/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.widget;
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import android.database.DataSetObservable;
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import android.database.DataSetObserver;
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/**
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* Base class for a {@link ExpandableListAdapter} used to provide data and Views
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* from some data to an expandable list view.
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* <p>
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* Adapters inheriting this class should verify that the base implementations of
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* {@link #getCombinedChildId(long, long)} and {@link #getCombinedGroupId(long)}
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* are correct in generating unique IDs from the group/children IDs.
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* <p>
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* @see SimpleExpandableListAdapter
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* @see SimpleCursorTreeAdapter
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*/
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public abstract class BaseExpandableListAdapter implements ExpandableListAdapter,
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HeterogeneousExpandableList {
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private final DataSetObservable mDataSetObservable = new DataSetObservable();
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public void registerDataSetObserver(DataSetObserver observer) {
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mDataSetObservable.registerObserver(observer);
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}
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public void unregisterDataSetObserver(DataSetObserver observer) {
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mDataSetObservable.unregisterObserver(observer);
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}
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/**
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* @see DataSetObservable#notifyInvalidated()
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*/
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public void notifyDataSetInvalidated() {
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mDataSetObservable.notifyInvalidated();
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}
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/**
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* @see DataSetObservable#notifyChanged()
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*/
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public void notifyDataSetChanged() {
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mDataSetObservable.notifyChanged();
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}
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public boolean areAllItemsEnabled() {
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return true;
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}
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public void onGroupCollapsed(int groupPosition) {
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}
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public void onGroupExpanded(int groupPosition) {
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}
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/**
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* Override this method if you foresee a clash in IDs based on this scheme:
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* <p>
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* Base implementation returns a long:
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* <li> bit 0: Whether this ID points to a child (unset) or group (set), so for this method
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* this bit will be 1.
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* <li> bit 1-31: Lower 31 bits of the groupId
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* <li> bit 32-63: Lower 32 bits of the childId.
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* <p>
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* {@inheritDoc}
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*/
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public long getCombinedChildId(long groupId, long childId) {
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return 0x8000000000000000L | ((groupId & 0x7FFFFFFF) << 32) | (childId & 0xFFFFFFFF);
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}
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/**
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* Override this method if you foresee a clash in IDs based on this scheme:
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* <p>
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* Base implementation returns a long:
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* <li> bit 0: Whether this ID points to a child (unset) or group (set), so for this method
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* this bit will be 0.
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* <li> bit 1-31: Lower 31 bits of the groupId
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* <li> bit 32-63: Lower 32 bits of the childId.
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* <p>
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* {@inheritDoc}
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*/
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public long getCombinedGroupId(long groupId) {
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return (groupId & 0x7FFFFFFF) << 32;
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}
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/**
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* {@inheritDoc}
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*/
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public boolean isEmpty() {
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return getGroupCount() == 0;
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}
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/**
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* {@inheritDoc}
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* @return 0 for any group or child position, since only one child type count is declared.
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*/
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public int getChildType(int groupPosition, int childPosition) {
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return 0;
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}
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/**
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* {@inheritDoc}
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* @return 1 as a default value in BaseExpandableListAdapter.
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*/
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public int getChildTypeCount() {
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return 1;
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}
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/**
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* {@inheritDoc}
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* @return 0 for any groupPosition, since only one group type count is declared.
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*/
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public int getGroupType(int groupPosition) {
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return 0;
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}
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/**
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* {@inheritDoc}
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* @return 1 as a default value in BaseExpandableListAdapter.
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*/
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public int getGroupTypeCount() {
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return 1;
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}
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}
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