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/*
* Copyright (c) 2011, 2015, 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 com.sun.javafx.css;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
/**
* A cache to store values from lookup.
* Consider that there are some number of StyleHelpers and that the
* StyleHelpers are shared. For a particular node, a style might come
* from its StyleHelper or the StyleHelper of one of its parents (ignoring
* Node.style for now). What makes a style unique is the set of StyleHelpers
* that go into its calculation. So, if node N has StyleHelper A and its
* parents have StyleHelper B and C, the opacity style (say) for N is going
* to be unique to the set of StyleHelpers [A B C]. Because StyleHelpers
* are chosen by the rules they match, and because StyleHelpers are shared,
* every node that has the set of StyleHelpers [A B C] will match the same
* selector for opacity (for a given pseudoclass state). Further, the value for
* opacity (in the given pseudoclass state) will not change for the given
* set of StyleHelpers. Therefore, rather than trying to cache a calculated
* value with an individual StyleHelper, the value can be cached with a key
* that uniquely identifies the set [A B C]. Subsequent lookups for the
* property do not need to be recalculated even if there are lookups in the
* value. Incidentally, resolved references will also be unique to a set of
* StyleHelpers and would only need to be resolved once (for a given
* pseudoclass state).
*
* Node.style puts a slight wrinkle in that the style might come from the
* Node rather than the cache. This can be handled in a relatively
* straight-forward manner. If Node.style is not empty or null and it
* contains the property, then that style should be used if the style
* compares less than the style that would have been applied. If there is
* some parent with Node.style that would affect the child Node's style,
* then the cached value can be used.
*
* The key is comprised of this helper's key, plus the
* keys of all this node's parents' helpers.
*
* The values in the cache styles that apply are determined
* by the node's state and the state of its parents. This unique combination
* of states reflects the state of the node and its parents at the time the
* style was first determined. Provided the node and its parents are in the
* same state, then the styles applied will be the same as what is in the
* cache.
*
* The value could be a Map, but there should not be a large number of
* entries. Computing the key from the long[], doing the lookup and
* resolving collisions is probably just as bad, if not worse, than
* finding the matching set of states by comparing the long[].
*
* Since all StyleHelpers are relevant to a Scene, valueCache is
* created by StyleManager.StylesheetContainer and is passed in.
* Note that all StyleHelper instances within a given Scene all
* share the same valueCache!
*/
public final class StyleCache {
public StyleCache() {
// no-op
}
public void clear() {
if (entries == null) return;
Thread.dumpStack();
entries.clear();
}
public StyleCacheEntry getStyleCacheEntry(StyleCacheEntry.Key key) {
StyleCacheEntry entry = null;
if (entries != null) {
entry = entries.get(key);
}
return entry;
}
public void addStyleCacheEntry(StyleCacheEntry.Key key, StyleCacheEntry entry) {
if (entries == null) {
entries = new HashMap<>(5);
}
entries.put(key, entry);
}
public static final class Key {
public Key(int[] styleMapIds, int count) {
this.styleMapIds = new int[count];
System.arraycopy(styleMapIds, 0, this.styleMapIds, 0, count);
}
public Key(Key other) {
this(other.styleMapIds, other.styleMapIds.length);
}
public int[] getStyleMapIds() {
return styleMapIds;
}
@Override public String toString() {
return Arrays.toString(styleMapIds);
}
@Override
public int hashCode() {
if (hash == Integer.MIN_VALUE) {
hash = 3;
if (styleMapIds != null) {
for (int i=0; i entries;
}
