author | ohair |
Tue, 25 May 2010 15:58:33 -0700 | |
changeset 5506 | 202f599c92aa |
parent 715 | f16baef3a20e |
child 25186 | 63e1a2ec30f5 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1997, 2008, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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/* |
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* The Original Code is HAT. The Initial Developer of the |
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* Original Code is Bill Foote, with contributions from others |
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468
642c8c0be52e
6695553: Cleanup GPLv2+SPL legal notices in hat sources
ohair
parents:
2
diff
changeset
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* at JavaSoft/Sun. |
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*/ |
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package com.sun.tools.hat.internal.model; |
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import java.io.IOException; |
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import com.sun.tools.hat.internal.parser.ReadBuffer; |
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/* |
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* Base class for lazily read Java heap objects. |
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*/ |
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public abstract class JavaLazyReadObject extends JavaHeapObject { |
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// file offset from which this object data starts |
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private final long offset; |
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protected JavaLazyReadObject(long offset) { |
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this.offset = offset; |
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} |
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public final int getSize() { |
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return getValueLength() + getClazz().getMinimumObjectSize(); |
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} |
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protected final long getOffset() { |
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return offset; |
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} |
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// return the length of the data for this object |
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protected final int getValueLength() { |
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try { |
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return readValueLength(); |
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} catch (IOException exp) { |
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System.err.println("lazy read failed at offset " + offset); |
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exp.printStackTrace(); |
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return 0; |
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} |
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} |
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// get this object's content as byte array |
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protected final byte[] getValue() { |
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try { |
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return readValue(); |
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} catch (IOException exp) { |
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System.err.println("lazy read failed at offset " + offset); |
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exp.printStackTrace(); |
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return Snapshot.EMPTY_BYTE_ARRAY; |
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} |
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} |
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// get ID of this object |
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public final long getId() { |
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try { |
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ReadBuffer buf = getClazz().getReadBuffer(); |
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int idSize = getClazz().getIdentifierSize(); |
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if (idSize == 4) { |
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return ((long)buf.getInt(offset)) & Snapshot.SMALL_ID_MASK; |
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} else { |
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return buf.getLong(offset); |
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} |
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} catch (IOException exp) { |
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System.err.println("lazy read failed at offset " + offset); |
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exp.printStackTrace(); |
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return -1; |
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} |
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} |
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protected abstract int readValueLength() throws IOException; |
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protected abstract byte[] readValue() throws IOException; |
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// make Integer or Long for given object ID |
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protected static Number makeId(long id) { |
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if ((id & ~Snapshot.SMALL_ID_MASK) == 0) { |
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return new Integer((int)id); |
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} else { |
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return new Long(id); |
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} |
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} |
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// get ID as long value from Number |
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protected static long getIdValue(Number num) { |
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long id = num.longValue(); |
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if (num instanceof Integer) { |
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id &= Snapshot.SMALL_ID_MASK; |
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} |
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return id; |
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} |
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// read object ID from given index from given byte array |
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protected final long objectIdAt(int index, byte[] data) { |
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int idSize = getClazz().getIdentifierSize(); |
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if (idSize == 4) { |
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return ((long)intAt(index, data)) & Snapshot.SMALL_ID_MASK; |
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} else { |
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return longAt(index, data); |
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} |
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} |
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// utility methods to read primitive types from byte array |
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protected static byte byteAt(int index, byte[] value) { |
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return value[index]; |
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} |
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protected static boolean booleanAt(int index, byte[] value) { |
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return (value[index] & 0xff) == 0? false: true; |
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} |
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protected static char charAt(int index, byte[] value) { |
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int b1 = ((int) value[index++] & 0xff); |
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int b2 = ((int) value[index++] & 0xff); |
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return (char) ((b1 << 8) + b2); |
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} |
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protected static short shortAt(int index, byte[] value) { |
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int b1 = ((int) value[index++] & 0xff); |
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int b2 = ((int) value[index++] & 0xff); |
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return (short) ((b1 << 8) + b2); |
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} |
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protected static int intAt(int index, byte[] value) { |
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int b1 = ((int) value[index++] & 0xff); |
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int b2 = ((int) value[index++] & 0xff); |
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int b3 = ((int) value[index++] & 0xff); |
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int b4 = ((int) value[index++] & 0xff); |
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return ((b1 << 24) + (b2 << 16) + (b3 << 8) + b4); |
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} |
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protected static long longAt(int index, byte[] value) { |
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long val = 0; |
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for (int j = 0; j < 8; j++) { |
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val = val << 8; |
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int b = ((int)value[index++]) & 0xff; |
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val |= b; |
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} |
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return val; |
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} |
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protected static float floatAt(int index, byte[] value) { |
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int val = intAt(index, value); |
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return Float.intBitsToFloat(val); |
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} |
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protected static double doubleAt(int index, byte[] value) { |
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long val = longAt(index, value); |
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return Double.longBitsToDouble(val); |
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} |
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} |