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- package javassist.bytecode;
-
- import java.io.DataInputStream;
- import java.io.IOException;
- import java.util.Map;
-
- /**
- * <code>MethodParameters_attribute</code>.
- */
- public class MethodParametersAttribute extends AttributeInfo {
- /**
- * The name of this attribute <code>"MethodParameters"</code>.
- */
- 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++) {
- String name = names[i];
- ByteArray.write16bit(name == null ? 0 : cp.addUtf8Info(name), data, i * 4 + 1);
- ByteArray.write16bit(flags[i], data, i * 4 + 3);
- }
-
- set(data);
- }
-
- /**
- * Returns <code>parameters_count</code>, which is the number of
- * parameters.
- */
- public int size() {
- return info[0] & 0xff;
- }
-
- /**
- * Returns the value of <code>name_index</code> of the i-th element of <code>parameters</code>.
- *
- * @param i the position of the parameter.
- */
- public int name(int i) {
- return ByteArray.readU16bit(info, i * 4 + 1);
- }
-
- /**
- * Returns the name of the i-th element of <code>parameters</code>.
- * @param i the position of the parameter.
- */
- public String parameterName(int i) {
- int index = name(i);
- return index == 0 ? null : getConstPool().getUtf8Info(index);
- }
-
- /**
- * Returns the value of <code>access_flags</code> of the i-th element of <code>parameters</code>.
- *
- * @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.
- */
- @Override
- public AttributeInfo copy(ConstPool newCp, Map<String,String> classnames) {
- int s = size();
- ConstPool cp = getConstPool();
- String[] names = new String[s];
- int[] flags = new int[s];
- for (int i = 0; i < s; i++) {
- int index = name(i);
- names[i] = index == 0 ? null : cp.getUtf8Info(index);
- flags[i] = accessFlags(i);
- }
-
- return new MethodParametersAttribute(newCp, names, flags);
- }
- }
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