/***
* ASM Guide
* Copyright (c) 2007 Eric Bruneton
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
package ch3.sec2;
import static org.objectweb.asm.Opcodes.ACC_PRIVATE;
import static org.objectweb.asm.Opcodes.ACC_PUBLIC;
import static org.objectweb.asm.Opcodes.V1_6;
import java.io.PrintWriter;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.FieldVisitor;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Type;
import org.objectweb.asm.commons.GeneratorAdapter;
import org.objectweb.asm.commons.Method;
import org.objectweb.asm.util.CheckClassAdapter;
import org.objectweb.asm.util.TraceClassVisitor;
/**
* ASM Guide example class.
*
* @author Eric Bruneton
*/
public class BeanGenerator2 {
public byte[] generate(PrintWriter printWriter) {
ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
TraceClassVisitor tcv = new TraceClassVisitor(cw, printWriter);
CheckClassAdapter cv = new CheckClassAdapter(tcv);
cv.visit(V1_6, ACC_PUBLIC, "pkg/Bean", null, "java/lang/Object",
null);
cv.visitSource("Bean.java", null);
FieldVisitor fv = cv.visitField(ACC_PRIVATE, "f", "I", null, null);
if (fv != null) {
fv.visitEnd();
}
MethodVisitor mv;
mv = cv.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
if (mv != null) {
Method m = Method.getMethod("void <init>()");
GeneratorAdapter ga = new GeneratorAdapter(ACC_PUBLIC, m, mv);
ga.visitCode();
ga.loadThis();
ga.invokeConstructor(Type.getType("Ljava/lang/Object;"), m);
ga.returnValue();
ga.endMethod();
}
mv = cv.visitMethod(ACC_PUBLIC, "getF", "()I", null, null);
if (mv != null) {
Type bean = Type.getType("Lpkg/Bean;");
Method m = Method.getMethod("int getF()");
GeneratorAdapter ga = new GeneratorAdapter(ACC_PUBLIC, m, mv);
ga.visitCode();
ga.loadThis();
ga.getField(bean, "f", Type.INT_TYPE);
ga.returnValue();
ga.endMethod();
}
mv = cv.visitMethod(ACC_PUBLIC, "setF", "(I)V", null, null);
if (mv != null) {
Type bean = Type.getType("Lpkg/Bean;");
Method m = Method.getMethod("void setF(int)");
GeneratorAdapter ga = new GeneratorAdapter(ACC_PUBLIC, m, mv);
ga.visitCode();
ga.loadThis();
ga.loadArg(0);
ga.putField(bean, "f", Type.INT_TYPE);
ga.returnValue();
ga.endMethod();
}
mv = cv.visitMethod(ACC_PUBLIC, "checkAndSetF", "(I)V", null, null);
if (mv != null) {
Type bean = Type.getType("Lpkg/Bean;");
Method m = Method.getMethod("void checkAndSetF(int)");
GeneratorAdapter ga = new GeneratorAdapter(ACC_PUBLIC, m, mv);
ga.visitCode();
ga.loadArg(0);
Label label = new Label();
ga.ifZCmp(GeneratorAdapter.LT, label);
ga.loadThis();
ga.loadArg(0);
ga.putField(bean, "f", Type.INT_TYPE);
Label end = new Label();
ga.goTo(end);
ga.mark(label);
ga.throwException(Type.getType(IllegalArgumentException.class),
"f");
ga.mark(end);
ga.returnValue();
ga.endMethod();
}
cv.visitEnd();
byte[] b = cw.toByteArray();
return b;
}
}