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/*
* MethodCall.java 1.0
*
* Jun 20, 1997 by mich
* Sep 29, 1997 by bv
* Oct 10, 1997 by mich
*
* @see io.devnulllabs.openjava.ptree.ParseTree
* @version 1.0 last updated: Oct 10, 1997
* @author Michiaki Tatsubori
*/
package io.devnulllabs.openjava.ptree;
import io.devnulllabs.openjava.mop.Environment;
import io.devnulllabs.openjava.mop.NoSuchMemberException;
import io.devnulllabs.openjava.mop.OJClass;
import io.devnulllabs.openjava.mop.OJMethod;
import io.devnulllabs.openjava.mop.Signature;
import io.devnulllabs.openjava.ptree.util.ParseTreeVisitor;
/**
* The <code>MethodCall</code> class represents
* a method call expression.
*
* @see io.devnulllabs.openjava.ptree.NonLeaf
* @see io.devnulllabs.openjava.ptree.Expression
*/
public class MethodCall extends NonLeaf implements Expression {
/**
* Allocates a new method call expression object.
*
* @param expr the expression which indicates an object or
* a class. This may be null for invocation on 'this'.
* @param name the method name.
* @param args the argumetns for this method.
*/
public MethodCall(Expression expr, String name, ExpressionList args) {
super();
if (args == null)
args = new ExpressionList();
set(expr, null, name, args);
}
/**
* Allocates a new method call expression for 'this'.
* This is equivalent to:
* <pre>
* new MethodCall( (Expression) null, name, args )
* </pre>
*
* @param name the method name.
* @param args the argumetns for this method.
*/
public MethodCall(String name, ExpressionList args) {
this((Expression) null, name, args);
}
/**
* Allocates a new method call expression object.
*
* @param name the method name.
* @param args the argumetns for this method.
*/
public MethodCall(TypeName type, String name, ExpressionList args) {
super();
if (args == null)
args = new ExpressionList();
set(null, type, name, args);
}
public MethodCall(OJClass clazz, String name, ExpressionList args) {
this(TypeName.forOJClass(clazz), name, args);
}
MethodCall() {
super();
}
/**
* Gets the expression accessed.
*
* @return the expression accessed.
*/
public Expression getReferenceExpr() {
return (Expression) elementAt(0);
}
/**
* Sets the expression accessed.
*
* @param expr the expression accessed.
*/
public void setReferenceExpr(Expression expr) {
setElementAt(expr, 0);
setElementAt(null, 1);
}
public TypeName getReferenceType() {
return (TypeName) elementAt(1);
}
public void setReferenceType(TypeName type) {
setElementAt(null, 0);
setElementAt(type, 1);
}
/**
* Gets the method name.
*
* @return the method name.
*/
public String getName() {
return (String) elementAt(2);
}
/**
* Sets the method name.
*
* @param name the method name.
*/
public void setName(String name) {
setElementAt(name, 2);
}
/**
* Gets the arguments for this method.
*
* @return the expression list as the arguments.
*/
public ExpressionList getArguments() {
return (ExpressionList) elementAt(3);
}
/**
* Sets the arguments for this method.
*
* @param exprs the expression list as the arguments.
*/
public void setArguments(ExpressionList exprs) {
if (exprs == null)
exprs = new ExpressionList();
setElementAt(exprs, 3);
}
public void accept(ParseTreeVisitor v) throws ParseTreeException {
v.visit(this);
}
public OJClass getType(Environment env) throws Exception {
OJClass selftype = env.lookupClass(env.currentClassName());
Expression refexpr = getReferenceExpr();
String name = getName();
OJClass reftype = null;
if (refexpr != null) {
reftype = refexpr.getType(env);
} else {
TypeName refname = getReferenceType();
if (refname != null) {
String qname = env.toQualifiedName(refname.toString());
reftype = env.lookupClass(qname);
}
}
ExpressionList args = getArguments();
OJClass[] argtypes = new OJClass[args.size()];
for (int i = 0; i < argtypes.length; ++i) {
argtypes[i] = args.get(i).getType(env);
}
OJMethod method = null;
if (reftype != null)
method = pickupMethod(reftype, name, argtypes);
if (method != null)
return method.getReturnType();
/* try to consult this class and outer classes */
if (reftype == null) {
OJClass declaring = selftype;
while (declaring != null) {
method = pickupMethod(declaring, name, argtypes);
if (method != null)
return method.getReturnType();
/* consult innerclasses */
OJClass[] inners = declaring.getDeclaredClasses();
for (int i = 0; i < inners.length; ++i) {
method = pickupMethod(inners[i], name, argtypes);
if (method != null)
return method.getReturnType();
}
declaring = declaring.getDeclaringClass();
}
reftype = selftype;
}
Signature sign = new Signature(name, argtypes);
NoSuchMemberException e = new NoSuchMemberException(sign.toString());
method = reftype.resolveException(e, name, argtypes);
return method.getReturnType();
}
private static OJMethod pickupMethod(
OJClass reftype,
String name,
OJClass[] argtypes) {
try {
return reftype.getAcceptableMethod(name, argtypes, reftype);
} catch (NoSuchMemberException e) {
return null;
}
}
}
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