org.tinygroup.weblayer.webcontext.parser.fileupload.TinyFileItem.java Source code

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Here is the source code for org.tinygroup.weblayer.webcontext.parser.fileupload.TinyFileItem.java

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/**
 *  Copyright (c) 1997-2013, www.tinygroup.org (luo_guo@icloud.com).
 *
 *  Licensed under the GPL, Version 3.0 (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.gnu.org/licenses/gpl.html
 *
 *  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.tinygroup.weblayer.webcontext.parser.fileupload;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.io.IOUtils;
import org.tinygroup.commons.tools.StringUtil;

import java.io.*;

/**
 * 
 * : tiny?
 * <p>
    
 * ?: renhui <br>
 * ?: 2014-1-2 <br>
 * <br>
 */
public class TinyFileItem implements FileItem {

    private static final long serialVersionUID = -237775327152222987L;
    /**
     * Default content charset to be used when no explicit charset parameter is
     * provided by the sender. Media subtypes of the "text" type are defined to
     * have a default charset value of "ISO-8859-1" when received via HTTP.
     */
    public static final String DEFAULT_CHARSET = "ISO-8859-1";

    private String fieldName;
    private String contentType;
    private boolean isFormField;
    private String fileName;
    /** Cached contents of the file. */
    private byte[] cachedContent;
    private long size = -1;

    private DeferredByteOutputStream dbos;

    private int sizeThreshold;
    /** ?? */
    private String charset;

    private FileItemStorage storage;
    /**
     * ?,
     */
    private String unique;

    public TinyFileItem(String fieldName, String contentType, boolean isFormField, String fileName,
            FileItemStorage storage) {
        super();
        this.fieldName = fieldName;
        this.contentType = contentType;
        this.isFormField = isFormField;
        this.fileName = fileName;
        this.storage = storage;
    }

    public InputStream getInputStream() throws IOException {
        if (!isInMemory()) {
            return new ByteArrayInputStream(dbos.getFileData());
        }

        if (cachedContent == null) {
            cachedContent = dbos.getMemoryData();
        }
        return new ByteArrayInputStream(cachedContent);

    }

    public String getContentType() {
        return contentType;
    }

    public String getName() {
        return fileName;
    }

    public boolean isInMemory() {
        return isFormField;// ?
    }

    public long getSize() {
        if (size >= 0) {
            return size;
        } else if (cachedContent != null) {
            return cachedContent.length;
        } else if (dbos.isInMemory()) {
            return dbos.getMemoryData().length;
        } else {
            return dbos.getByteCount();
        }

    }

    public byte[] get() {
        if (isInMemory()) {
            if (cachedContent == null) {
                cachedContent = dbos.getMemoryData();
            }
            return cachedContent;
        }
        byte[] fileData = new byte[(int) getSize()];
        ByteArrayInputStream byteInStream = null;
        try {
            byteInStream = new ByteArrayInputStream(dbos.getFileData());
            byteInStream.read(fileData);
        } catch (IOException e) {
            fileData = null;
        } finally {
            if (byteInStream != null) {
                try {
                    byteInStream.close();
                } catch (IOException e) {
                    // ignore
                }
            }
        }
        return fileData;
    }

    public String getString(String encoding) throws UnsupportedEncodingException {
        return new String(get(), encoding);
    }

    public String getString() {
        byte[] rawdata = get();
        String charset = null;
        if (isFormField()) {
            charset = getCharset();
        }
        if (charset == null) {
            charset = DEFAULT_CHARSET;
        }
        try {
            return new String(rawdata, charset);
        } catch (UnsupportedEncodingException e) {
            try {
                return new String(rawdata, DEFAULT_CHARSET);
            } catch (UnsupportedEncodingException ee) {
                return new String(rawdata);
            }
        }
    }

    public void write(File file) throws Exception {
        // 
        if (file != null) {
            file.getParentFile().mkdirs();
        }

        if (isInMemory()) {
            FileOutputStream fout = null;
            try {
                fout = new FileOutputStream(file);
                fout.write(get());
            } finally {
                if (fout != null) {
                    fout.close();
                }
            }
        } else {
            // Save the length of the file
            size = dbos.getByteCount();
            /*
             * The uploaded file is being stored on disk in a temporary location
             * so move it to the desired file.
             */
            BufferedInputStream in = null;
            BufferedOutputStream out = null;
            try {
                in = new BufferedInputStream(new ByteArrayInputStream(dbos.getFileData()));
                out = new BufferedOutputStream(new FileOutputStream(file));
                IOUtils.copy(in, out);
            } finally {
                if (in != null) {
                    try {
                        in.close();
                    } catch (IOException e) {
                        // ignore
                    }
                }
                if (out != null) {
                    try {
                        out.close();
                    } catch (IOException e) {
                        // ignore
                    }
                }
            }
        }
    }

    /**
     * 
     * ?
     */
    public void storage() {
        if (storage != null && !isInMemory()) {
            setUnique(storage.storage(this));
        }
    }

    public void delete() {
        cachedContent = null;
        dbos.clearData();
    }

    public String getFieldName() {
        return fieldName;
    }

    public void setFieldName(String name) {
        this.fieldName = name;
    }

    public boolean isFormField() {
        return isFormField;
    }

    public void setFormField(boolean state) {
        isFormField = state;
    }

    public OutputStream getOutputStream() throws IOException {
        if (dbos == null) {
            if (isFormField()) {
                sizeThreshold = Integer.MAX_VALUE;
            }
            dbos = new DeferredByteOutputStream(sizeThreshold);
        }
        return dbos;
    }

    /** ??field? */
    public String getCharset() {
        return charset;
    }

    /** ?field? */
    public void setCharset(String charset) {
        this.charset = charset;
    }

    public String getUnique() {
        return unique;
    }

    public void setUnique(String unique) {
        this.unique = unique;
    }

    /**
     * Returns a string representation of this object.
     * 
     * @return a string representation of this object.
     */

    public String toString() {
        return StringUtil.defaultIfEmpty(getName(), getString());
    }

}