net.minidev.asm.ASMUtil Maven / Gradle / Ivy
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Java reflect give poor performance on getter setter an constructor calls, accessors-smart use ASM to speed up those calls.
package net.minidev.asm;
/*
* Copyright 2011 JSON-SMART 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.
*/
import static org.objectweb.asm.Opcodes.CHECKCAST;
import static org.objectweb.asm.Opcodes.INVOKESTATIC;
import static org.objectweb.asm.Opcodes.INVOKEVIRTUAL;
import java.lang.reflect.Field;
import java.util.HashMap;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Type;
/**
* ASM Utils used to simplify class generation
*
* @author uriel Chemouni
*/
public class ASMUtil {
/**
* Append the call of proper autoboxing method for the given primitive type.
*
* @param mv MethodVisitor
* @param clz expected class
*/
public static void autoBoxing(MethodVisitor mv, Class clz) {
autoBoxing(mv, Type.getType(clz));
}
/**
* Extract all Accessor for the field of the given class.
*
* @param type type
* @param filter FieldFilter
* @return all Accessor available
*/
static public Accessor[] getAccessors(Class type, FieldFilter filter) {
Class nextClass = type;
HashMap map = new HashMap();
if (filter == null)
filter = BasicFiledFilter.SINGLETON;
while (nextClass != Object.class) {
Field[] declaredFields = nextClass.getDeclaredFields();
for (Field field : declaredFields) {
String fn = field.getName();
if (map.containsKey(fn))
continue;
Accessor acc = new Accessor(nextClass, field, filter);
if (!acc.isUsable())
continue;
map.put(fn, acc);
}
nextClass = nextClass.getSuperclass();
}
return map.values().toArray(new Accessor[map.size()]);
}
/**
* Append the call of proper autoboxing method for the given primitive type.
*
* @param mv MethodVisitor
* @param fieldType expected class
*/
protected static void autoBoxing(MethodVisitor mv, Type fieldType) {
switch (fieldType.getSort()) {
case Type.BOOLEAN:
mv.visitMethodInsn(INVOKESTATIC, "java/lang/Boolean", "valueOf", "(Z)Ljava/lang/Boolean;", false);
break;
case Type.BYTE:
mv.visitMethodInsn(INVOKESTATIC, "java/lang/Byte", "valueOf", "(B)Ljava/lang/Byte;", false);
break;
case Type.CHAR:
mv.visitMethodInsn(INVOKESTATIC, "java/lang/Character", "valueOf", "(C)Ljava/lang/Character;", false);
break;
case Type.SHORT:
mv.visitMethodInsn(INVOKESTATIC, "java/lang/Short", "valueOf", "(S)Ljava/lang/Short;", false);
break;
case Type.INT:
mv.visitMethodInsn(INVOKESTATIC, "java/lang/Integer", "valueOf", "(I)Ljava/lang/Integer;", false);
break;
case Type.FLOAT:
mv.visitMethodInsn(INVOKESTATIC, "java/lang/Float", "valueOf", "(F)Ljava/lang/Float;", false);
break;
case Type.LONG:
mv.visitMethodInsn(INVOKESTATIC, "java/lang/Long", "valueOf", "(J)Ljava/lang/Long;", false);
break;
case Type.DOUBLE:
mv.visitMethodInsn(INVOKESTATIC, "java/lang/Double", "valueOf", "(D)Ljava/lang/Double;", false);
break;
}
}
/**
* Append the call of proper extract primitive type of an boxed object.
*
* @param mv MethodVisitor
* @param fieldType expected class
*/
protected static void autoUnBoxing1(MethodVisitor mv, Type fieldType) {
switch (fieldType.getSort()) {
case Type.BOOLEAN:
mv.visitTypeInsn(CHECKCAST, "java/lang/Boolean");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Boolean", "booleanValue", "()Z", false);
break;
case Type.BYTE:
mv.visitTypeInsn(CHECKCAST, "java/lang/Byte");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Byte", "byteValue", "()B", false);
break;
case Type.CHAR:
mv.visitTypeInsn(CHECKCAST, "java/lang/Character");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Character", "charValue", "()C", false);
break;
case Type.SHORT:
mv.visitTypeInsn(CHECKCAST, "java/lang/Short");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Short", "shortValue", "()S", false);
break;
case Type.INT:
mv.visitTypeInsn(CHECKCAST, "java/lang/Integer");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Integer", "intValue", "()I", false);
break;
case Type.FLOAT:
mv.visitTypeInsn(CHECKCAST, "java/lang/Float");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Float", "floatValue", "()F", false);
break;
case Type.LONG:
mv.visitTypeInsn(CHECKCAST, "java/lang/Long");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Long", "longValue", "()J", false);
break;
case Type.DOUBLE:
mv.visitTypeInsn(CHECKCAST, "java/lang/Double");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Double", "doubleValue", "()D", false);
break;
case Type.ARRAY:
mv.visitTypeInsn(CHECKCAST, fieldType.getInternalName());
break;
default:
mv.visitTypeInsn(CHECKCAST, fieldType.getInternalName());
}
}
/**
* Append the call of proper extract primitive type of an boxed object. this
* method use Number interface to unbox object
*
* @param mv MethodVisitor
* @param fieldType expected class
*/
protected static void autoUnBoxing2(MethodVisitor mv, Type fieldType) {
switch (fieldType.getSort()) {
case Type.BOOLEAN:
mv.visitTypeInsn(CHECKCAST, "java/lang/Boolean");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Boolean", "booleanValue", "()Z", false);
break;
case Type.BYTE:
mv.visitTypeInsn(CHECKCAST, "java/lang/Number");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Number", "byteValue", "()B", false);
break;
case Type.CHAR:
mv.visitTypeInsn(CHECKCAST, "java/lang/Character");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Character", "charValue", "()C", false);
break;
case Type.SHORT:
mv.visitTypeInsn(CHECKCAST, "java/lang/Number");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Number", "shortValue", "()S", false);
break;
case Type.INT:
mv.visitTypeInsn(CHECKCAST, "java/lang/Number");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Number", "intValue", "()I", false);
break;
case Type.FLOAT:
mv.visitTypeInsn(CHECKCAST, "java/lang/Number");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Number", "floatValue", "()F", false);
break;
case Type.LONG:
mv.visitTypeInsn(CHECKCAST, "java/lang/Number");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Number", "longValue", "()J", false);
break;
case Type.DOUBLE:
mv.visitTypeInsn(CHECKCAST, "java/lang/Number");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Number", "doubleValue", "()D", false);
break;
case Type.ARRAY:
mv.visitTypeInsn(CHECKCAST, fieldType.getInternalName());
break;
default:
mv.visitTypeInsn(CHECKCAST, fieldType.getInternalName());
}
}
/**
* return a array of new Label (used for switch/case generation)
*
* @param cnt number of label to return
* @return a Label array
*/
public static Label[] newLabels(int cnt) {
Label[] r = new Label[cnt];
for (int i = 0; i < cnt; i++)
r[i] = new Label();
return r;
}
/**
* @param key the field name
* @return setter name
*/
public static String getSetterName(String key) {
int len = key.length();
char[] b = new char[len + 3];
b[0] = 's';
b[1] = 'e';
b[2] = 't';
char c = key.charAt(0);
if (c >= 'a' && c <= 'z')
c += 'A' - 'a';
b[3] = c;
for (int i = 1; i < len; i++) {
b[i + 3] = key.charAt(i);
}
return new String(b);
}
/**
* @param key the field name
* @return getter name
*/
public static String getGetterName(String key) {
int len = key.length();
char[] b = new char[len + 3];
b[0] = 'g';
b[1] = 'e';
b[2] = 't';
char c = key.charAt(0);
if (c >= 'a' && c <= 'z')
c += 'A' - 'a';
b[3] = c;
for (int i = 1; i < len; i++) {
b[i + 3] = key.charAt(i);
}
return new String(b);
}
/**
* @param key the boolean field name
* @return boolean getter name
*/
public static String getIsName(String key) {
int len = key.length();
char[] b = new char[len + 2];
b[0] = 'i';
b[1] = 's';
char c = key.charAt(0);
if (c >= 'a' && c <= 'z')
c += 'A' - 'a';
b[2] = c;
for (int i = 1; i < len; i++) {
b[i + 2] = key.charAt(i);
}
return new String(b);
}
}
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