com.wavemaker.commons.io.FileContent Maven / Gradle / Ivy
/**
* Copyright (C) 2020 WaveMaker, Inc.
*
* 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.wavemaker.commons.io;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Writer;
import com.wavemaker.commons.io.exception.ResourceException;
/**
* Provides access to {@link File} content in a variety of ways.
*
* @see File
*
* @author Phillip Webb
*/
public interface FileContent {
/**
* Return an {@link InputStream} that can be used to access file contents. This method can be called multiple times
* if required. The stream should be closed by the caller.
*
* @return The file contents {@link InputStream}
*/
InputStream asInputStream();
/**
* Return a {@link Reader} that can be used to access file contents. This method can be called multiple times if
* required. The reader should be closed by the caller.
*
* @return the file contents {@link Reader}
* @throws ResourceException
*/
Reader asReader();
/**
* Return the contents of the file as a String. This method should be used with caution if working with
* large files.
*
* @return the contents as a String
* @throws ResourceException
*/
String asString();
/**
* Return the contents of the file as a new byte array. This method should be used with caution if working
* with large files.
*
* @return the contents as a new byte array.
* @throws ResourceException
*/
byte[] asBytes();
/**
* Copy the contents of the file to another stream, closing the stream when complete.
*
* @param outputStream
* @throws ResourceException
*/
void copyTo(OutputStream outputStream);
/**
* Copy the contents of the file to another writer, closing the writer when complete.
*
* @param outputStream
* @throws ResourceException
*/
void copyTo(Writer writer);
/**
* Return an {@link OutputStream} that can be used to write file contents. The output stream should be closed by the
* caller. When possible, consider using the {@link #write(InputStream)} method instead to ensure that streams are
* closed.
*
* @return The output stream
*/
OutputStream asOutputStream();
/**
* @param append if true, open the file OutputStream in append mode, otherwise as new file
* Return an {@link OutputStream} that can be used to write file contents. The output stream should be closed by the
* caller. When possible, consider using the {@link #write(InputStream)} method instead to ensure that streams are
* closed.
*
* @return The output stream
*/
OutputStream asOutputStream(boolean append);
/**
* Return a {@link Writer} that can be used to write file contents. The writer should be closed by the caller. When
* possible, consider using the {@link #write(Reader)} method instead to ensure that streams are closed.
*
* @return The writer
* @throws ResourceException
*/
Writer asWriter();
/**
* @param append if true, open the file Writer in append mode, otherwise as new file
* Return a {@link Writer} that can be used to write file contents with append mode. The writer should be closed by
* the caller. When possible, consider using the {@link #write(Reader)} method instead to ensure that streams are closed.
*
* @return The writer
* @throws ResourceException
*/
Writer asWriter(boolean append);
/**
* Write the contents of the specified file to this file.
*
* @param file the file to copy.
*/
void write(File file);
/**
* Write the contents of the specified output stream to this file, closing the stream when complete.
*
* @param inputStream the input stream to write
* @throws ResourceException
*/
void write(InputStream inputStream);
/**
* Write the contents of the specified reader to this file, closing the reader when complete.
*
* @param reader the reader to write
* @throws ResourceException
*/
void write(Reader reader);
/**
* Write the contents of the specified string to this file.
*
* @param string the string contents
* @throws ResourceException
*/
void write(String string);
}