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package com.sun.org.apache.bcel.internal.classfile;

import java.io.DataInput;
import java.io.DataOutputStream;
import java.io.IOException;

import com.sun.org.apache.bcel.internal.Const;

This class represents the table of exceptions that are thrown by a method. This attribute may be used once per method. The name of this class is ExceptionTable for historical reasons; The Java Virtual Machine Specification, Second Edition defines this attribute using the name Exceptions (which is inconsistent with the other classes).
See Also:
  • Code
/** * This class represents the table of exceptions that are thrown by a * method. This attribute may be used once per method. The name of * this class is <em>ExceptionTable</em> for historical reasons; The * Java Virtual Machine Specification, Second Edition defines this * attribute using the name <em>Exceptions</em> (which is inconsistent * with the other classes). * * @see Code */
public final class ExceptionTable extends Attribute { private int[] exception_index_table; // constant pool
Initialize from another object. Note that both objects use the same references (shallow copy). Use copy() for a physical copy.
/** * Initialize from another object. Note that both objects use the same * references (shallow copy). Use copy() for a physical copy. */
public ExceptionTable(final ExceptionTable c) { this(c.getNameIndex(), c.getLength(), c.getExceptionIndexTable(), c.getConstantPool()); }
Params:
  • name_index – Index in constant pool
  • length – Content length in bytes
  • exception_index_table – Table of indices in constant pool
  • constant_pool – Array of constants
/** * @param name_index Index in constant pool * @param length Content length in bytes * @param exception_index_table Table of indices in constant pool * @param constant_pool Array of constants */
public ExceptionTable(final int name_index, final int length, final int[] exception_index_table, final ConstantPool constant_pool) { super(Const.ATTR_EXCEPTIONS, name_index, length, constant_pool); this.exception_index_table = exception_index_table != null ? exception_index_table : new int[0]; }
Construct object from input stream.
Params:
  • name_index – Index in constant pool
  • length – Content length in bytes
  • input – Input stream
  • constant_pool – Array of constants
Throws:
/** * Construct object from input stream. * @param name_index Index in constant pool * @param length Content length in bytes * @param input Input stream * @param constant_pool Array of constants * @throws IOException */
ExceptionTable(final int name_index, final int length, final DataInput input, final ConstantPool constant_pool) throws IOException { this(name_index, length, (int[]) null, constant_pool); final int number_of_exceptions = input.readUnsignedShort(); exception_index_table = new int[number_of_exceptions]; for (int i = 0; i < number_of_exceptions; i++) { exception_index_table[i] = input.readUnsignedShort(); } }
Called by objects that are traversing the nodes of the tree implicitely defined by the contents of a Java class. I.e., the hierarchy of methods, fields, attributes, etc. spawns a tree of objects.
Params:
  • v – Visitor object
/** * Called by objects that are traversing the nodes of the tree implicitely * defined by the contents of a Java class. I.e., the hierarchy of methods, * fields, attributes, etc. spawns a tree of objects. * * @param v Visitor object */
@Override public void accept( final Visitor v ) { v.visitExceptionTable(this); }
Dump exceptions attribute to file stream in binary format.
Params:
  • file – Output file stream
Throws:
/** * Dump exceptions attribute to file stream in binary format. * * @param file Output file stream * @throws IOException */
@Override public void dump( final DataOutputStream file ) throws IOException { super.dump(file); file.writeShort(exception_index_table.length); for (final int index : exception_index_table) { file.writeShort(index); } }
Returns:Array of indices into constant pool of thrown exceptions.
/** * @return Array of indices into constant pool of thrown exceptions. */
public int[] getExceptionIndexTable() { return exception_index_table; }
Returns:Length of exception table.
/** * @return Length of exception table. */
public int getNumberOfExceptions() { return exception_index_table == null ? 0 : exception_index_table.length; }
Returns:class names of thrown exceptions
/** * @return class names of thrown exceptions */
public String[] getExceptionNames() { final String[] names = new String[exception_index_table.length]; for (int i = 0; i < exception_index_table.length; i++) { names[i] = super.getConstantPool().getConstantString(exception_index_table[i], Const.CONSTANT_Class).replace('/', '.'); } return names; }
Params:
  • exception_index_table – the list of exception indexes Also redefines number_of_exceptions according to table length.
/** * @param exception_index_table the list of exception indexes * Also redefines number_of_exceptions according to table length. */
public void setExceptionIndexTable( final int[] exception_index_table ) { this.exception_index_table = exception_index_table != null ? exception_index_table : new int[0]; }
Returns:String representation, i.e., a list of thrown exceptions.
/** * @return String representation, i.e., a list of thrown exceptions. */
@Override public String toString() { final StringBuilder buf = new StringBuilder(); String str; buf.append("Exceptions: "); for (int i = 0; i < exception_index_table.length; i++) { str = super.getConstantPool().getConstantString(exception_index_table[i], Const.CONSTANT_Class); buf.append(Utility.compactClassName(str, false)); if (i < exception_index_table.length - 1) { buf.append(", "); } } return buf.toString(); }
Returns:deep copy of this attribute
/** * @return deep copy of this attribute */
@Override public Attribute copy( final ConstantPool _constant_pool ) { final ExceptionTable c = (ExceptionTable) clone(); if (exception_index_table != null) { c.exception_index_table = new int[exception_index_table.length]; System.arraycopy(exception_index_table, 0, c.exception_index_table, 0, exception_index_table.length); } c.setConstantPool(_constant_pool); return c; } }