Java Code Examples for org.apache.bcel.classfile.ConstantPool#getConstantString()

/**
 * Returns true if given constant pool probably has a reference to any of supplied methods
 * Useful to exclude from analysis uninteresting classes
 * @param cp constant pool
 * @param methods methods collection
 * @return true if method is found
 */
public static boolean hasInterestingMethod(ConstantPool cp, Collection<MethodDescriptor> methods) {
    for (Constant c : cp.getConstantPool()) {
        if (c instanceof ConstantMethodref || c instanceof ConstantInterfaceMethodref) {
            ConstantCP desc = (ConstantCP) c;
            ConstantNameAndType nameAndType = (ConstantNameAndType) cp.getConstant(desc.getNameAndTypeIndex());
            String className = cp.getConstantString(desc.getClassIndex(), Const.CONSTANT_Class);
            String name = ((ConstantUtf8) cp.getConstant(nameAndType.getNameIndex())).getBytes();
            String signature = ((ConstantUtf8) cp.getConstant(nameAndType.getSignatureIndex())).getBytes();
            // We don't know whether method is static thus cannot use equals
            int hash = FieldOrMethodDescriptor.getNameSigHashCode(name, signature);
            for (MethodDescriptor method : methods) {
                if (method.getNameSigHashCode() == hash
                        && (method.getSlashedClassName().isEmpty() || method.getSlashedClassName().equals(className))
                        && method.getName().equals(name) && method.getSignature().equals(signature)) {
                    return true;
                }
            }
        }
    }
    return false;
}
 

static ImmutableSet<String> listInnerClassNames(JavaClass javaClass) {
  ImmutableSet.Builder<String> innerClassNames = ImmutableSet.builder();
  String topLevelClassName = javaClass.getClassName();
  ConstantPool constantPool = javaClass.getConstantPool();
  for (Attribute attribute : javaClass.getAttributes()) {
    if (attribute.getTag() == Const.ATTR_INNER_CLASSES) {
      // This innerClasses variable does not include double-nested inner classes
      InnerClasses innerClasses = (InnerClasses) attribute;
      for (InnerClass innerClass : innerClasses.getInnerClasses()) {
        int classIndex = innerClass.getInnerClassIndex();
        String innerClassName = constantPool.getConstantString(classIndex, Const.CONSTANT_Class);
        int outerClassIndex = innerClass.getOuterClassIndex();
        if (outerClassIndex > 0) {
          String outerClassName =
              constantPool.getConstantString(outerClassIndex, Const.CONSTANT_Class);
          String normalOuterClassName = outerClassName.replace('/', '.');
          if (!normalOuterClassName.equals(topLevelClassName)) {
            continue;
          }
        }

        // Class names stored in constant pool have '/' as separator. We want '.' (as binary name)
        String normalInnerClassName = innerClassName.replace('/', '.');
        innerClassNames.add(normalInnerClassName);
      }
    }
  }
  return innerClassNames.build();
}
 

/**
 * This overrides the deprecated version as we know here that the referenced class
 * may legally be an array.
 *
 * @return name of the referenced class/interface
 * @throws IllegalArgumentException if the referenced class is an array (this should not happen)
 */
@Override
public String getClassName( final ConstantPoolGen cpg ) {
    final ConstantPool cp = cpg.getConstantPool();
    final ConstantCP cmr = (ConstantCP) cp.getConstant(super.getIndex());
    final String className = cp.getConstantString(cmr.getClassIndex(), Const.CONSTANT_Class);
    return className.replace('/', '.');
}
 

/**
 * @return name of the referenced class/interface
 * @deprecated If the instruction references an array class,
 *    this method will return "java.lang.Object".
 *    For code generated by Java 1.5, this answer is
 *    sometimes wrong (e.g., if the "clone()" method is
 *    called on an array).  A better idea is to use
 *    the {@link #getReferenceType(ConstantPoolGen)} method, which correctly distinguishes
 *    between class types and array types.
 *
 */
@Deprecated
public String getClassName(final ConstantPoolGen cpg) {
    final ConstantPool cp = cpg.getConstantPool();
    final ConstantCP cmr = (ConstantCP) cp.getConstant(super.getIndex());
    final String className = cp.getConstantString(cmr.getClassIndex(), Const.CONSTANT_Class);
    if (className.startsWith("[")) {
        // Turn array classes into java.lang.Object.
        return "java.lang.Object";
    }
    return className.replace('/', '.');
}
 

/**
 * Gets the reference type representing the class, interface,
 * or array class referenced by the instruction.
 * @param cpg the ConstantPoolGen used to create the instruction
 * @return an ObjectType (if the referenced class type is a class
 *   or interface), or an ArrayType (if the referenced class
 *   type is an array class)
 */
public ReferenceType getReferenceType(final ConstantPoolGen cpg) {
    final ConstantPool cp = cpg.getConstantPool();
    final ConstantCP cmr = (ConstantCP) cp.getConstant(super.getIndex());
    String className = cp.getConstantString(cmr.getClassIndex(), Const.CONSTANT_Class);
    if (className.startsWith("[")) {
        return (ArrayType) Type.getType(className);
    }
    className = className.replace('/', '.');
    return ObjectType.getInstance(className);
}
 

/** @return type related with this instruction.
 */
@Override
public Type getType( final ConstantPoolGen cpg ) {
    final ConstantPool cp = cpg.getConstantPool();
    String name = cp.getConstantString(index, org.apache.bcel.Const.CONSTANT_Class);
    if (!name.startsWith("[")) {
        name = "L" + name + ";";
    }
    return Type.getType(name);
}