77 lines
2.3 KiB
Java
77 lines
2.3 KiB
Java
/*
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* Copyright (C) 2015 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 com.android.mtp;
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/**
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* Static utilities for ID.
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*/
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class Identifier {
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final int mDeviceId;
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final int mStorageId;
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final int mObjectHandle;
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static Identifier createFromRootId(String rootId) {
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final String[] components = rootId.split("_");
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return new Identifier(
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Integer.parseInt(components[0]),
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Integer.parseInt(components[1]));
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}
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static Identifier createFromDocumentId(String documentId) {
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final String[] components = documentId.split("_");
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return new Identifier(
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Integer.parseInt(components[0]),
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Integer.parseInt(components[1]),
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Integer.parseInt(components[2]));
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}
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Identifier(int deviceId, int storageId) {
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this(deviceId, storageId, CursorHelper.DUMMY_HANDLE_FOR_ROOT);
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}
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Identifier(int deviceId, int storageId, int objectHandle) {
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mDeviceId = deviceId;
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mStorageId = storageId;
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mObjectHandle = objectHandle;
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}
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// TODO: Make the ID persistent.
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String toRootId() {
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return String.format("%d_%d", mDeviceId, mStorageId);
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}
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// TODO: Make the ID persistent.
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String toDocumentId() {
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return String.format("%d_%d_%d", mDeviceId, mStorageId, mObjectHandle);
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}
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@Override
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public boolean equals(Object obj) {
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if (!(obj instanceof Identifier))
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return false;
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final Identifier other = (Identifier)obj;
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return mDeviceId == other.mDeviceId && mStorageId == other.mStorageId &&
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mObjectHandle == other.mObjectHandle;
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}
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@Override
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public int hashCode() {
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return (mDeviceId << 16) ^ (mStorageId << 8) ^ mObjectHandle;
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}
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}
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