123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175 |
- /*
- * Javassist, a Java-bytecode translator toolkit.
- * Copyright (C) 1999- Shigeru Chiba. All Rights Reserved.
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (the "License"); you may not use this file except in compliance with
- * the License. Alternatively, the contents of this file may be used under
- * the terms of the GNU Lesser General Public License Version 2.1 or later,
- * or the Apache License Version 2.0.
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- */
-
- package javassist.bytecode;
-
- import java.io.DataInputStream;
- import java.io.IOException;
- import java.util.Map;
-
- /**
- * <code>Exceptions_attribute</code>.
- */
- public class ExceptionsAttribute extends AttributeInfo {
- /**
- * The name of this attribute <code>"Exceptions"</code>.
- */
- public static final String tag = "Exceptions";
-
- ExceptionsAttribute(ConstPool cp, int n, DataInputStream in)
- throws IOException
- {
- super(cp, n, in);
- }
-
- /**
- * Constructs a copy of an exceptions attribute.
- *
- * @param cp constant pool table.
- * @param src source attribute.
- */
- private ExceptionsAttribute(ConstPool cp, ExceptionsAttribute src,
- Map<String,String> classnames) {
- super(cp, tag);
- copyFrom(src, classnames);
- }
-
- /**
- * Constructs a new exceptions attribute.
- *
- * @param cp constant pool table.
- */
- public ExceptionsAttribute(ConstPool cp) {
- super(cp, tag);
- byte[] data = new byte[2];
- data[0] = data[1] = 0; // empty
- this.info = data;
- }
-
- /**
- * Makes a copy. Class names are replaced according to the
- * given <code>Map</code> object.
- *
- * @param newCp the constant pool table used by the new copy.
- * @param classnames pairs of replaced and substituted
- * class names. It can be <code>null</code>.
- */
- @Override
- public AttributeInfo copy(ConstPool newCp, Map<String,String> classnames) {
- return new ExceptionsAttribute(newCp, this, classnames);
- }
-
- /**
- * Copies the contents from a source attribute.
- * Specified class names are replaced during the copy.
- *
- * @param srcAttr source Exceptions attribute
- * @param classnames pairs of replaced and substituted
- * class names.
- */
- private void copyFrom(ExceptionsAttribute srcAttr, Map<String,String> classnames) {
- ConstPool srcCp = srcAttr.constPool;
- ConstPool destCp = this.constPool;
- byte[] src = srcAttr.info;
- int num = src.length;
- byte[] dest = new byte[num];
- dest[0] = src[0];
- dest[1] = src[1]; // the number of elements.
- for (int i = 2; i < num; i += 2) {
- int index = ByteArray.readU16bit(src, i);
- ByteArray.write16bit(srcCp.copy(index, destCp, classnames),
- dest, i);
- }
-
- this.info = dest;
- }
-
- /**
- * Returns <code>exception_index_table[]</code>.
- */
- public int[] getExceptionIndexes() {
- byte[] blist = info;
- int n = blist.length;
- if (n <= 2)
- return null;
-
- int[] elist = new int[n / 2 - 1];
- int k = 0;
- for (int j = 2; j < n; j += 2)
- elist[k++] = ((blist[j] & 0xff) << 8) | (blist[j + 1] & 0xff);
-
- return elist;
- }
-
- /**
- * Returns the names of exceptions that the method may throw.
- */
- public String[] getExceptions() {
- byte[] blist = info;
- int n = blist.length;
- if (n <= 2)
- return null;
-
- String[] elist = new String[n / 2 - 1];
- int k = 0;
- for (int j = 2; j < n; j += 2) {
- int index = ((blist[j] & 0xff) << 8) | (blist[j + 1] & 0xff);
- elist[k++] = constPool.getClassInfo(index);
- }
-
- return elist;
- }
-
- /**
- * Sets <code>exception_index_table[]</code>.
- */
- public void setExceptionIndexes(int[] elist) {
- int n = elist.length;
- byte[] blist = new byte[n * 2 + 2];
- ByteArray.write16bit(n, blist, 0);
- for (int i = 0; i < n; ++i)
- ByteArray.write16bit(elist[i], blist, i * 2 + 2);
-
- info = blist;
- }
-
- /**
- * Sets the names of exceptions that the method may throw.
- */
- public void setExceptions(String[] elist) {
- int n = elist.length;
- byte[] blist = new byte[n * 2 + 2];
- ByteArray.write16bit(n, blist, 0);
- for (int i = 0; i < n; ++i)
- ByteArray.write16bit(constPool.addClassInfo(elist[i]),
- blist, i * 2 + 2);
-
- info = blist;
- }
-
- /**
- * Returns <code>number_of_exceptions</code>.
- */
- public int tableLength() { return info.length / 2 - 1; }
-
- /**
- * Returns the value of <code>exception_index_table[nth]</code>.
- */
- public int getException(int nth) {
- int index = nth * 2 + 2; // nth >= 0
- return ((info[index] & 0xff) << 8) | (info[index + 1] & 0xff);
- }
- }
|