Source Code Cross Referenced for FileItem.java in  » Sevlet-Container » apache-tomcat-6.0.14 » org » apache » tomcat » util » http » fileupload » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Sevlet Container » apache tomcat 6.0.14 » org.apache.tomcat.util.http.fileupload 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Licensed to the Apache Software Foundation (ASF) under one or more
003:         * contributor license agreements.  See the NOTICE file distributed with
004:         * this work for additional information regarding copyright ownership.
005:         * The ASF licenses this file to You under the Apache License, Version 2.0
006:         * (the "License"); you may not use this file except in compliance with
007:         * the License.  You may obtain a copy of the License at
008:         * 
009:         *      http://www.apache.org/licenses/LICENSE-2.0
010:         * 
011:         * Unless required by applicable law or agreed to in writing, software
012:         * distributed under the License is distributed on an "AS IS" BASIS,
013:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         * See the License for the specific language governing permissions and
015:         * limitations under the License.
016:         */
017:
018:        package org.apache.tomcat.util.http.fileupload;
019:
020:        import java.io.File;
021:        import java.io.IOException;
022:        import java.io.InputStream;
023:        import java.io.OutputStream;
024:        import java.io.Serializable;
025:        import java.io.UnsupportedEncodingException;
026:
027:        /**
028:         * <p> This class represents a file or form item that was received within a
029:         * <code>multipart/form-data</code> POST request.
030:         *
031:         * <p> After retrieving an instance of this class from a {@link
032:         * org.apache.tomcat.util.http.fileupload.FileUpload FileUpload} instance (see
033:         * {@link org.apache.tomcat.util.http.fileupload.FileUpload
034:         * #parseRequest(javax.servlet.http.HttpServletRequest)}), you may
035:         * either request all contents of the file at once using {@link #get()} or
036:         * request an {@link java.io.InputStream InputStream} with
037:         * {@link #getInputStream()} and process the file without attempting to load
038:         * it into memory, which may come handy with large files.
039:         *
040:         * <p> While this interface does not extend
041:         * <code>javax.activation.DataSource</code> per se (to avoid a seldom used
042:         * dependency), several of the defined methods are specifically defined with
043:         * the same signatures as methods in that interface. This allows an
044:         * implementation of this interface to also implement
045:         * <code>javax.activation.DataSource</code> with minimal additional work.
046:         *
047:         * @author <a href="mailto:Rafal.Krzewski@e-point.pl">Rafal Krzewski</a>
048:         * @author <a href="mailto:sean@informage.net">Sean Legassick</a>
049:         * @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a>
050:         * @author <a href="mailto:martinc@apache.org">Martin Cooper</a>
051:         *
052:         * @version $Id: FileItem.java 467222 2006-10-24 03:17:11Z markt $
053:         */
054:        public interface FileItem extends Serializable {
055:
056:            // ------------------------------- Methods from javax.activation.DataSource
057:
058:            /**
059:             * Returns an {@link java.io.InputStream InputStream} that can be
060:             * used to retrieve the contents of the file.
061:             *
062:             * @return An {@link java.io.InputStream InputStream} that can be
063:             *         used to retrieve the contents of the file.
064:             *
065:             * @exception IOException if an error occurs.
066:             */
067:            InputStream getInputStream() throws IOException;
068:
069:            /**
070:             * Returns the content type passed by the browser or <code>null</code> if
071:             * not defined.
072:             *
073:             * @return The content type passed by the browser or <code>null</code> if
074:             *         not defined.
075:             */
076:            String getContentType();
077:
078:            /**
079:             * Returns the original filename in the client's filesystem, as provided by
080:             * the browser (or other client software). In most cases, this will be the
081:             * base file name, without path information. However, some clients, such as
082:             * the Opera browser, do include path information.
083:             *
084:             * @return The original filename in the client's filesystem.
085:             */
086:            String getName();
087:
088:            // ------------------------------------------------------- FileItem methods
089:
090:            /**
091:             * Provides a hint as to whether or not the file contents will be read
092:             * from memory.
093:             *
094:             * @return <code>true</code> if the file contents will be read from memory;
095:             *         <code>false</code> otherwise.
096:             */
097:            boolean isInMemory();
098:
099:            /**
100:             * Returns the size of the file item.
101:             *
102:             * @return The size of the file item, in bytes.
103:             */
104:            long getSize();
105:
106:            /**
107:             * Returns the contents of the file item as an array of bytes.
108:             *
109:             * @return The contents of the file item as an array of bytes.
110:             */
111:            byte[] get();
112:
113:            /**
114:             * Returns the contents of the file item as a String, using the specified
115:             * encoding.  This method uses {@link #get()} to retrieve the
116:             * contents of the item.
117:             *
118:             * @param encoding The character encoding to use.
119:             *
120:             * @return The contents of the item, as a string.
121:             *
122:             * @exception UnsupportedEncodingException if the requested character
123:             *                                         encoding is not available.
124:             */
125:            String getString(String encoding)
126:                    throws UnsupportedEncodingException;
127:
128:            /**
129:             * Returns the contents of the file item as a String, using the default
130:             * character encoding.  This method uses {@link #get()} to retrieve the
131:             * contents of the item.
132:             *
133:             * @return The contents of the item, as a string.
134:             */
135:            String getString();
136:
137:            /**
138:             * A convenience method to write an uploaded item to disk. The client code
139:             * is not concerned with whether or not the item is stored in memory, or on
140:             * disk in a temporary location. They just want to write the uploaded item
141:             * to a file.
142:             * <p>
143:             * This method is not guaranteed to succeed if called more than once for
144:             * the same item. This allows a particular implementation to use, for
145:             * example, file renaming, where possible, rather than copying all of the
146:             * underlying data, thus gaining a significant performance benefit.
147:             *
148:             * @param file The <code>File</code> into which the uploaded item should
149:             *             be stored.
150:             *
151:             * @exception Exception if an error occurs.
152:             */
153:            void write(File file) throws Exception;
154:
155:            /**
156:             * Deletes the underlying storage for a file item, including deleting any
157:             * associated temporary disk file. Although this storage will be deleted
158:             * automatically when the <code>FileItem</code> instance is garbage
159:             * collected, this method can be used to ensure that this is done at an
160:             * earlier time, thus preserving system resources.
161:             */
162:            void delete();
163:
164:            /**
165:             * Returns the name of the field in the multipart form corresponding to
166:             * this file item.
167:             *
168:             * @return The name of the form field.
169:             */
170:            String getFieldName();
171:
172:            /**
173:             * Sets the field name used to reference this file item.
174:             *
175:             * @param name The name of the form field.
176:             */
177:            void setFieldName(String name);
178:
179:            /**
180:             * Determines whether or not a <code>FileItem</code> instance represents
181:             * a simple form field.
182:             *
183:             * @return <code>true</code> if the instance represents a simple form
184:             *         field; <code>false</code> if it represents an uploaded file.
185:             */
186:            boolean isFormField();
187:
188:            /**
189:             * Specifies whether or not a <code>FileItem</code> instance represents
190:             * a simple form field.
191:             *
192:             * @param state <code>true</code> if the instance represents a simple form
193:             *              field; <code>false</code> if it represents an uploaded file.
194:             */
195:            void setFormField(boolean state);
196:
197:            /**
198:             * Returns an {@link java.io.OutputStream OutputStream} that can
199:             * be used for storing the contents of the file.
200:             *
201:             * @return An {@link java.io.OutputStream OutputStream} that can be used
202:             *         for storing the contensts of the file.
203:             *
204:             * @exception IOException if an error occurs.
205:             */
206:            OutputStream getOutputStream() throws IOException;
207:
208:        }
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