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Java example source code file (TypeArrayKlass.java)

This example Java source code file (TypeArrayKlass.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

objarrayklass, runtimeexception, string, t_boolean, t_byte, t_char, t_double, t_float, t_int, t_long, t_short, typearrayklass, unknown, util

The TypeArrayKlass.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.*;
import sun.jvm.hotspot.utilities.*;

// TypeArrayKlass is a proxy for TypeArrayKlass in the JVM

public class TypeArrayKlass extends ArrayKlass {
  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 t             = db.lookupType("TypeArrayKlass");
    maxLength          = new CIntField(t.getCIntegerField("_max_length"), 0);
  }

  public TypeArrayKlass(Address addr) {
    super(addr);
  }

  private static CIntField  maxLength;

  public long getMaxLength()          { return  maxLength.getValue(this); }

  public static final int T_BOOLEAN = 4;
  public static final int T_CHAR    = 5;
  public static final int T_FLOAT   = 6;
  public static final int T_DOUBLE  = 7;
  public static final int T_BYTE    = 8;
  public static final int T_SHORT   = 9;
  public static final int T_INT     = 10;
  public static final int T_LONG    = 11;

  public String getTypeName() {
    switch ((int) getElementType()) {
      case T_BOOLEAN: return "[Z";
      case T_CHAR:    return "[C";
      case T_FLOAT:   return "[F";
      case T_DOUBLE:  return "[D";
      case T_BYTE:    return "[B";
      case T_SHORT:   return "[S";
      case T_INT:     return "[I";
      case T_LONG:    return "[J";
    }
    return "Unknown TypeArray";
  }

  public String getElementTypeName() {
    switch ((int) getElementType()) {
      case T_BOOLEAN: return "boolean";
      case T_CHAR:    return "char";
      case T_FLOAT:   return "float";
      case T_DOUBLE:  return "double";
      case T_BYTE:    return "byte";
      case T_SHORT:   return "short";
      case T_INT:     return "int";
      case T_LONG:    return "long";
    }
    throw new RuntimeException("should not reach here");
  }

  public void printValueOn(PrintStream tty) {
    tty.print("TypeArrayKlass for " + getTypeName());
  }

  public void iterateFields(MetadataVisitor visitor) {
    super.iterateFields(visitor);
      visitor.doCInt(maxLength, true);
    }

  public Klass arrayKlassImpl(boolean orNull, int n) {
    int dimension = (int) getDimension();
    if (Assert.ASSERTS_ENABLED) {
      Assert.that(dimension <= n, "check order of chain");
    }
    if (dimension == n)
      return this;
    ObjArrayKlass ak = (ObjArrayKlass) getHigherDimension();
    if (ak == null) {
      if (orNull) return null;
      // FIXME: would need to change in reflective system to actually
      // allocate klass
      throw new RuntimeException("Can not allocate array klasses in debugging system");
    }
    if (orNull) {
      return ak.arrayKlassOrNull(n);
    }
    return ak.arrayKlass(n);
  }

  public Klass arrayKlassImpl(boolean orNull) {
    return arrayKlassImpl(orNull, (int) (getDimension() + 1));
  }
}

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