Java example source code file (MixedAttribute.java)

This example Java source code file (MixedAttribute.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

attribute, bytebuf, charset, diskattribute, file, httpdatatype, illegalargumentexception, ioexception, memoryattribute, mixedattribute, override, size, string

The MixedAttribute.java Java example source code

/*
 * 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 io.netty.handler.codec.http.multipart;

import io.netty.buffer.ByteBuf;
import io.netty.handler.codec.http.HttpConstants;

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

/**
 * 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;
    private long maxSize = DefaultHttpDataFactory.MAXSIZE;

    public MixedAttribute(String name, long limitSize) {
        this(name, limitSize, HttpConstants.DEFAULT_CHARSET);
    }

    public MixedAttribute(String name, long definedSize, long limitSize) {
        this(name, definedSize, limitSize, HttpConstants.DEFAULT_CHARSET);
    }

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

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

    public MixedAttribute(String name, String value, long limitSize) {
        this(name, value, limitSize, HttpConstants.DEFAULT_CHARSET);
    }

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

    @Override
    public long getMaxSize() {
        return maxSize;
    }

    @Override
    public void setMaxSize(long maxSize) {
        this.maxSize = maxSize;
        attribute.setMaxSize(maxSize);
    }

    @Override
    public void checkSize(long newSize) throws IOException {
        if (maxSize >= 0 && newSize > maxSize) {
            throw new IOException("Size exceed allowed maximum capacity");
        }
    }

    @Override
    public void addContent(ByteBuf buffer, boolean last) throws IOException {
        if (attribute instanceof MemoryAttribute) {
            checkSize(attribute.length() + buffer.readableBytes());
            if (attribute.length() + buffer.readableBytes() > limitSize) {
                DiskAttribute diskAttribute = new DiskAttribute(attribute
                        .getName(), attribute.definedLength());
                diskAttribute.setMaxSize(maxSize);
                if (((MemoryAttribute) attribute).getByteBuf() != null) {
                    diskAttribute.addContent(((MemoryAttribute) attribute)
                        .getByteBuf(), false);
                }
                attribute = diskAttribute;
            }
        }
        attribute.addContent(buffer, last);
    }

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

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

    @Override
    public ByteBuf getByteBuf() throws IOException {
        return attribute.getByteBuf();
    }

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

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

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

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

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

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

    @Override
    public long definedLength() {
        return attribute.definedLength();
    }

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

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

    @Override
    public void setContent(ByteBuf buffer) throws IOException {
        checkSize(buffer.readableBytes());
        if (buffer.readableBytes() > limitSize) {
            if (attribute instanceof MemoryAttribute) {
                // change to Disk
                attribute = new DiskAttribute(attribute.getName(), attribute.definedLength());
                attribute.setMaxSize(maxSize);
            }
        }
        attribute.setContent(buffer);
    }

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

    @Override
    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.definedLength());
            attribute.setMaxSize(maxSize);
        }
        attribute.setContent(inputStream);
    }

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

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

    @Override
    public int hashCode() {
        return attribute.hashCode();
    }

    @Override
    public boolean equals(Object obj) {
        return attribute.equals(obj);
    }

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

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

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

    @Override
    public void setValue(String value) throws IOException {
        if (value != null) {
            checkSize(value.getBytes().length);
        }
        attribute.setValue(value);
    }

    @Override
    public ByteBuf getChunk(int length) throws IOException {
        return attribute.getChunk(length);
    }

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

    @Override
    public Attribute copy() {
        return attribute.copy();
    }

    @Override
    public Attribute duplicate() {
        return attribute.duplicate();
    }

    @Override
    public Attribute retainedDuplicate() {
        return attribute.retainedDuplicate();
    }

    @Override
    public Attribute replace(ByteBuf content) {
        return attribute.replace(content);
    }

    @Override
    public ByteBuf content() {
        return attribute.content();
    }

    @Override
    public int refCnt() {
        return attribute.refCnt();
    }

    @Override
    public Attribute retain() {
        attribute.retain();
        return this;
    }

    @Override
    public Attribute retain(int increment) {
        attribute.retain(increment);
        return this;
    }

    @Override
    public Attribute touch() {
        attribute.touch();
        return this;
    }

    @Override
    public Attribute touch(Object hint) {
        attribute.touch(hint);
        return this;
    }

    @Override
    public boolean release() {
        return attribute.release();
    }

    @Override
    public boolean release(int decrement) {
        return attribute.release(decrement);
    }
}