/*
* Copyright 2003-2007 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.codehaus.groovy.ast.expr;
import org.codehaus.groovy.ast.ASTNode;
import org.codehaus.groovy.ast.ClassHelper;
import org.codehaus.groovy.ast.GenericsType;
import org.codehaus.groovy.ast.GroovyCodeVisitor;
import org.codehaus.groovy.ast.MethodNode;
/**
* A method call on an object or class
*
* @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
* @version $Revision$
*/
public class MethodCallExpression extends Expression {
private Expression objectExpression;
private Expression method;
private Expression arguments;
private boolean spreadSafe = false;
private boolean safe = false;
private boolean implicitThis;
// type spec for generics
private GenericsType[] genericsTypes = null;
private boolean usesGenerics = false;
private MethodNode target;
public static final Expression NO_ARGUMENTS = new TupleExpression();
public MethodCallExpression(Expression objectExpression, String method, Expression arguments) {
this(objectExpression,new ConstantExpression(method),arguments);
}
public MethodCallExpression(Expression objectExpression, Expression method, Expression arguments) {
this.objectExpression = objectExpression;
this.method = method;
if (!(arguments instanceof TupleExpression)){
this.arguments = new TupleExpression(arguments);
} else {
this.arguments = arguments;
}
//TODO: set correct type here
// if setting type and a methodcall is the last expression in a method,
// then the method will return null if the method itself is not void too!
// (in bytecode after call: aconst_null, areturn)
this.setType(ClassHelper.DYNAMIC_TYPE);
this.setImplicitThis(true);
}
public void visit(GroovyCodeVisitor visitor) {
visitor.visitMethodCallExpression(this);
}
public Expression transformExpression(ExpressionTransformer transformer) {
MethodCallExpression answer =
new MethodCallExpression(transformer.transform(objectExpression), transformer.transform(method), transformer.transform(arguments));
answer.setSafe(safe);
answer.setSpreadSafe(spreadSafe);
answer.setImplicitThis(implicitThis);
// GRECLIPSE add
answer.setGenericsTypes(genericsTypes);
// GRECLIPSE end
answer.setMethodTarget(target);
answer.setSourcePosition(this);
answer.copyNodeMetaData(this);
return answer;
}
public Expression getArguments() {
return arguments;
}
public void setArguments(Expression arguments) {
if (!(arguments instanceof TupleExpression)){
this.arguments = new TupleExpression(arguments);
} else {
this.arguments = arguments;
}
}
public Expression getMethod() {
return method;
}
public void setMethod(Expression method) {
this.method = method;
}
/**
* This method returns the method name as String if it is no dynamic
* calculated method name, but a constant.
*/
public String getMethodAsString() {
if (! (method instanceof ConstantExpression)) return null;
ConstantExpression constant = (ConstantExpression) method;
return constant.getText();
}
public void setObjectExpression(Expression objectExpression) {
this.objectExpression = objectExpression;
}
public Expression getObjectExpression() {
return objectExpression;
}
public String getText() {
String object = objectExpression.getText();
String meth = method.getText();
String args = arguments.getText();
String spread = spreadSafe ? "*" : "";
String dereference = safe ? "?" : "";
return object + spread + dereference + "." + meth + args;
}
/**
* @return is this a safe method call, i.e. if true then if the source object is null
* then this method call will return null rather than throwing a null pointer exception
*/
public boolean isSafe() {
return safe;
}
public void setSafe(boolean safe) {
this.safe = safe;
}
public boolean isSpreadSafe() {
return spreadSafe;
}
public void setSpreadSafe(boolean value) {
spreadSafe = value;
}
/**
* @return true if no object expression was specified otherwise if
* some expression was specified for the object on which to evaluate
* the method then return false
*/
public boolean isImplicitThis() {
return implicitThis;
}
public void setImplicitThis(boolean implicitThis) {
this.implicitThis = implicitThis;
}
public String toString() {
return super.toString()
+ "[object: "
+ objectExpression
+ " method: "
+ method
+ " arguments: "
+ arguments
+ "]";
}
public GenericsType[] getGenericsTypes() {
return genericsTypes;
}
public void setGenericsTypes(GenericsType[] genericsTypes) {
usesGenerics = usesGenerics || genericsTypes != null;
this.genericsTypes = genericsTypes;
}
public boolean isUsingGenerics() {
return usesGenerics;
}
/**
* Sets a method call target for a direct method call.
* WARNING: A method call made this way will run outside of the MOP!
* @param mn the target as MethodNode, mn==null means no target
*/
public void setMethodTarget(MethodNode mn) {
this.target = mn;
if (mn!=null) {
setType(target.getReturnType());
} else {
setType(ClassHelper.OBJECT_TYPE);
}
}
/**
* @return the target as method node if set
*/
public MethodNode getMethodTarget() {
return target;
}
// GRECLIPSE add -- GROOVY-8002
public void setSourcePosition(ASTNode node) {
super.setSourcePosition(node);
if (node instanceof MethodCallExpression) {
method.setSourcePosition(((MethodCallExpression) node).getMethod());
if (arguments != null) {
arguments.setSourcePosition(((MethodCallExpression) node).getArguments());
}
} else if (node instanceof StaticMethodCallExpression) {
method.setSourcePosition(node);
method.setEnd(method.getStart() + getMethodAsString().length());
if (arguments != null) {
arguments.setSourcePosition(((StaticMethodCallExpression) node).getArguments());
}
}
}
// GRECLIPSE end
}