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1: /* Location.java -- class to read/write JDWP locations 2: Copyright (C) 2005 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: independent module, the terms and conditions of the license of that 32: module. An independent module is a module which is not derived from 33: or based on this library. If you modify this library, you may extend 34: this exception to your version of the library, but you are not 35: obligated to do so. If you do not wish to do so, delete this 36: exception statement from your version. */ 37: 38: 39: package gnu.classpath.jdwp.util; 40: 41: import gnu.classpath.jdwp.VMIdManager; 42: import gnu.classpath.jdwp.exception.JdwpException; 43: import gnu.classpath.jdwp.id.ClassReferenceTypeId; 44: import gnu.classpath.jdwp.id.ObjectId; 45: 46: import java.io.DataOutputStream; 47: import java.io.IOException; 48: import java.lang.reflect.Method; 49: import java.nio.ByteBuffer; 50: 51: /** 52: * A class to read/write JDWP locations. 53: * 54: * @author Aaron Luchko <aluchko@redhat.com> 55: */ 56: public class Location 57: { 58: 59: private ClassReferenceTypeId crti; 60: 61: private int index; 62: 63: private byte tag; 64: 65: private ObjectId mid; 66: 67: /** 68: * Create a location with the given parameters. 69: * 70: * @param tag the type of construct the location is in 71: * @param clazz the class the location is in 72: * @param meth the Method 73: * @param index location in the method 74: * @throws JdwpException 75: */ 76: public Location(byte tag, Class clazz, Method meth, int index) 77: throws JdwpException 78: { 79: this.tag = tag; 80: this.crti = 81: (ClassReferenceTypeId) VMIdManager.getDefault().getReferenceTypeId(clazz); 82: this.mid = VMIdManager.getDefault().getObjectId(meth); 83: this.index = index; 84: } 85: 86: /** 87: * Read a location from the given bytebuffer, consists of a TAG (byte), 88: * followed by a ReferenceTypeId, a MethodId and an index (int). 89: * 90: * @param bb this holds the location 91: * @throws IOException 92: * @throws JdwpException 93: */ 94: public Location(ByteBuffer bb) throws IOException, JdwpException 95: { 96: this.tag = bb.get(); 97: this.crti = 98: (ClassReferenceTypeId) VMIdManager.getDefault().readReferenceTypeId(bb); 99: this.mid = VMIdManager.getDefault().readObjectId(bb); 100: this.index = bb.getInt(); 101: } 102: 103: /** 104: * Write the given location to an output stream. 105: * 106: * @param os stream to write to 107: * @throws IOException 108: */ 109: public void write(DataOutputStream os) throws IOException 110: { 111: os.writeByte(tag); 112: crti.write(os); 113: mid.write(os); 114: os.writeInt(index); 115: } 116: }