Java Code Examples for org.apache.bcel.Const#CONSTANT_Module
The following examples show how to use
org.apache.bcel.Const#CONSTANT_Module .
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Example 1
| Source File: ConstantPool.java From commons-bcel with Apache License 2.0 | 5 votes |
|
/**
* Gets string from constant pool and bypass the indirection of
* `ConstantClass' and `ConstantString' objects. I.e. these classes have
* an index field that points to another entry of the constant pool of
* type `ConstantUtf8' which contains the real data.
*
* @param index Index in constant pool
* @param tag Tag of expected constant, either ConstantClass or ConstantString
* @return Contents of string reference
* @see ConstantClass
* @see ConstantString
* @throws ClassFormatException
*/
public String getConstantString( final int index, final byte tag ) throws ClassFormatException {
Constant c;
int i;
c = getConstant(index, tag);
/* This switch() is not that elegant, since the four classes have the
* same contents, they just differ in the name of the index
* field variable.
* But we want to stick to the JVM naming conventions closely though
* we could have solved these more elegantly by using the same
* variable name or by subclassing.
*/
switch (tag) {
case Const.CONSTANT_Class:
i = ((ConstantClass) c).getNameIndex();
break;
case Const.CONSTANT_String:
i = ((ConstantString) c).getStringIndex();
break;
case Const.CONSTANT_Module:
i = ((ConstantModule) c).getNameIndex();
break;
case Const.CONSTANT_Package:
i = ((ConstantPackage) c).getNameIndex();
break;
default:
throw new IllegalArgumentException("getConstantString called with illegal tag " + tag);
}
// Finally get the string from the constant pool
c = getConstant(i, Const.CONSTANT_Utf8);
return ((ConstantUtf8) c).getBytes();
}
Example 2
| Source File: ConstantModule.java From commons-bcel with Apache License 2.0 | 4 votes |
|
/**
* @param nameIndex Name index in constant pool. Should refer to a
* ConstantUtf8.
*/
public ConstantModule(final int nameIndex) {
super(Const.CONSTANT_Module);
this.nameIndex = nameIndex;
}
Example 3
| Source File: ConstantPool.java From commons-bcel with Apache License 2.0 | 4 votes |
|
/**
* Resolves constant to a string representation.
*
* @param c Constant to be printed
* @return String representation
*/
public String constantToString( Constant c ) throws ClassFormatException {
String str;
int i;
final byte tag = c.getTag();
switch (tag) {
case Const.CONSTANT_Class:
i = ((ConstantClass) c).getNameIndex();
c = getConstant(i, Const.CONSTANT_Utf8);
str = Utility.compactClassName(((ConstantUtf8) c).getBytes(), false);
break;
case Const.CONSTANT_String:
i = ((ConstantString) c).getStringIndex();
c = getConstant(i, Const.CONSTANT_Utf8);
str = "\"" + escape(((ConstantUtf8) c).getBytes()) + "\"";
break;
case Const.CONSTANT_Utf8:
str = ((ConstantUtf8) c).getBytes();
break;
case Const.CONSTANT_Double:
str = String.valueOf(((ConstantDouble) c).getBytes());
break;
case Const.CONSTANT_Float:
str = String.valueOf(((ConstantFloat) c).getBytes());
break;
case Const.CONSTANT_Long:
str = String.valueOf(((ConstantLong) c).getBytes());
break;
case Const.CONSTANT_Integer:
str = String.valueOf(((ConstantInteger) c).getBytes());
break;
case Const.CONSTANT_NameAndType:
str = constantToString(((ConstantNameAndType) c).getNameIndex(),
Const.CONSTANT_Utf8)
+ " " + constantToString(((ConstantNameAndType) c).getSignatureIndex(),
Const.CONSTANT_Utf8);
break;
case Const.CONSTANT_InterfaceMethodref:
case Const.CONSTANT_Methodref:
case Const.CONSTANT_Fieldref:
str = constantToString(((ConstantCP) c).getClassIndex(), Const.CONSTANT_Class)
+ "." + constantToString(((ConstantCP) c).getNameAndTypeIndex(),
Const.CONSTANT_NameAndType);
break;
case Const.CONSTANT_MethodHandle:
// Note that the ReferenceIndex may point to a Fieldref, Methodref or
// InterfaceMethodref - so we need to peek ahead to get the actual type.
final ConstantMethodHandle cmh = (ConstantMethodHandle) c;
str = Const.getMethodHandleName(cmh.getReferenceKind())
+ " " + constantToString(cmh.getReferenceIndex(),
getConstant(cmh.getReferenceIndex()).getTag());
break;
case Const.CONSTANT_MethodType:
final ConstantMethodType cmt = (ConstantMethodType) c;
str = constantToString(cmt.getDescriptorIndex(), Const.CONSTANT_Utf8);
break;
case Const.CONSTANT_InvokeDynamic:
final ConstantInvokeDynamic cid = (ConstantInvokeDynamic) c;
str = cid.getBootstrapMethodAttrIndex()
+ ":" + constantToString(cid.getNameAndTypeIndex(),
Const.CONSTANT_NameAndType);
break;
case Const.CONSTANT_Module:
i = ((ConstantModule) c).getNameIndex();
c = getConstant(i, Const.CONSTANT_Utf8);
str = Utility.compactClassName(((ConstantUtf8) c).getBytes(), false);
break;
case Const.CONSTANT_Package:
i = ((ConstantPackage) c).getNameIndex();
c = getConstant(i, Const.CONSTANT_Utf8);
str = Utility.compactClassName(((ConstantUtf8) c).getBytes(), false);
break;
default: // Never reached
throw new IllegalArgumentException("Unknown constant type " + tag);
}
return str;
}
Example 4
| Source File: Constant.java From commons-bcel with Apache License 2.0 | 4 votes |
|
/**
* Reads one constant from the given input, the type depends on a tag byte.
*
* @param dataInput Input stream
* @return Constant object
* @throws IOException if an I/O error occurs reading from the given {@code dataInput}.
* @throws ClassFormatException if the next byte is not recognized
* @since 6.0 made public
*/
public static Constant readConstant(final DataInput dataInput) throws IOException, ClassFormatException {
final byte b = dataInput.readByte(); // Read tag byte
switch (b) {
case Const.CONSTANT_Class:
return new ConstantClass(dataInput);
case Const.CONSTANT_Fieldref:
return new ConstantFieldref(dataInput);
case Const.CONSTANT_Methodref:
return new ConstantMethodref(dataInput);
case Const.CONSTANT_InterfaceMethodref:
return new ConstantInterfaceMethodref(dataInput);
case Const.CONSTANT_String:
return new ConstantString(dataInput);
case Const.CONSTANT_Integer:
return new ConstantInteger(dataInput);
case Const.CONSTANT_Float:
return new ConstantFloat(dataInput);
case Const.CONSTANT_Long:
return new ConstantLong(dataInput);
case Const.CONSTANT_Double:
return new ConstantDouble(dataInput);
case Const.CONSTANT_NameAndType:
return new ConstantNameAndType(dataInput);
case Const.CONSTANT_Utf8:
return ConstantUtf8.getInstance(dataInput);
case Const.CONSTANT_MethodHandle:
return new ConstantMethodHandle(dataInput);
case Const.CONSTANT_MethodType:
return new ConstantMethodType(dataInput);
case Const.CONSTANT_Dynamic:
return new ConstantDynamic(dataInput);
case Const.CONSTANT_InvokeDynamic:
return new ConstantInvokeDynamic(dataInput);
case Const.CONSTANT_Module:
return new ConstantModule(dataInput);
case Const.CONSTANT_Package:
return new ConstantPackage(dataInput);
default:
throw new ClassFormatException("Invalid byte tag in constant pool: " + b);
}
}
