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/*
* Copyright (c) 2010, 2013, 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* 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 jdk.nashorn.internal.runtime;
import java.lang.invoke.MethodHandle;
import jdk.nashorn.internal.runtime.linker.Lookup;
/**
* Property with user defined getters/setters. Actual getter and setter
* functions are stored in underlying ScriptObject. Only the 'slot' info is
* stored in the property.
*
* The slots here denote either ScriptObject embed field number or spill
* array index. For spill array index, we use slot value of
* (index + ScriptObject.embedSize). See also ScriptObject.getEmbedOrSpill
* method. Negative slot value means that the corresponding getter or setter
* is null. Note that always two slots are allocated in ScriptObject - but
* negative (less by 1) slot number is stored for null getter or setter.
* This is done so that when the property is redefined with a different
* getter and setter (say, both non-null), we'll have spill slots to store
* those. When a slot is negative, (-slot - 1) is the embed/spill index.
*/
public final class UserAccessorProperty extends Property {
/** User defined getter function slot. */
private final int getterSlot;
/** User defined setter function slot. */
private final int setterSlot;
/**
* Constructor
*
* @param key property key
* @param flags property flags
* @param getterSlot getter slot, starting at first embed
* @param setterSlot setter slot, starting at first embed
*/
public UserAccessorProperty(final String key, final int flags, final int getterSlot, final int setterSlot) {
super(key, flags, -1);
this.getterSlot = getterSlot;
this.setterSlot = setterSlot;
}
private UserAccessorProperty(final UserAccessorProperty property) {
super(property);
this.getterSlot = property.getterSlot;
this.setterSlot = property.setterSlot;
}
/**
* Return getter slot for this UserAccessorProperty. Slots start with first embed field.
* @return getter slot
*/
public int getGetterSlot() {
return getterSlot < 0 ? -getterSlot - 1 : getterSlot;
}
/**
* Return setter slot for this UserAccessorProperty. Slots start with first embed field.
* @return setter slot
*/
public int getSetterSlot() {
return setterSlot < 0 ? -setterSlot - 1 : setterSlot;
}
@Override
protected Property copy() {
return new UserAccessorProperty(this);
}
@Override
public boolean equals(final Object other) {
if (!super.equals(other)) {
return false;
}
final UserAccessorProperty uc = (UserAccessorProperty) other;
return getterSlot == uc.getterSlot && setterSlot == uc.setterSlot;
}
@Override
public int hashCode() {
return super.hashCode() ^ getterSlot ^ setterSlot;
}
/*
* Accessors.
*/
@Override
public int getSpillCount() {
// calculate how many spill array slots used by this propery.
int count = 0;
if (getGetterSlot() >= ScriptObject.EMBED_SIZE) {
count++;
}
if (getSetterSlot() >= ScriptObject.EMBED_SIZE) {
count++;
}
return count;
}
@Override
public boolean hasGetterFunction() {
return getterSlot > -1;
}
@Override
public boolean hasSetterFunction() {
return setterSlot > -1;
}
@Override
public MethodHandle getGetter(final Class<?> type) {
return Lookup.filterReturnType(ScriptObject.USER_ACCESSOR_GETTER.methodHandle(), type);
}
@Override
public ScriptFunction getGetterFunction(final ScriptObject obj) {
final Object value = obj.getEmbedOrSpill(getterSlot);
return (value instanceof ScriptFunction) ? (ScriptFunction) value : null;
}
@Override
public MethodHandle getSetter(final Class<?> type, final PropertyMap currentMap) {
return ScriptObject.USER_ACCESSOR_SETTER.methodHandle();
}
@Override
public ScriptFunction getSetterFunction(final ScriptObject obj) {
final Object value = obj.getEmbedOrSpill(setterSlot);
return (value instanceof ScriptFunction) ? (ScriptFunction) value : null;
}
}
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