com.sun.webkit.network.FormDataElement Maven / Gradle / Ivy
/*
* Copyright (c) 2011, 2014, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.webkit.network;
import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
/**
* A form data element, such as a byte array or a local file.
*/
abstract class FormDataElement {
/**
* The input stream from which the content of this element
* can be read.
*/
private InputStream inputStream;
/**
* Opens this element and makes its size and content available
* for retrieval.
*/
void open() throws IOException {
inputStream = createInputStream();
}
/**
* Returns the size of this element's content in bytes.
*/
long getSize() {
if (inputStream == null) {
throw new IllegalStateException();
}
return doGetSize();
}
/**
* Returns the input stream from which the content of this element
* can be read.
*/
InputStream getInputStream() {
if (inputStream == null) {
throw new IllegalStateException();
}
return inputStream;
}
/**
* Closes this element and releases all resources associated with it.
* This method makes the element's size and content unavailable
* for retrieval.
* This method is a no op if the element is already closed.
*/
void close() throws IOException {
if (inputStream != null) {
inputStream.close();
inputStream = null;
}
}
/**
* Creates the input stream from which the content of this element
* can be read.
*/
protected abstract InputStream createInputStream() throws IOException;
/**
* Returns the size of this element's content in bytes.
*/
protected abstract long doGetSize();
/**
* Creates a new FormDataElement from a byte array.
*/
private static FormDataElement fwkCreateFromByteArray(byte[] byteArray) {
return new ByteArrayElement(byteArray);
}
/**
* Creates a new FormDataElement from a file.
*/
private static FormDataElement fwkCreateFromFile(String fileName) {
return new FileElement(fileName);
}
/**
* A form data element based on a byte array.
*/
private static final class ByteArrayElement extends FormDataElement {
private final byte[] byteArray;
private ByteArrayElement(byte[] byteArray) {
this.byteArray = byteArray;
}
@Override
protected InputStream createInputStream() {
return new ByteArrayInputStream(byteArray);
}
@Override
protected long doGetSize() {
return byteArray.length;
}
}
/**
* A form data element based on a file.
*/
private static final class FileElement extends FormDataElement {
private final File file;
private FileElement(String filename) {
file = new File(filename);
}
@Override
protected InputStream createInputStream() throws IOException {
return new BufferedInputStream(new FileInputStream(file));
}
@Override
protected long doGetSize() {
return file.length();
}
}
}