javassist.bytecode.MethodParametersAttribute Maven / Gradle / Ivy
package javassist.bytecode;
import java.io.DataInputStream;
import java.io.IOException;
import java.util.Map;
/**
* MethodParameters_attribute.
*/
public class MethodParametersAttribute extends AttributeInfo {
/**
* The name of this attribute "MethodParameters".
*/
public static final String tag = "MethodParameters";
MethodParametersAttribute(ConstPool cp, int n, DataInputStream in)
throws IOException
{
super(cp, n, in);
}
/**
* Constructs an attribute.
*
* @param cp a constant pool table.
* @param names an array of parameter names.
* The i-th element is the name of the i-th parameter.
* @param flags an array of parameter access flags.
*/
public MethodParametersAttribute(ConstPool cp, String[] names, int[] flags) {
super(cp, tag);
byte[] data = new byte[names.length * 4 + 1];
data[0] = (byte)names.length;
for (int i = 0; i < names.length; i++) {
ByteArray.write16bit(cp.addUtf8Info(names[i]), data, i * 4 + 1);
ByteArray.write16bit(flags[i], data, i * 4 + 3);
}
set(data);
}
/**
* Returns parameters_count, which is the number of
* parameters.
*/
public int size() {
return info[0] & 0xff;
}
/**
* Returns the value of name_index of the i-th element of parameters.
*
* @param i the position of the parameter.
*/
public int name(int i) {
return ByteArray.readU16bit(info, i * 4 + 1);
}
/**
* Returns the value of access_flags of the i-th element of parameters.
*
* @param i the position of the parameter.
* @see AccessFlag
*/
public int accessFlags(int i) {
return ByteArray.readU16bit(info, i * 4 + 3);
}
/**
* Makes a copy.
*
* @param newCp the constant pool table used by the new copy.
* @param classnames ignored.
*/
public AttributeInfo copy(ConstPool newCp, Map classnames) {
int s = size();
ConstPool cp = getConstPool();
String[] names = new String[s];
int[] flags = new int[s];
for (int i = 0; i < s; i++) {
names[i] = cp.getUtf8Info(name(i));
flags[i] = accessFlags(i);
}
return new MethodParametersAttribute(newCp, names, flags);
}
}