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/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.widget;
import java.util.ArrayList;
/**
* ExpandableListPosition can refer to either a group's position or a child's
* position. Referring to a child's position requires both a group position (the
* group containing the child) and a child position (the child's position within
* that group). To create objects, use {@link #obtainChildPosition(int, int)} or
* {@link #obtainGroupPosition(int)}.
*/
class ExpandableListPosition {
private static final int MAX_POOL_SIZE = 5;
private static ArrayList<ExpandableListPosition> sPool =
new ArrayList<ExpandableListPosition>(MAX_POOL_SIZE);
/**
* This data type represents a child position
*/
public final static int CHILD = 1;
/**
* This data type represents a group position
*/
public final static int GROUP = 2;
/**
* The position of either the group being referred to, or the parent
* group of the child being referred to
*/
public int groupPos;
/**
* The position of the child within its parent group
*/
public int childPos;
/**
* The position of the item in the flat list (optional, used internally when
* the corresponding flat list position for the group or child is known)
*/
int flatListPos;
/**
* What type of position this ExpandableListPosition represents
*/
public int type;
private void resetState() {
groupPos = 0;
childPos = 0;
flatListPos = 0;
type = 0;
}
private ExpandableListPosition() {
}
long getPackedPosition() {
if (type == CHILD) return ExpandableListView.getPackedPositionForChild(groupPos, childPos);
else return ExpandableListView.getPackedPositionForGroup(groupPos);
}
static ExpandableListPosition obtainGroupPosition(int groupPosition) {
return obtain(GROUP, groupPosition, 0, 0);
}
static ExpandableListPosition obtainChildPosition(int groupPosition, int childPosition) {
return obtain(CHILD, groupPosition, childPosition, 0);
}
static ExpandableListPosition obtainPosition(long packedPosition) {
if (packedPosition == ExpandableListView.PACKED_POSITION_VALUE_NULL) {
return null;
}
ExpandableListPosition elp = getRecycledOrCreate();
elp.groupPos = ExpandableListView.getPackedPositionGroup(packedPosition);
if (ExpandableListView.getPackedPositionType(packedPosition) ==
ExpandableListView.PACKED_POSITION_TYPE_CHILD) {
elp.type = CHILD;
elp.childPos = ExpandableListView.getPackedPositionChild(packedPosition);
} else {
elp.type = GROUP;
}
return elp;
}
static ExpandableListPosition obtain(int type, int groupPos, int childPos, int flatListPos) {
ExpandableListPosition elp = getRecycledOrCreate();
elp.type = type;
elp.groupPos = groupPos;
elp.childPos = childPos;
elp.flatListPos = flatListPos;
return elp;
}
private static ExpandableListPosition getRecycledOrCreate() {
ExpandableListPosition elp;
synchronized (sPool) {
if (sPool.size() > 0) {
elp = sPool.remove(0);
} else {
return new ExpandableListPosition();
}
}
elp.resetState();
return elp;
}
/**
* Do not call this unless you obtained this via ExpandableListPosition.obtain().
* PositionMetadata will handle recycling its own children.
*/
public void recycle() {
synchronized (sPool) {
if (sPool.size() < MAX_POOL_SIZE) {
sPool.add(this);
}
}
}
}
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