| /* |
| * reserved comment block |
| * DO NOT REMOVE OR ALTER! |
| */ |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.sun.org.apache.bcel.internal.classfile; |
| |
| import java.io.DataInput; |
| import java.io.DataOutputStream; |
| import java.io.IOException; |
| |
| /** |
| * This class represents a (PC offset, line number) pair, i.e., a line number in |
| * the source that corresponds to a relative address in the byte code. This |
| * is used for debugging purposes. |
| * |
| * @see LineNumberTable |
| */ |
| public final class LineNumber implements Cloneable, Node { |
| |
| /** Program Counter (PC) corresponds to line */ |
| private short start_pc; |
| |
| /** number in source file */ |
| private short line_number; |
| |
| /** |
| * Initialize from another object. |
| * |
| * @param c the object to copy |
| */ |
| public LineNumber(final LineNumber c) { |
| this(c.getStartPC(), c.getLineNumber()); |
| } |
| |
| |
| /** |
| * Construct object from file stream. |
| * |
| * @param file Input stream |
| * @throws IOException if an I/O Exception occurs in readUnsignedShort |
| */ |
| LineNumber(final DataInput file) throws IOException { |
| this(file.readUnsignedShort(), file.readUnsignedShort()); |
| } |
| |
| |
| /** |
| * @param start_pc Program Counter (PC) corresponds to |
| * @param line_number line number in source file |
| */ |
| public LineNumber(final int start_pc, final int line_number) { |
| this.start_pc = (short) start_pc; |
| this.line_number = (short)line_number; |
| } |
| |
| |
| /** |
| * 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.visitLineNumber(this); |
| } |
| |
| |
| /** |
| * Dump line number/pc pair to file stream in binary format. |
| * |
| * @param file Output file stream |
| * @throws IOException if an I/O Exception occurs in writeShort |
| */ |
| public void dump( final DataOutputStream file ) throws IOException { |
| file.writeShort(start_pc); |
| file.writeShort(line_number); |
| } |
| |
| |
| /** |
| * @return Corresponding source line |
| */ |
| public int getLineNumber() { |
| return 0xffff & line_number; |
| } |
| |
| |
| /** |
| * @return PC in code |
| */ |
| public int getStartPC() { |
| return 0xffff & start_pc; |
| } |
| |
| |
| /** |
| * @param line_number the source line number |
| */ |
| public void setLineNumber( final int line_number ) { |
| this.line_number = (short) line_number; |
| } |
| |
| |
| /** |
| * @param start_pc the pc for this line number |
| */ |
| public void setStartPC( final int start_pc ) { |
| this.start_pc = (short) start_pc; |
| } |
| |
| |
| /** |
| * @return String representation |
| */ |
| @Override |
| public String toString() { |
| return "LineNumber(" + start_pc + ", " + line_number + ")"; |
| } |
| |
| |
| /** |
| * @return deep copy of this object |
| */ |
| public LineNumber copy() { |
| try { |
| return (LineNumber) clone(); |
| } catch (final CloneNotSupportedException e) { |
| // TODO should this throw? |
| } |
| return null; |
| } |
| } |