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| 1 | /* | ||
| 2 | * Copyright (c) 1997, 2008, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | |||
| 27 | /* | ||
| 28 | * The Original Code is HAT. The Initial Developer of the | ||
| 29 | * Original Code is Bill Foote, with contributions from others | ||
| 30 | * at JavaSoft/Sun. | ||
| 31 | */ | ||
| 32 | |||
| 33 | package com.sun.tools.hat.internal.model; | ||
| 34 | |||
| 35 | import java.io.IOException; | ||
| 36 | import com.sun.tools.hat.internal.parser.ReadBuffer; | ||
| 37 | |||
| 38 | /* | ||
| 39 | * Base class for lazily read Java heap objects. | ||
| 40 | */ | ||
| 41 | public abstract class JavaLazyReadObject extends JavaHeapObject { | ||
| 42 | |||
| 43 | // file offset from which this object data starts | ||
| 44 | private final long offset; | ||
| 45 | |||
| 46 | protected JavaLazyReadObject(long offset) { | ||
| 47 | this.offset = offset; | ||
| 48 | } | ||
| 49 | |||
| 50 | public final int getSize() { | ||
| 51 | return getValueLength() + getClazz().getMinimumObjectSize(); | ||
| 52 | } | ||
| 53 | |||
| 54 | protected final long getOffset() { | ||
| 55 | return offset; | ||
| 56 | } | ||
| 57 | |||
| 58 | // return the length of the data for this object | ||
| 59 | protected final int getValueLength() { | ||
| 60 | try { | ||
| 61 | return readValueLength(); | ||
| 62 | } catch (IOException exp) { | ||
| 63 | System.err.println("lazy read failed at offset " + offset); | ||
| 64 | exp.printStackTrace(); | ||
| 65 | return 0; | ||
| 66 | } | ||
| 67 | } | ||
| 68 | |||
| 69 | // get this object's content as byte array | ||
| 70 | protected final byte[] getValue() { | ||
| 71 | try { | ||
| 72 | return readValue(); | ||
| 73 | } catch (IOException exp) { | ||
| 74 | System.err.println("lazy read failed at offset " + offset); | ||
| 75 | exp.printStackTrace(); | ||
| 76 | return Snapshot.EMPTY_BYTE_ARRAY; | ||
| 77 | } | ||
| 78 | } | ||
| 79 | |||
| 80 | // get ID of this object | ||
| 81 | public final long getId() { | ||
| 82 | try { | ||
| 83 | ReadBuffer buf = getClazz().getReadBuffer(); | ||
| 84 | int idSize = getClazz().getIdentifierSize(); | ||
| 85 | if (idSize == 4) { | ||
| 86 | return ((long)buf.getInt(offset)) & Snapshot.SMALL_ID_MASK; | ||
| 87 | } else { | ||
| 88 | return buf.getLong(offset); | ||
| 89 | } | ||
| 90 | } catch (IOException exp) { | ||
| 91 | System.err.println("lazy read failed at offset " + offset); | ||
| 92 | exp.printStackTrace(); | ||
| 93 | return -1; | ||
| 94 | } | ||
| 95 | } | ||
| 96 | |||
| 97 | protected abstract int readValueLength() throws IOException; | ||
| 98 | protected abstract byte[] readValue() throws IOException; | ||
| 99 | |||
| 100 | // make Integer or Long for given object ID | ||
| 101 | protected static Number makeId(long id) { | ||
| 102 | if ((id & ~Snapshot.SMALL_ID_MASK) == 0) { | ||
| 103 | return new Integer((int)id); | ||
| 104 | } else { | ||
| 105 | return new Long(id); | ||
| 106 | } | ||
| 107 | } | ||
| 108 | |||
| 109 | // get ID as long value from Number | ||
| 110 | protected static long getIdValue(Number num) { | ||
| 111 | long id = num.longValue(); | ||
| 112 | if (num instanceof Integer) { | ||
| 113 | id &= Snapshot.SMALL_ID_MASK; | ||
| 114 | } | ||
| 115 | return id; | ||
| 116 | } | ||
| 117 | |||
| 118 | // read object ID from given index from given byte array | ||
| 119 | protected final long objectIdAt(int index, byte[] data) { | ||
| 120 | int idSize = getClazz().getIdentifierSize(); | ||
| 121 | if (idSize == 4) { | ||
| 122 | return ((long)intAt(index, data)) & Snapshot.SMALL_ID_MASK; | ||
| 123 | } else { | ||
| 124 | return longAt(index, data); | ||
| 125 | } | ||
| 126 | } | ||
| 127 | |||
| 128 | // utility methods to read primitive types from byte array | ||
| 129 | protected static byte byteAt(int index, byte[] value) { | ||
| 130 | return value[index]; | ||
| 131 | } | ||
| 132 | |||
| 133 | protected static boolean booleanAt(int index, byte[] value) { | ||
| 134 | return (value[index] & 0xff) == 0? false: true; | ||
| 135 | } | ||
| 136 | |||
| 137 | protected static char charAt(int index, byte[] value) { | ||
| 138 | int b1 = ((int) value[index++] & 0xff); | ||
| 139 | int b2 = ((int) value[index++] & 0xff); | ||
| 140 | return (char) ((b1 << 8) + b2); | ||
| 141 | } | ||
| 142 | |||
| 143 | protected static short shortAt(int index, byte[] value) { | ||
| 144 | int b1 = ((int) value[index++] & 0xff); | ||
| 145 | int b2 = ((int) value[index++] & 0xff); | ||
| 146 | return (short) ((b1 << 8) + b2); | ||
| 147 | } | ||
| 148 | |||
| 149 | protected static int intAt(int index, byte[] value) { | ||
| 150 | int b1 = ((int) value[index++] & 0xff); | ||
| 151 | int b2 = ((int) value[index++] & 0xff); | ||
| 152 | int b3 = ((int) value[index++] & 0xff); | ||
| 153 | int b4 = ((int) value[index++] & 0xff); | ||
| 154 | return ((b1 << 24) + (b2 << 16) + (b3 << 8) + b4); | ||
| 155 | } | ||
| 156 | |||
| 157 | protected static long longAt(int index, byte[] value) { | ||
| 158 | long val = 0; | ||
| 159 | for (int j = 0; j < 8; j++) { | ||
| 160 | val = val << 8; | ||
| 161 | int b = ((int)value[index++]) & 0xff; | ||
| 162 | val |= b; | ||
| 163 | } | ||
| 164 | return val; | ||
| 165 | } | ||
| 166 | |||
| 167 | protected static float floatAt(int index, byte[] value) { | ||
| 168 | int val = intAt(index, value); | ||
| 169 | return Float.intBitsToFloat(val); | ||
| 170 | } | ||
| 171 | |||
| 172 | protected static double doubleAt(int index, byte[] value) { | ||
| 173 | long val = longAt(index, value); | ||
| 174 | return Double.longBitsToDouble(val); | ||
| 175 | } | ||
| 176 | } | ||