/
ClassFileBuilder.java
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/
ClassFileBuilder.java
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package org.isk.jvmhardcore.pjba.builder;
import org.isk.jvmhardcore.pjba.structure.ClassFile;
import org.isk.jvmhardcore.pjba.structure.Field;
import org.isk.jvmhardcore.pjba.structure.Interface;
import org.isk.jvmhardcore.pjba.structure.Method;
import org.isk.jvmhardcore.pjba.structure.attribute.ConstantValue;
import org.isk.jvmhardcore.pjba.util.DescriptorCounter;
public class ClassFileBuilder {
private ClassFile classFile;
private MethodBuilder methodBuilder;
public ClassFileBuilder(int classModifiers, final String fullyQualifiedName, final String fullyQualifiedParentName) {
super();
if ((classModifiers & ClassFile.MODIFIER_INTERFACE) != ClassFile.MODIFIER_INTERFACE) {
classModifiers |= ClassFile.MODIFIER_SUPER;
}
this.classFile = new ClassFile(fullyQualifiedName);
this.classFile.addAccessFlags(classModifiers);
final int parentUtf8Index = this.classFile.addConstantUTF8(fullyQualifiedParentName);
final int parentClassIndex = this.classFile.addConstantClass(parentUtf8Index);
this.classFile.setSuperClass(parentClassIndex);
}
public ClassFileBuilder(final int classModifiers, final String fullyQualifiedName) {
this(classModifiers, fullyQualifiedName, "java/lang/Object");
}
public ClassFileBuilder newInterface(final String fullyQualifiedInterfaceName) {
final int interfaceUtf8Index = this.classFile.addConstantUTF8(fullyQualifiedInterfaceName);
final int interfaceClassIndex = this.classFile.addConstantClass(interfaceUtf8Index);
this.classFile.addInterface(new Interface(interfaceClassIndex));
return this;
}
public ClassFileBuilder newField(final int fieldModifiers, final String fieldName, final String fieldDescriptor) {
this.createNewField(fieldModifiers, fieldName, fieldDescriptor);
return this;
}
public ClassFileBuilder newConstantField(final int fieldModifiers,
final String fieldName,
final String fieldDescriptor,
final int value) {
final int constantIntegerIndex = this.classFile.addConstantInteger(value);
final ConstantValue constantValue = this.createConstantValue(constantIntegerIndex);
final Field field = this.createNewField(fieldModifiers | Field.MODIFIER_FINAL, fieldName, fieldDescriptor);
field.addAttibute(constantValue);
return this;
}
public ClassFileBuilder newConstantField(final int fieldModifiers,
final String fieldName,
final String fieldDescriptor,
final long value) {
final int constantIntegerIndex = this.classFile.addConstantLong(value);
final ConstantValue constantValue = this.createConstantValue(constantIntegerIndex);
final Field field = this.createNewField(fieldModifiers | Field.MODIFIER_FINAL, fieldName, fieldDescriptor);
field.addAttibute(constantValue);
return this;
}
public ClassFileBuilder newConstantField(final int fieldModifiers,
final String fieldName,
final String fieldDescriptor,
final float value) {
final int constantIntegerIndex = this.classFile.addConstantFloat(value);
final ConstantValue constantValue = this.createConstantValue(constantIntegerIndex);
final Field field = this.createNewField(fieldModifiers | Field.MODIFIER_FINAL, fieldName, fieldDescriptor);
field.addAttibute(constantValue);
return this;
}
public ClassFileBuilder newConstantField(final int fieldModifiers,
final String fieldName,
final String fieldDescriptor,
final double value) {
final int constantIntegerIndex = this.classFile.addConstantDouble(value);
final ConstantValue constantValue = this.createConstantValue(constantIntegerIndex);
final Field field = this.createNewField(fieldModifiers | Field.MODIFIER_FINAL, fieldName, fieldDescriptor);
field.addAttibute(constantValue);
return this;
}
public ClassFileBuilder newConstantField(final int fieldModifiers,
final String fieldName,
final String fieldDescriptor,
final String value) {
final int valueUtf8Index = this.classFile.addConstantUTF8(value);
final int constantIntegerIndex = this.classFile.addConstantString(valueUtf8Index);
final ConstantValue constantValue = this.createConstantValue(constantIntegerIndex);
final Field field = this.createNewField(fieldModifiers | Field.MODIFIER_FINAL, fieldName, fieldDescriptor);
field.addAttibute(constantValue);
return this;
}
private Field createNewField(final int fieldModifiers, final String fieldName, final String fieldDescriptor) {
final int nameIndex = this.classFile.addConstantUTF8(fieldName);
final int descriptorIndex = this.classFile.addConstantUTF8(fieldDescriptor);
final Field field = new Field();
field.setNameIndex(nameIndex);
field.setDescriptorIndex(descriptorIndex);
field.setAccessFlags(fieldModifiers);
this.classFile.addField(field);
return field;
}
private ConstantValue createConstantValue(final int constantIndex) {
final int constantValueAttributeIndex = this.classFile.addConstantUTF8(ConstantValue.ATTRIBUTE_NAME);
final ConstantValue constantValue = new ConstantValue(constantValueAttributeIndex);
constantValue.setConstantValueIndex(constantIndex);
return constantValue;
}
public MethodBuilder newConstructor(final int methodModifiers, final String methodDescriptor) {
return this.newConstructor(methodModifiers, methodDescriptor, true);
}
public MethodBuilder newConstructor(final int methodModifiers,
final String methodDescriptor,
final boolean eagerConstruction) {
return this.newMethod(methodModifiers, "<init>", methodDescriptor, eagerConstruction);
}
public MethodBuilder newMethod(final int methodModifiers,
final String methodName,
final String methodDescriptor,
final boolean eagerConstruction) {
if (this.methodBuilder != null) {
this.methodBuilder.buildMethod();
}
final int methodIndex = this.classFile.addConstantUTF8(methodName);
final int descriptorIndex = this.classFile.addConstantUTF8(methodDescriptor);
final Method method = new Method();
method.setNameIndex(methodIndex);
method.setDescriptorIndex(descriptorIndex);
method.setAccessFlags(methodModifiers);
this.classFile.addMethod(method);
int locals = DescriptorCounter.methodsDescriptorParamsUnits(methodDescriptor);
// Count this
if ((Method.MODIFIER_STATIC & methodModifiers) != Method.MODIFIER_STATIC) {
locals++;
}
this.methodBuilder = new MethodBuilder(this, method, locals, eagerConstruction);
return method.accessFlagSet(Method.MODIFIER_ABSTRACT) ? null : this.methodBuilder;
}
public MethodBuilder newMethod(final int methodModifiers, final String methodName, final String methodDescriptor) {
return this.newMethod(methodModifiers, methodName, methodDescriptor, true);
}
public ClassFileBuilder newAbstractMethod(final int methodModifiers,
final String methodName,
final String methodDescriptor) {
this.newMethod(methodModifiers | Method.MODIFIER_ABSTRACT, methodName, methodDescriptor, true);
return this;
}
public MethodBuilder staticBlock(boolean eagerConstruction) {
return this.newMethod(Method.MODIFIER_STATIC, "<clinit>", "()V", eagerConstruction);
}
public MethodBuilder staticBlock() {
return this.staticBlock(true);
}
public ClassFile build() {
if (this.methodBuilder != null) {
this.methodBuilder.buildMethod();
}
return this.classFile;
}
protected ClassFile getClassFile() {
return this.classFile;
}
}