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1: /* StepFilter.java -- a step filter 2: Copyright (C) 2005, 2007 Free Software Foundation 3: 4: This file is part of GNU Classpath. 5: 6: GNU Classpath is free software; you can redistribute it and/or modify 7: it under the terms of the GNU General Public License as published by 8: the Free Software Foundation; either version 2, or (at your option) 9: any later version. 10: 11: GNU Classpath is distributed in the hope that it will be useful, but 12: WITHOUT ANY WARRANTY; without even the implied warranty of 13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14: General Public License for more details. 15: 16: You should have received a copy of the GNU General Public License 17: along with GNU Classpath; see the file COPYING. If not, write to the 18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19: 02110-1301 USA. 20: 21: Linking this library statically or dynamically with other modules is 22: making a combined work based on this library. Thus, the terms and 23: conditions of the GNU General Public License cover the whole 24: combination. 25: 26: As a special exception, the copyright holders of this library give you 27: permission to link this library with independent modules to produce an 28: executable, regardless of the license terms of these independent 29: modules, and to copy and distribute the resulting executable under 30: terms of your choice, provided that you also meet, for each linked 31: terms of your choice, provided that you also meet, for each linked 32: independent module, the terms and conditions of the license of that 33: module. An independent module is a module which is not derived from 34: or based on this library. If you modify this library, you may extend 35: this exception to your version of the library, but you are not 36: obligated to do so. If you do not wish to do so, delete this 37: exception statement from your version. */ 38: 39: 40: package gnu.classpath.jdwp.event.filters; 41: 42: import gnu.classpath.jdwp.JdwpConstants; 43: import gnu.classpath.jdwp.event.Event; 44: import gnu.classpath.jdwp.exception.InvalidThreadException; 45: import gnu.classpath.jdwp.id.ThreadId; 46: 47: /** 48: * "An event filter which restricts reported step events to those which 49: * satisfy depth and size constraints. This modifier can only be used with 50: * step event kinds." 51: * 52: * This "filter" is not really a filter. It is simply a way to communicate 53: * stepping information in a convenient way between the JDWP backend and 54: * the virtual machine. 55: * 56: * Consequently, this "filter" always matches. 57: * 58: * @author Keith Seitz (keiths@redhat.com) 59: */ 60: public class StepFilter 61: implements IEventFilter 62: { 63: private ThreadId _tid; 64: private int _size; 65: private int _depth; 66: 67: /** 68: * Constructs a new StepFilter 69: * 70: * @param tid ID of the thread in which to step 71: * @param size size of each step 72: * @param depth relative call stack limit 73: * @throws InvalidThreadException if thread is invalid 74: */ 75: public StepFilter (ThreadId tid, int size, int depth) 76: throws InvalidThreadException 77: { 78: if (tid.getReference().get () == null) 79: throw new InvalidThreadException (tid.getId ()); 80: 81: _tid = tid; 82: _size = size; 83: _depth = depth; 84: } 85: 86: /** 87: * Returns the thread in which to step 88: * 89: * @return the thread's ID 90: */ 91: public ThreadId getThread () 92: { 93: return _tid; 94: } 95: 96: /** 97: * Returns the size of each step (insn, line) 98: * 99: * @return the step size 100: * @see gnu.classpath.jdwp.JdwpConstants.StepSize 101: */ 102: public int getSize () 103: { 104: return _size; 105: } 106: 107: /** 108: * Returns the relative call stack limit (into, over, out) 109: * 110: * @return how to step 111: * @see gnu.classpath.jdwp.JdwpConstants.StepDepth 112: */ 113: public int getDepth () 114: { 115: return _depth; 116: } 117: 118: /** 119: * Does the given event match the filter? 120: * 121: * @param event the <code>Event</code> to scrutinize 122: */ 123: public boolean matches (Event event) 124: { 125: return true; 126: } 127: }