Java example source code file (TypeArray.java)

This example Java source code file (TypeArray.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

arrayindexoutofboundsexception, booleanfield, bytefield, charfield, doublefield, floatfield, intfield, longfield, objectheap, observer, shortfield, typearray, typearrayklass, util, wrongtypeexception

The TypeArray.java Java example source code

/*
 * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

package sun.jvm.hotspot.oops;

import java.io.*;
import java.util.*;
import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.runtime.*;
import sun.jvm.hotspot.types.*;

// A TypeArray is an array containing basic types (non oop elements).
// It is used for arrays of {characters, singles, doubles, bytes, shorts, integers, longs}

public class TypeArray extends Array {
  static {
    VM.registerVMInitializedObserver(new Observer() {
        public void update(Observable o, Object data) {
          initialize(VM.getVM().getTypeDataBase());
        }
      });
  }

  private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
    Type type = db.lookupType("typeArrayOop");
  }

  TypeArray(OopHandle handle, ObjectHeap heap) {
    super(handle, heap);
  }

  public boolean isTypeArray()         { return true; }

  public byte getByteAt(long index) {
    if (index < 0 || index >= getLength()) {
      throw new ArrayIndexOutOfBoundsException(index + " " + getLength());
    }
    long offset = baseOffsetInBytes(BasicType.T_BYTE) + index * getHeap().getByteSize();
    return getHandle().getJByteAt(offset);
  }

  public boolean getBooleanAt(long index) {
    long offset = baseOffsetInBytes(BasicType.T_BOOLEAN) + index * getHeap().getBooleanSize();
    return getHandle().getJBooleanAt(offset);
  }

  public char getCharAt(long index) {
    long offset = baseOffsetInBytes(BasicType.T_CHAR) + index * getHeap().getCharSize();
    return getHandle().getJCharAt(offset);
  }

  public int getIntAt(long index) {
    long offset = baseOffsetInBytes(BasicType.T_INT) + index * getHeap().getIntSize();
    return getHandle().getJIntAt(offset);
  }

  public short getShortAt(long index) {
    long offset = baseOffsetInBytes(BasicType.T_SHORT) + index * getHeap().getShortSize();
    return getHandle().getJShortAt(offset);
  }

  public long getLongAt(long index) {
    long offset = baseOffsetInBytes(BasicType.T_LONG) + index * getHeap().getLongSize();
    return getHandle().getJLongAt(offset);
  }

  public float getFloatAt(long index) {
    long offset = baseOffsetInBytes(BasicType.T_FLOAT) + index * getHeap().getFloatSize();
    return getHandle().getJFloatAt(offset);
  }

  public double getDoubleAt(long index) {
    long offset = baseOffsetInBytes(BasicType.T_DOUBLE) + index * getHeap().getDoubleSize();
    return getHandle().getJDoubleAt(offset);
  }

  public void printValueOn(PrintStream tty) {
    TypeArrayKlass klass = (TypeArrayKlass) getKlass();
    tty.print(klass.getTypeName());
  }

  public void iterateFields(OopVisitor visitor, boolean doVMFields) {
    super.iterateFields(visitor, doVMFields);
    TypeArrayKlass klass = (TypeArrayKlass) getKlass();
    int length = (int) getLength();
    int type   = (int) klass.getElementType();
    for (int index = 0; index < length; index++) {
      FieldIdentifier id = new IndexableFieldIdentifier(index);
      switch (type) {
      case TypeArrayKlass.T_BOOLEAN: {
        long offset = baseOffsetInBytes(BasicType.T_BOOLEAN) + index * getHeap().getBooleanSize();
        visitor.doBoolean(new BooleanField(id, offset, false), false);
        break;
      }
      case TypeArrayKlass.T_CHAR: {
        long offset = baseOffsetInBytes(BasicType.T_CHAR) + index * getHeap().getCharSize();
        visitor.doChar(new CharField(id, offset, false), false);
        break;
      }
      case TypeArrayKlass.T_FLOAT: {
        long offset = baseOffsetInBytes(BasicType.T_FLOAT) + index * getHeap().getFloatSize();
        visitor.doFloat(new FloatField(id, offset, false), false);
        break;
      }
      case TypeArrayKlass.T_DOUBLE: {
        long offset = baseOffsetInBytes(BasicType.T_DOUBLE) + index * getHeap().getDoubleSize();
        visitor.doDouble(new DoubleField(id, offset, false), false);
        break;
      }
      case TypeArrayKlass.T_BYTE: {
        long offset = baseOffsetInBytes(BasicType.T_BYTE) + index * getHeap().getByteSize();
        visitor.doByte(new ByteField(id, offset, false), false);
        break;
      }
      case TypeArrayKlass.T_SHORT: {
        long offset = baseOffsetInBytes(BasicType.T_SHORT) + index * getHeap().getShortSize();
        visitor.doShort(new ShortField(id, offset, false), false);
        break;
      }
      case TypeArrayKlass.T_INT: {
        long offset = baseOffsetInBytes(BasicType.T_INT) + index * getHeap().getIntSize();
        visitor.doInt(new IntField(id, offset, false), false);
        break;
      }
      case TypeArrayKlass.T_LONG: {
        long offset = baseOffsetInBytes(BasicType.T_LONG) + index * getHeap().getLongSize();
        visitor.doLong(new LongField(id, offset, false), false);
        break;
      }
      }
    }
  }
}