Source Code Cross Referenced for DocumentNode.java in  » Collaboration » poi-3.0.2-beta2 » org » apache » poi » poifs » filesystem » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Collaboration » poi 3.0.2 beta2 » org.apache.poi.poifs.filesystem 
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.poi.poifs.filesystem;
019:
020:        import java.util.*;
021:
022:        import org.apache.poi.poifs.dev.POIFSViewable;
023:        import org.apache.poi.poifs.property.DocumentProperty;
024:
025:        /**
026:         * Simple implementation of DocumentEntry
027:         *
028:         * @author Marc Johnson (mjohnson at apache dot org)
029:         */
030:
031:        public class DocumentNode extends EntryNode implements  DocumentEntry,
032:                POIFSViewable {
033:
034:            // underlying POIFSDocument instance
035:            private POIFSDocument _document;
036:
037:            /**
038:             * create a DocumentNode. This method is not public by design; it
039:             * is intended strictly for the internal use of this package
040:             *
041:             * @param property the DocumentProperty for this DocumentEntry
042:             * @param parent the parent of this entry
043:             */
044:
045:            DocumentNode(final DocumentProperty property,
046:                    final DirectoryNode parent) {
047:                super (property, parent);
048:                _document = property.getDocument();
049:            }
050:
051:            /**
052:             * get the POIFSDocument
053:             *
054:             * @return the internal POIFSDocument
055:             */
056:
057:            POIFSDocument getDocument() {
058:                return _document;
059:            }
060:
061:            /* ********** START implementation of DocumentEntry ********** */
062:
063:            /**
064:             * get the zize of the document, in bytes
065:             *
066:             * @return size in bytes
067:             */
068:
069:            public int getSize() {
070:                return getProperty().getSize();
071:            }
072:
073:            /* **********  END  implementation of DocumentEntry ********** */
074:            /* ********** START implementation of Entry ********** */
075:
076:            /**
077:             * is this a DocumentEntry?
078:             *
079:             * @return true if the Entry is a DocumentEntry, else false
080:             */
081:
082:            public boolean isDocumentEntry() {
083:                return true;
084:            }
085:
086:            /* **********  END  implementation of Entry ********** */
087:            /* ********** START extension of Entry ********** */
088:
089:            /**
090:             * extensions use this method to verify internal rules regarding
091:             * deletion of the underlying store.
092:             *
093:             * @return true if it's ok to delete the underlying store, else
094:             *         false
095:             */
096:
097:            protected boolean isDeleteOK() {
098:                return true;
099:            }
100:
101:            /* **********  END  extension of Entry ********** */
102:            /* ********** START begin implementation of POIFSViewable ********** */
103:
104:            /**
105:             * Get an array of objects, some of which may implement
106:             * POIFSViewable
107:             *
108:             * @return an array of Object; may not be null, but may be empty
109:             */
110:
111:            public Object[] getViewableArray() {
112:                return new Object[0];
113:            }
114:
115:            /**
116:             * Get an Iterator of objects, some of which may implement
117:             * POIFSViewable
118:             *
119:             * @return an Iterator; may not be null, but may have an empty
120:             * back end store
121:             */
122:
123:            public Iterator getViewableIterator() {
124:                List components = new ArrayList();
125:
126:                components.add(getProperty());
127:                components.add(_document);
128:                return components.iterator();
129:            }
130:
131:            /**
132:             * Give viewers a hint as to whether to call getViewableArray or
133:             * getViewableIterator
134:             *
135:             * @return true if a viewer should call getViewableArray, false if
136:             *         a viewer should call getViewableIterator
137:             */
138:
139:            public boolean preferArray() {
140:                return false;
141:            }
142:
143:            /**
144:             * Provides a short description of the object, to be used when a
145:             * POIFSViewable object has not provided its contents.
146:             *
147:             * @return short description
148:             */
149:
150:            public String getShortDescription() {
151:                return getName();
152:            }
153:
154:            /* **********  END  begin implementation of POIFSViewable ********** */
155:        } // end public class DocumentNode
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