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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 org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.handler.codec.http.HttpConstants;

import java.io.IOException;

/**
 * Disk implementation of Attributes
 */
public class DiskAttribute extends AbstractDiskHttpData implements Attribute {
    public static String baseDirectory;

    public static boolean deleteOnExitTemporaryFile = true;

    public static final String prefix = "Attr_";

    public static final String postfix = ".att";

    /**
     * Constructor used for huge Attribute
     */
    public DiskAttribute(String name) {
        super(name, HttpConstants.DEFAULT_CHARSET, 0);
    }
    public DiskAttribute(String name, String value) throws IOException {
        super(name, HttpConstants.DEFAULT_CHARSET, 0); // Attribute have no default size
        setValue(value);
    }

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

    public String getValue() throws IOException {
        byte [] bytes = get();
        return new String(bytes, charset.name());
    }

    public void setValue(String value) throws IOException {
        if (value == null) {
            throw new NullPointerException("value");
        }
        byte [] bytes = value.getBytes(charset.name());
        checkSize(bytes.length);
        ChannelBuffer buffer = ChannelBuffers.wrappedBuffer(bytes);
        if (definedSize > 0) {
            definedSize = buffer.readableBytes();
        }
        setContent(buffer);
    }

    @Override
    public void addContent(ChannelBuffer buffer, boolean last) throws IOException {
        int localsize = buffer.readableBytes();
        checkSize(size + localsize);
        if (definedSize > 0 && definedSize < size + localsize) {
            definedSize = size + localsize;
        }
        super.addContent(buffer, last);
    }
    @Override
    public int hashCode() {
        return getName().hashCode();
    }

    @Override
    public boolean equals(Object o) {
        if (!(o instanceof Attribute)) {
            return false;
        }
        Attribute attribute = (Attribute) o;
        return getName().equalsIgnoreCase(attribute.getName());
    }

    public int compareTo(InterfaceHttpData o) {
        if (!(o instanceof Attribute)) {
            throw new ClassCastException("Cannot compare " + getHttpDataType() +
                    " with " + o.getHttpDataType());
        }
        return compareTo((Attribute) o);
    }

    public int compareTo(Attribute o) {
        return getName().compareToIgnoreCase(o.getName());
    }

    @Override
    public String toString() {
        try {
            return getName() + '=' + getValue();
        } catch (IOException e) {
            return getName() + "=IoException";
        }
    }

    @Override
    protected boolean deleteOnExit() {
        return deleteOnExitTemporaryFile;
    }

    @Override
    protected String getBaseDirectory() {
        return baseDirectory;
    }

    @Override
    protected String getDiskFilename() {
        return getName() + postfix;
    }

    @Override
    protected String getPostfix() {
        return postfix;
    }

    @Override
    protected String getPrefix() {
        return prefix;
    }
}