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/*
* Copyright (C) 2015 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.sched.vfs;
import com.android.sched.util.file.CannotCreateFileException;
import com.android.sched.util.file.CannotDeleteFileException;
import com.android.sched.util.file.NoSuchFileException;
import com.android.sched.util.file.NotDirectoryException;
import com.android.sched.util.file.NotFileException;
import com.android.sched.util.file.WrongPermissionException;
import com.android.sched.util.location.Location;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Collection;
import javax.annotation.CheckForNull;
import javax.annotation.Nonnull;
/**
* A base implementation of a {@link VFS}.
*/
abstract class BaseVFS<DIR extends BaseVDir, FILE extends BaseVFile> implements VFS {
protected boolean closed = false;
@Override
@Nonnull
public abstract DIR getRootDir();
//
// Stream related
//
@Nonnull
abstract InputStream openRead(@Nonnull FILE file) throws WrongPermissionException;
@Nonnull
abstract OutputStream openWrite(@Nonnull FILE file) throws WrongPermissionException;
//
// VElement related
//
@Nonnull
abstract DIR getVDir(@Nonnull DIR parent, @Nonnull String name) throws NotDirectoryException,
NoSuchFileException;
@Nonnull
abstract FILE getVFile(@Nonnull DIR parent, @Nonnull String name) throws NotFileException,
NoSuchFileException;
@Nonnull
abstract DIR createVDir(@Nonnull DIR parent, @Nonnull String name)
throws CannotCreateFileException;
@Nonnull
abstract FILE createVFile(@Nonnull DIR parent, @Nonnull String name)
throws CannotCreateFileException;
@Nonnull
abstract void delete(@Nonnull FILE file) throws CannotDeleteFileException;
@Nonnull
abstract Collection<? extends BaseVElement> list(@Nonnull DIR dir);
abstract boolean isEmpty(@Nonnull DIR dir);
//
// Location related
//
@Nonnull
abstract Location getVFileLocation(@Nonnull FILE file);
@Nonnull
abstract Location getVFileLocation(@Nonnull DIR parent, @Nonnull String name);
@Nonnull
abstract Location getVFileLocation(@Nonnull DIR parent, @Nonnull VPath path);
@Nonnull
abstract Location getVDirLocation(@Nonnull DIR dir);
@Nonnull
abstract Location getVDirLocation(@Nonnull DIR parent, @Nonnull String name);
@Nonnull
abstract Location getVDirLocation(@Nonnull DIR parent, @Nonnull VPath path);
//
// Misc
//
synchronized boolean isClosed() {
return closed;
}
@Override
@CheckForNull
public String getDigest() {
return null;
}
}
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