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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.event.Event; 43: import gnu.classpath.jdwp.exception.InvalidThreadException; 44: import gnu.classpath.jdwp.id.ThreadId; 45: 46: /** 47: * "An event filter which restricts reported step events to those which 48: * satisfy depth and size constraints. This modifier can only be used with 49: * step event kinds." 50: * 51: * This "filter" is not really a filter. It is simply a way to communicate 52: * stepping information in a convenient way between the JDWP backend and 53: * the virtual machine. 54: * 55: * Consequently, this "filter" always matches. 56: * 57: * @author Keith Seitz (keiths@redhat.com) 58: */ 59: public class StepFilter 60: implements IEventFilter 61: { 62: private ThreadId _tid; 63: private int _size; 64: private int _depth; 65: 66: /** 67: * Constructs a new StepFilter 68: * 69: * @param tid ID of the thread in which to step 70: * @param size size of each step 71: * @param depth relative call stack limit 72: * @throws InvalidThreadException if thread is invalid 73: */ 74: public StepFilter (ThreadId tid, int size, int depth) 75: throws InvalidThreadException 76: { 77: if (tid.getReference().get () == null) 78: throw new InvalidThreadException (tid.getId ()); 79: 80: _tid = tid; 81: _size = size; 82: _depth = depth; 83: } 84: 85: /** 86: * Returns the thread in which to step 87: * 88: * @return the thread's ID 89: */ 90: public ThreadId getThread () 91: { 92: return _tid; 93: } 94: 95: /** 96: * Returns the size of each step (insn, line) 97: * 98: * @return the step size 99: * @see gnu.classpath.jdwp.JdwpConstants.StepSize 100: */ 101: public int getSize () 102: { 103: return _size; 104: } 105: 106: /** 107: * Returns the relative call stack limit (into, over, out) 108: * 109: * @return how to step 110: * @see gnu.classpath.jdwp.JdwpConstants.StepDepth 111: */ 112: public int getDepth () 113: { 114: return _depth; 115: } 116: 117: /** 118: * Does the given event match the filter? 119: * 120: * @param event the <code>Event</code> to scrutinize 121: */ 122: public boolean matches (Event event) 123: { 124: return true; 125: } 126: }