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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 | +} | |