android-platform-libcore/luni/src/main/java/org/apache/harmony/nio/FileChannelFactory.java

/* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

/*
 * Android Notice
 * In this class the address length was changed from long to int.
 * This is due to performance optimizations for the device.
 */

package org.apache.harmony.nio;

import java.nio.channels.FileChannel;
import org.apache.harmony.luni.platform.IFileSystem;
import org.apache.harmony.nio.internal.ReadOnlyFileChannel;
import org.apache.harmony.nio.internal.ReadWriteFileChannel;
import org.apache.harmony.nio.internal.WriteOnlyFileChannel;

/**
 * A simple factory to provide a generic way to create FileChannel
 * implementation from within the java.io package.
 */
public class FileChannelFactory {
    public static FileChannel getFileChannel(Object stream, int fd, int mode) {
        switch (mode) {
            case IFileSystem.O_RDONLY:
                return new ReadOnlyFileChannel(stream, fd);
            case IFileSystem.O_WRONLY:
                return new WriteOnlyFileChannel(stream, fd);
            case IFileSystem.O_RDWR:
                return new ReadWriteFileChannel(stream, fd);
            case IFileSystem.O_RDWRSYNC:
                return new ReadWriteFileChannel(stream, fd);
            case IFileSystem.O_APPEND:
                return new WriteOnlyFileChannel(stream, fd, true);
            default:
                throw new RuntimeException("Unknown file channel type " + mode);
        }
    }
}