/*******************************************************************************
* Copyright (c) 2011 Luaj.org. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
******************************************************************************/
package org.luaj.vm2.lib.jse;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import org.luaj.vm2.LuaValue;
/**
* LuaValue that represents a Java class.
* <p>
* Will respond to get() and set() by returning field values, or java methods.
* <p>
* This class is not used directly.
* It is returned by calls to {@link CoerceJavaToLua#coerce(Object)}
* when a Class is supplied.
* @see CoerceJavaToLua
* @see CoerceLuaToJava
*/
public class JavaClass extends JavaInstance implements CoerceJavaToLua.Coercion {
static final Map classes = Collections.synchronizedMap(new HashMap());
static final LuaValue NEW = valueOf("new");
Map fields;
Map methods;
public static JavaClass forClass(Class c) {
JavaClass j = (JavaClass) classes.get(c);
if ( j == null )
classes.put( c, j = new JavaClass(c) );
return j;
}
JavaClass(Class c) {
super(c);
this.jclass = this;
}
public LuaValue coerce(Object javaValue) {
return this;
}
Field getField(LuaValue key) {
if ( fields == null ) {
Map m = new HashMap();
Field[] f = ((Class)m_instance).getFields();
for ( int i=0; i<f.length; i++ ) {
Field fi = f[i];
if ( Modifier.isPublic(fi.getModifiers()) ) {
m.put( LuaValue.valueOf(fi.getName()), fi );
try {
if (!fi.isAccessible())
fi.setAccessible(true);
} catch (SecurityException s) {
}
}
}
fields = m;
}
return (Field) fields.get(key);
}
LuaValue getMethod(LuaValue key) {
if ( methods == null ) {
Map namedlists = new HashMap();
Method[] m = ((Class)m_instance).getMethods();
for ( int i=0; i<m.length; i++ ) {
Method mi = m[i];
if ( Modifier.isPublic( mi.getModifiers()) ) {
String name = mi.getName();
List list = (List) namedlists.get(name);
if ( list == null ) {
namedlists.put(name, list = new ArrayList());
}
JavaMethod method = JavaMethod.forMethod(mi);
if(method != null) {//FIXME by song, 做保护
list.add(method);
}
}
}
Map map = new HashMap();
Constructor[] c = ((Class)m_instance).getConstructors();
List list = new ArrayList();
for ( int i=0; i<c.length; i++ )
if ( Modifier.isPublic(c[i].getModifiers()) )
list.add( JavaConstructor.forConstructor(c[i]) );
switch ( list.size() ) {
case 0: break;
case 1: map.put(NEW, list.get(0)); break;
default: map.put(NEW, JavaConstructor.forConstructors( (JavaConstructor[])list.toArray(new JavaConstructor[list.size()]) ) ); break;
}
for ( Iterator it=namedlists.entrySet().iterator(); it.hasNext(); ) {
Entry e = (Entry) it.next();
String name = (String) e.getKey();
List methods = (List) e.getValue();
map.put( LuaValue.valueOf(name),
methods.size()==1?
methods.get(0):
JavaMethod.forMethods( (JavaMethod[])methods.toArray(new JavaMethod[methods.size()])) );
}
methods = map;
}
return (LuaValue) methods.get(key);
}
public LuaValue getConstructor() {
return getMethod(NEW);
}
}