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Java example source code file (JSJavaField.java)

This example Java source code file (JSJavaField.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

field_holder, field_is_final, field_is_private, field_is_protected, field_is_public, field_is_static, field_is_transient, field_is_volatile, field_name, field_signature, field_undefined, integer, jsjavafield, object, util

The JSJavaField.java Java example source code

/*
 * Copyright (c) 2004, 2007, 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.utilities.soql;

import java.util.*;
import sun.jvm.hotspot.oops.*;
import sun.jvm.hotspot.runtime.*;

public class JSJavaField extends DefaultScriptObject {
   private static final int FIELD_NAME               = 0;
   private static final int FIELD_SIGNATURE          = 1;
   private static final int FIELD_HOLDER             = 2;
   private static final int FIELD_IS_PRIVATE         = 3;
   private static final int FIELD_IS_PUBLIC          = 4;
   private static final int FIELD_IS_PROTECTED       = 5;
   private static final int FIELD_IS_PACKAGE_PRIVATE = 6;
   private static final int FIELD_IS_STATIC          = 7;
   private static final int FIELD_IS_FINAL           = 8;
   private static final int FIELD_IS_VOLATILE        = 9;
   private static final int FIELD_IS_TRANSIENT       = 10;
   private static final int FIELD_IS_SYNTHETIC       = 11;
   private static final int FIELD_UNDEFINED          = -1;

   public JSJavaField(Field f, JSJavaFactory fac) {
      this.field = f;
      this.factory = fac;
   }

   public Object get(String name) {
      int fieldID = getFieldID(name);
      switch (fieldID) {
      case FIELD_NAME:
         return field.getID().getName();
      case FIELD_SIGNATURE:
         return field.getSignature().asString();
      case FIELD_HOLDER:
         return getFieldHolder();
      case FIELD_IS_PRIVATE:
         return Boolean.valueOf(field.isPrivate());
      case FIELD_IS_PUBLIC:
         return Boolean.valueOf(field.isPublic());
      case FIELD_IS_PROTECTED:
         return Boolean.valueOf(field.isProtected());
      case FIELD_IS_PACKAGE_PRIVATE:
         return Boolean.valueOf(field.isPackagePrivate());
      case FIELD_IS_STATIC:
         return Boolean.valueOf(field.isStatic());
      case FIELD_IS_FINAL:
         return Boolean.valueOf(field.isFinal());
      case FIELD_IS_VOLATILE:
         return Boolean.valueOf(field.isVolatile());
      case FIELD_IS_TRANSIENT:
         return Boolean.valueOf(field.isTransient());
      case FIELD_IS_SYNTHETIC:
         return Boolean.valueOf(field.isSynthetic());
      case FIELD_UNDEFINED:
      default:
          return super.get(name);
      }
   }

   public Object[] getIds() {
      Object[] fieldNames = fields.keySet().toArray();
      Object[] superFields = super.getIds();
      Object[] res = new Object[fieldNames.length + superFields.length];
      System.arraycopy(fieldNames, 0, res, 0, fieldNames.length);
      System.arraycopy(superFields, 0, res, fieldNames.length, superFields.length);
      return res;
   }

   public boolean has(String name) {
      if (getFieldID(name) != FIELD_UNDEFINED) {
          return true;
      } else {
          return super.has(name);
      }
   }

   public void put(String name, Object value) {
       if (getFieldID(name) == FIELD_UNDEFINED) {
           super.put(name, value);
       }
   }

   public boolean equals(Object o) {
      if (o == null || !(o instanceof JSJavaField)) {
         return false;
      }

      JSJavaField other = (JSJavaField) o;
      return field.equals(other.field);
   }

   public int hashCode() {
      return field.hashCode();
   }

   public String toString() {
      StringBuffer buf = new StringBuffer();
      buf.append("Field ");
      buf.append(field.getFieldHolder().getName().asString().replace('/', '.'));
      buf.append('.');
      buf.append(field.getID().getName());
      return buf.toString();
   }

   //-- Internals only below this point
   private JSJavaObject getFieldHolder() {
      return factory.newJSJavaKlass(field.getFieldHolder()).getJSJavaClass();
   }

   private static Map fields = new HashMap();
   private static void addField(String name, int fieldId) {
      fields.put(name, new Integer(fieldId));
   }

   private static int getFieldID(String name) {
      Integer res = (Integer) fields.get(name);
      return (res != null)? res.intValue() : FIELD_UNDEFINED;
   }

   static {
      addField("name", FIELD_NAME);
      addField("signature", FIELD_SIGNATURE);
      addField("holder", FIELD_HOLDER);
      addField("isPrivate", FIELD_IS_PRIVATE);
      addField("isPublic", FIELD_IS_PUBLIC);
      addField("isProtected", FIELD_IS_PROTECTED);
      addField("isPackagePrivate", FIELD_IS_PACKAGE_PRIVATE);
      addField("isStatic", FIELD_IS_STATIC);
      addField("isFinal", FIELD_IS_FINAL);
      addField("isVolatile", FIELD_IS_VOLATILE);
      addField("isTransient", FIELD_IS_TRANSIENT);
      addField("isSynthetic", FIELD_IS_SYNTHETIC);
   }

   private final Field field;
   private final JSJavaFactory factory;
}

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