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/*
* Copyright (C) 2009 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 com.android.contacts.editor;
import android.os.Bundle;
import android.os.Parcel;
import android.os.Parcelable;
import com.android.contacts.common.model.RawContactDelta;
import com.android.contacts.common.model.ValuesDelta;
import com.android.contacts.common.model.dataitem.DataKind;
/**
* A class that provides unique view ids for {@link ContentEditorView}, {@link KindSectionView},
* {@link LabeledEditorView} and {@link EditView} on {@link EditContactActivity}.
* It is used to assign a unique but consistent id to each view across {@link EditContactActivity}'s
* lifecycle, so that we can re-construct view state (e.g. focused view) when the screen rotates.
*
* <p>This class is not thread safe.
*/
public final class ViewIdGenerator implements Parcelable {
private static final int INVALID_VIEW_ID = 0;
private static final int INITIAL_VIEW_ID = 1;
public static final int NO_VIEW_INDEX = -1;
private int mNextId;
/**
* Used as a map from the "key" of the views to actual ids. {@link #getId()} generates keys for
* the views.
*/
private Bundle mIdMap = new Bundle();
private static final char KEY_SEPARATOR = '*';
private final static StringBuilder sWorkStringBuilder = new StringBuilder();
public ViewIdGenerator() {
mNextId = INITIAL_VIEW_ID;
}
/** {@inheritDoc} */
public int describeContents() {
return 0;
}
/**
* Returns an id for a view associated with specified contact field.
*
* @param entity {@link RawContactDelta} associated with the view
* @param kind {@link DataKind} associated with the view, or null if none exists.
* @param values {@link ValuesDelta} associated with the view, or null if none exists.
* @param viewIndex index of the view in the parent {@link Editor}, if it's a leave view.
* Otherwise, pass {@link #NO_VIEW_INDEX}.
*/
public int getId(RawContactDelta entity, DataKind kind, ValuesDelta values,
int viewIndex) {
final String k = getMapKey(entity, kind, values, viewIndex);
int id = mIdMap.getInt(k, INVALID_VIEW_ID);
if (id == INVALID_VIEW_ID) {
// Make sure the new id won't conflict with auto-generated ids by masking with 0xffff.
id = (mNextId++) & 0xFFFF;
mIdMap.putInt(k, id);
}
return id;
}
private static String getMapKey(RawContactDelta entity, DataKind kind, ValuesDelta values,
int viewIndex) {
sWorkStringBuilder.setLength(0);
if (entity != null) {
sWorkStringBuilder.append(entity.getValues().getId());
if (kind != null) {
sWorkStringBuilder.append(KEY_SEPARATOR);
sWorkStringBuilder.append(kind.mimeType);
if (values != null) {
sWorkStringBuilder.append(KEY_SEPARATOR);
sWorkStringBuilder.append(values.getId());
if (viewIndex != NO_VIEW_INDEX) {
sWorkStringBuilder.append(KEY_SEPARATOR);
sWorkStringBuilder.append(viewIndex);
}
}
}
}
return sWorkStringBuilder.toString();
}
/** {@Override} */
public void writeToParcel(Parcel dest, int flags) {
dest.writeInt(mNextId);
dest.writeBundle(mIdMap);
}
private void readFromParcel(Parcel src) {
mNextId = src.readInt();
mIdMap = src.readBundle();
}
public static final Parcelable.Creator<ViewIdGenerator> CREATOR =
new Parcelable.Creator<ViewIdGenerator>() {
public ViewIdGenerator createFromParcel(Parcel in) {
final ViewIdGenerator vig = new ViewIdGenerator();
vig.readFromParcel(in);
return vig;
}
public ViewIdGenerator[] newArray(int size) {
return new ViewIdGenerator[size];
}
};
}
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