105 lines
3.2 KiB
Java
105 lines
3.2 KiB
Java
/* ====================================================================
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==================================================================== */
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package org.apache.poi.hpbf.model;
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import java.io.ByteArrayInputStream;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import org.apache.poi.poifs.filesystem.DirectoryNode;
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import org.apache.poi.poifs.filesystem.DocumentEntry;
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/**
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* Parent class of all HPBF sub-parts, handling
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* the fiddly reading in / writing out bits
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* for all of them.
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*/
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public abstract class HPBFPart {
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protected byte[] data;
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/**
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* @param path the path to the part, eg Contents or Quill, QuillSub, CONTENTS
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*/
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public HPBFPart(DirectoryNode baseDir, String[] path) throws IOException {
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DirectoryNode dir = getDir(path, baseDir);
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String name = path[path.length-1];
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DocumentEntry docProps;
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try {
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docProps = (DocumentEntry)dir.getEntry(name);
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} catch (FileNotFoundException e) {
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throw new IllegalArgumentException("File invalid - failed to find document entry '"
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+ name + "'");
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}
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// Grab the data from the part stream
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data = new byte[docProps.getSize()];
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dir.createDocumentInputStream(name).read(data);
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}
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private DirectoryNode getDir(String[] path, DirectoryNode baseDir) {
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DirectoryNode dir = baseDir;
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for(int i=0; i<path.length-1; i++) {
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try {
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dir = (DirectoryNode)dir.getEntry(path[i]);
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} catch (FileNotFoundException e) {
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throw new IllegalArgumentException("File invalid - failed to find directory entry '"
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+ path[i] + "'");
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}
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}
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return dir;
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}
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public void writeOut(DirectoryNode baseDir) throws IOException {
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String[] path = getPath();
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// Ensure that all parent directories exist
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DirectoryNode dir = baseDir;
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for(int i=0; i<path.length-1; i++) {
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try {
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dir = (DirectoryNode)dir.getEntry(path[i]);
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} catch(FileNotFoundException e) {
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dir.createDirectory(path[i]);
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}
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}
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// Update the byte array with the latest data
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generateData();
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// Write out
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ByteArrayInputStream bais = new ByteArrayInputStream(data);
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dir.createDocument(path[path.length-1], bais);
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}
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/**
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* Called just before writing out, to trigger
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* the data byte array to be updated with the
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* latest contents.
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*/
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protected abstract void generateData();
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/**
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* Returns the raw data that makes up
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* this document part.
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*/
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public byte[] getData() { return data; }
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/**
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* Returns
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*/
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public final String[] getPath() {return null;}
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}
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