).shortValue());
}
else if (value instanceof Integer) {
return new ConstantInteger(((Integer)value).intValue());
}
else if (value instanceof Long) {
return new ConstantLong(((Long)value).longValue());
}
else if (value instanceof Float) {
return new ConstantFloat(((Float)value).floatValue());
}
else if (value instanceof Double) {
return new ConstantDouble(((Double)value).doubleValue());
}
else if (value instanceof Boolean) {
return new ConstantBoolean(((Boolean)value).booleanValue());
}
else if (value instanceof Character) {
return new ConstantChar(((Character)value).charValue());
}
else if (value instanceof String) {
return new ConstantString((String)value);
}
else if (null != value) {
throw new IllegalExpressionException("Unsupported type " + value.getClass().getName() + " for identifier " + identifier);
}
else {
throw new IllegalExpressionException("Cannot resolve identifier " + identifier);
}
}
}
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