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BSHClassDeclaration.java
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138 lines (117 loc) · 5.91 KB
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/*****************************************************************************
* 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. *
* *
* *
* This file is part of the BeanShell Java Scripting distribution. *
* Documentation and updates may be found at http://www.beanshell.org/ *
* Patrick Niemeyer ([email protected]) *
* Author of Learning Java, O'Reilly & Associates *
* *
*****************************************************************************/
package bsh;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import static bsh.ClassGenerator.Type;
/**
*/
class BSHClassDeclaration extends SimpleNode
{
/**
The class instance initializer method name.
A BshMethod by this name is installed by the class delcaration into
the static class body namespace.
It is called once to initialize the static members of the class space
and each time an instances is created to initialize the instance
members.
*/
static final String CLASSINITNAME = "_bshClassInit";
String name;
Modifiers modifiers = new Modifiers(Modifiers.CLASS);
int numInterfaces;
boolean extend;
Type type;
private Class<?> generatedClass;
BSHClassDeclaration(int id) { super(id); }
/**
*/
public synchronized Object eval(final CallStack callstack, final Interpreter interpreter ) throws EvalError {
if (generatedClass == null) {
generatedClass = generateClass(callstack, interpreter);
}
return generatedClass;
}
private Class<?> generateClass(final CallStack callstack, final Interpreter interpreter) throws EvalError {
int child = 0;
// resolve superclass if any
Class<?> superClass = null;
final List<BshMethod> meths = new ArrayList<>(0);
if ( extend ) {
BSHAmbiguousName superNode = (BSHAmbiguousName)jjtGetChild(child++);
superClass = superNode.toClass( callstack, interpreter );
// Validate if can extend this class
try {
Interpreter.mainSecurityGuard.canExtends(superClass);
} catch (UtilEvalError e) {
throw e.toEvalError(this, callstack);
}
if (Reflect.isGeneratedClass(superClass)) {
// Validate final classes should not be extended
if (Reflect.getClassModifiers(superClass).hasModifier("final"))
throw new EvalException("Cannot inherit from final class "
+ superClass.getName(), null, null);
// Collect final methods from all super class namespaces
meths.addAll(Stream.of(Reflect.getDeclaredMethods(superClass))
.filter(m->m.hasModifier("final")&&!m.hasModifier("private"))
.collect(Collectors.toList()));
}
}
// Get interfaces
Class<?>[] interfaces = new Class[numInterfaces];
for( int i=0; i<numInterfaces; i++) {
BSHAmbiguousName node = (BSHAmbiguousName)jjtGetChild(child++);
interfaces[i] = node.toClass(callstack, interpreter);
if ( !interfaces[i].isInterface() )
throw new EvalException(
"Type: "+node.text+" is not an interface!",
this, callstack );
// Validate if can implement this interface
try {
Interpreter.mainSecurityGuard.canImplements(interfaces[i]);
} catch (UtilEvalError e) {
throw e.toEvalError(this, callstack);
}
}
BSHBlock block = (BSHBlock) jjtGetChild(child);
if (type == Type.INTERFACE) // this should ideally happen in the parser
modifiers.changeContext(Modifiers.INTERFACE);
Class<?> clas = ClassGenerator.getClassGenerator().generateClass(
name, modifiers, interfaces, superClass, block, type,
callstack, interpreter );
// Validate final methods should not be overridden
for (BshMethod m : meths)
if (null != Reflect.getDeclaredMethod(clas, m.getName(), m.getParameterTypes()))
throw new EvalException("Cannot override "+m.getName()+"() in " +
StringUtil.typeString(superClass) + " overridden method is final", null, null);
return clas;
}
public String toString() {
return super.toString() + ": " + name;
}
}