hpsfpropertiesextractor.java

来自「EXCEL read and write」· Java 代码 · 共 152 行

/* ====================================================================
   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF 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 org.apache.poi.hpsf.extractor;

import java.io.IOException;
import java.io.OutputStream;
import java.util.Iterator;

import org.apache.poi.POIDocument;
import org.apache.poi.POITextExtractor;
import org.apache.poi.hpsf.CustomProperties;
import org.apache.poi.hpsf.DocumentSummaryInformation;
import org.apache.poi.hpsf.Property;
import org.apache.poi.hpsf.SpecialPropertySet;
import org.apache.poi.hpsf.SummaryInformation;
import org.apache.poi.hpsf.wellknown.PropertyIDMap;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.util.LittleEndian;

/**
 * Extracts all of the HPSF properties, both
 *  build in and custom, returning them in 
 *  textual form.
 */
public class HPSFPropertiesExtractor extends POITextExtractor {
	public HPSFPropertiesExtractor(POITextExtractor mainExtractor) {
		super(mainExtractor);
	}
	public HPSFPropertiesExtractor(POIDocument doc) {
		super(doc);
	}
	public HPSFPropertiesExtractor(POIFSFileSystem fs) {
		super(new PropertiesOnlyDocument(fs));
	}
	
	public String getDocumentSummaryInformationText() {
		DocumentSummaryInformation dsi = document.getDocumentSummaryInformation();
		StringBuffer text = new StringBuffer();

		// Normal properties
		text.append( getPropertiesText(dsi) );
		
		// Now custom ones
		CustomProperties cps = dsi.getCustomProperties();
		Iterator keys = cps.keySet().iterator();
		while(keys.hasNext()) {
			String key = (String)keys.next();
			String val = getPropertyValueText( cps.get(key) );
			text.append(key + " = " + val + "\n");
		}
		
		// All done
		return text.toString();
	}
	public String getSummaryInformationText() {
		SummaryInformation si = document.getSummaryInformation();
		
		// Just normal properties
		return getPropertiesText(si);
	}
	
	private static String getPropertiesText(SpecialPropertySet ps) {
		if(ps == null) {
			// Not defined, oh well
			return "";
		}
		
		StringBuffer text = new StringBuffer();
		
		PropertyIDMap idMap = ps.getPropertySetIDMap();
		Property[] props = ps.getProperties();
		for(int i=0; i<props.length; i++) {
			String type = Long.toString( props[i].getID() ); 
			Object typeObj = idMap.get(props[i].getID());
			if(typeObj != null) {
				type = typeObj.toString();
			}
			
			String val = getPropertyValueText( props[i].getValue() );
			text.append(type + " = " + val + "\n");
		}
		
		return text.toString();
	}
	private static String getPropertyValueText(Object val) {
		if(val == null) {
			return "(not set)";
		}
		if(val instanceof byte[]) {
			byte[] b = (byte[])val;
			if(b.length == 0) {
				return "";
			}
			if(b.length == 1) {
				return Byte.toString(b[0]);
			}
			if(b.length == 2) {
				return Integer.toString( LittleEndian.getUShort(b) );
			}
			if(b.length == 4) {
				return Long.toString( LittleEndian.getUInt(b) );
			}
			// Maybe it's a string? who knows!
			return new String(b);
		}
		return val.toString();
	}

	/**
	 * Return the text of all the properties defined in
	 *  the document.
	 */
	public String getText() {
		return getSummaryInformationText() + getDocumentSummaryInformationText();
	}
	
	/**
	 * Prevent recursion!
	 */
	public POITextExtractor getMetadataTextExtractor() {
		throw new IllegalStateException("You already have the Metadata Text Extractor, not recursing!");
	}

	/**
	 * So we can get at the properties of any 
	 *  random OLE2 document.
	 */
	private static class PropertiesOnlyDocument extends POIDocument {
		private PropertiesOnlyDocument(POIFSFileSystem fs) {
			super(fs);
		}

		public void write(OutputStream out) throws IOException {
			throw new IllegalStateException("Unable to write, only for properties!");
		}
	}
}