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Groovy: A powerful, dynamic language for the JVM
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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;
import org.codehaus.groovy.ast.stmt.BlockStatement;
import org.codehaus.groovy.ast.stmt.Statement;
import org.objectweb.asm.Opcodes;
import java.util.List;
/**
* Represents a method declaration
*
* @author James Strachan
* @author Hamlet D'Arcy
*/
public class MethodNode extends AnnotatedNode implements Opcodes {
public static final String SCRIPT_BODY_METHOD_KEY = "org.codehaus.groovy.ast.MethodNode.isScriptBody";
private final String name;
private int modifiers;
private boolean syntheticPublic;
private ClassNode returnType;
private Parameter[] parameters;
private boolean hasDefaultValue = false;
private Statement code;
private boolean dynamicReturnType;
private VariableScope variableScope;
private final ClassNode[] exceptions;
private final boolean staticConstructor;
// type spec for generics
private GenericsType[] genericsTypes = null;
private boolean hasDefault;
// cached data
String typeDescriptor;
public MethodNode(String name, int modifiers, ClassNode returnType, Parameter[] parameters, ClassNode[] exceptions, Statement code) {
this.name = name;
this.modifiers = modifiers;
this.code = code;
setReturnType(returnType);
VariableScope scope = new VariableScope();
setVariableScope(scope);
setParameters(parameters);
this.hasDefault = false;
this.exceptions = exceptions;
this.staticConstructor = (name != null && name.equals(""));
}
/**
* The type descriptor for a method node is a string containing the name of the method, its return type,
* and its parameter types in a canonical form. For simplicity, I'm using the format of a Java declaration
* without parameter names.
*
* @return the type descriptor
*/
public String getTypeDescriptor() {
if (typeDescriptor == null) {
StringBuilder buf = new StringBuilder(name.length() + parameters.length * 10);
buf.append(returnType.getName());
buf.append(' ');
buf.append(name);
buf.append('(');
for (int i = 0; i < parameters.length; i++) {
if (i > 0) {
buf.append(", ");
}
Parameter param = parameters[i];
buf.append(formatTypeName(param.getType()));
}
buf.append(')');
typeDescriptor = buf.toString();
}
return typeDescriptor;
}
/**
* Formats a type name in a readable version. For arrays, appends "[]" to the formatted
* type name of the component. For unit class nodes, uses the class node name.
* @param type the type to format
* @return a human readable version of the type name (java.lang.String[] for example)
*/
private static String formatTypeName(ClassNode type) {
if (type.isArray()) {
ClassNode it = type;
int dim = 0;
while (it.isArray()) {
dim++;
it = it.getComponentType();
}
StringBuilder sb = new StringBuilder(it.getName().length()+2*dim);
sb.append(it.getName());
for (int i=0;i 0) {
for (Parameter para : parameters) {
if (para.hasInitialExpression()) {
this.hasDefaultValue = true;
}
para.setInStaticContext(isStatic());
scope.putDeclaredVariable(para);
}
}
setVariableScope(scope);
}
public ClassNode getReturnType() {
return returnType;
}
public VariableScope getVariableScope() {
return variableScope;
}
public void setVariableScope(VariableScope variableScope) {
this.variableScope = variableScope;
variableScope.setInStaticContext(isStatic());
}
public boolean isDynamicReturnType() {
return dynamicReturnType;
}
public boolean isAbstract() {
return (modifiers & ACC_ABSTRACT) != 0;
}
public boolean isStatic() {
return (modifiers & ACC_STATIC) != 0;
}
public boolean isPublic() {
return (modifiers & ACC_PUBLIC) != 0;
}
public boolean isPrivate() {
return (modifiers & ACC_PRIVATE) != 0;
}
public boolean isFinal() {
return (modifiers & ACC_FINAL) != 0;
}
public boolean isProtected() {
return (modifiers & ACC_PROTECTED) != 0;
}
public boolean hasDefaultValue() {
return this.hasDefaultValue;
}
/**
* @return true if this method is the run method from a script
*/
public boolean isScriptBody() {
return getNodeMetaData(SCRIPT_BODY_METHOD_KEY) != null;
}
/**
* Set the metadata flag for this method to indicate that it is a script body implementation.
* @see ModuleNode createStatementsClass().
*/
public void setIsScriptBody() {
setNodeMetaData(SCRIPT_BODY_METHOD_KEY, true);
}
public String toString() {
return "MethodNode@" + hashCode() + "[" + getTypeDescriptor() + "]";
}
public void setReturnType(ClassNode returnType) {
invalidateCachedData();
dynamicReturnType |= ClassHelper.DYNAMIC_TYPE == returnType;
this.returnType = returnType;
if (returnType == null) this.returnType = ClassHelper.OBJECT_TYPE;
}
public ClassNode[] getExceptions() {
return exceptions;
}
public Statement getFirstStatement() {
if (code == null) return null;
Statement first = code;
while (first instanceof BlockStatement) {
List list = ((BlockStatement) first).getStatements();
if (list.isEmpty()) {
first = null;
} else {
first = list.get(0);
}
}
return first;
}
public GenericsType[] getGenericsTypes() {
return genericsTypes;
}
public void setGenericsTypes(GenericsType[] genericsTypes) {
invalidateCachedData();
this.genericsTypes = genericsTypes;
}
public void setAnnotationDefault(boolean b) {
this.hasDefault = b;
}
public boolean hasAnnotationDefault() {
return hasDefault;
}
public boolean isStaticConstructor() {
return staticConstructor;
}
/**
* Indicates that this method has been "promoted" to public by
* Groovy when in fact there was no public modifier explicitly
* in the source code. I.e. it remembers that it has applied
* Groovy's "public methods by default" rule. This property is
* typically only of interest to AST transform writers.
*
* @return true if this class is public but had no explicit public modifier
*/
public boolean isSyntheticPublic() {
return syntheticPublic;
}
public void setSyntheticPublic(boolean syntheticPublic) {
this.syntheticPublic = syntheticPublic;
}
/**
* Provides a nicely formatted string of the method definition. For simplicity, generic types on some of the elements
* are not displayed.
* @return
* string form of node with some generic elements suppressed
*/
@Override
public String getText() {
String retType = AstToTextHelper.getClassText(returnType);
String exceptionTypes = AstToTextHelper.getThrowsClauseText(exceptions);
String parms = AstToTextHelper.getParametersText(parameters);
return AstToTextHelper.getModifiersText(modifiers) + " " + retType + " " + name + "(" + parms + ") " + exceptionTypes + " { ... }";
}
}