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The Netty project is an effort to provide an asynchronous event-driven network application framework and tools for rapid development of maintainable high performance and high scalability protocol servers and clients. In other words, Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server.

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/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project 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.
 */
package org.jboss.netty.handler.codec.http.multipart;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.Charset;

import org.jboss.netty.buffer.ChannelBuffer;

/**
 * Mixed implementation using both in Memory and in File with a limit of size
 */
public class MixedAttribute implements Attribute {
    private Attribute attribute;

    private final long limitSize;

    public MixedAttribute(String name, long limitSize) {
        this.limitSize = limitSize;
        attribute = new MemoryAttribute(name);
    }

    public MixedAttribute(String name, String value, long limitSize) {
        this.limitSize = limitSize;
        if (value.length() > this.limitSize) {
            try {
                attribute = new DiskAttribute(name, value);
            } catch (IOException e) {
                // revert to Memory mode
                try {
                    attribute = new MemoryAttribute(name, value);
                } catch (IOException e1) {
                    throw new IllegalArgumentException(e);
                }
            }
        } else {
            try {
                attribute = new MemoryAttribute(name, value);
            } catch (IOException e) {
                throw new IllegalArgumentException(e);
            }
        }
    }

    public void addContent(ChannelBuffer buffer, boolean last) throws IOException {
        if (attribute instanceof MemoryAttribute) {
            if (attribute.length() + buffer.readableBytes() > limitSize) {
                DiskAttribute diskAttribute = new DiskAttribute(attribute
                        .getName());
                if (((MemoryAttribute) attribute).getChannelBuffer() != null) {
                    diskAttribute.addContent(((MemoryAttribute) attribute)
                        .getChannelBuffer(), false);
                }
                attribute = diskAttribute;
            }
        }
        attribute.addContent(buffer, last);
    }

    public void delete() {
        attribute.delete();
    }

    public byte[] get() throws IOException {
        return attribute.get();
    }

    public ChannelBuffer getChannelBuffer() throws IOException {
        return attribute.getChannelBuffer();
    }

    public Charset getCharset() {
        return attribute.getCharset();
    }

    public String getString() throws IOException {
        return attribute.getString();
    }

    public String getString(Charset encoding) throws IOException {
        return attribute.getString(encoding);
    }

    public boolean isCompleted() {
        return attribute.isCompleted();
    }

    public boolean isInMemory() {
        return attribute.isInMemory();
    }

    public long length() {
        return attribute.length();
    }

    public boolean renameTo(File dest) throws IOException {
        return attribute.renameTo(dest);
    }

    public void setCharset(Charset charset) {
        attribute.setCharset(charset);
    }

    public void setContent(ChannelBuffer buffer) throws IOException {
        if (buffer.readableBytes() > limitSize) {
            if (attribute instanceof MemoryAttribute) {
                // change to Disk
                attribute = new DiskAttribute(attribute.getName());
            }
        }
        attribute.setContent(buffer);
    }

    public void setContent(File file) throws IOException {
        if (file.length() > limitSize) {
            if (attribute instanceof MemoryAttribute) {
                // change to Disk
                attribute = new DiskAttribute(attribute.getName());
            }
        }
        attribute.setContent(file);
    }

    public void setContent(InputStream inputStream) throws IOException {
        if (attribute instanceof MemoryAttribute) {
            // change to Disk even if we don't know the size
            attribute = new DiskAttribute(attribute.getName());
        }
        attribute.setContent(inputStream);
    }

    public HttpDataType getHttpDataType() {
        return attribute.getHttpDataType();
    }

    public String getName() {
        return attribute.getName();
    }

    public int compareTo(InterfaceHttpData o) {
        return attribute.compareTo(o);
    }

    @Override
    public String toString() {
        return "Mixed: " + attribute.toString();
    }

    public String getValue() throws IOException {
        return attribute.getValue();
    }

    public void setValue(String value) throws IOException {
        attribute.setValue(value);
    }

    public ChannelBuffer getChunk(int length) throws IOException {
        return attribute.getChunk(length);
    }

    public File getFile() throws IOException {
        return attribute.getFile();
    }

}