| |
| /* ==================================================================== |
| 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.poifs.dev; |
| |
| import java.io.IOException; |
| import java.io.LineNumberReader; |
| import java.io.StringReader; |
| import java.util.ArrayList; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| /** |
| * This class contains methods used to inspect POIFSViewable objects |
| * |
| * @author Marc Johnson (mjohnson at apache dot org) |
| */ |
| |
| public class POIFSViewEngine |
| { |
| private static final String _EOL = System.getProperty("line.separator"); |
| |
| /** |
| * Inspect an object that may be viewable, and drill down if told |
| * to |
| * |
| * @param viewable the object to be viewed |
| * @param drilldown if true, and the object implements |
| * POIFSViewable, inspect the objects' contents |
| * (recursively) |
| * @param indentLevel how far in to indent each string |
| * @param indentString string to use for indenting |
| * |
| * @return a List of Strings holding the content |
| */ |
| |
| public static List<String> inspectViewable(final Object viewable, |
| final boolean drilldown, |
| final int indentLevel, |
| final String indentString) |
| { |
| List<String> objects = new ArrayList<>(); |
| |
| if (viewable instanceof POIFSViewable) |
| { |
| POIFSViewable inspected = ( POIFSViewable ) viewable; |
| |
| objects.add(indent(indentLevel, indentString, |
| inspected.getShortDescription())); |
| if (drilldown) |
| { |
| if (inspected.preferArray()) |
| { |
| Object[] data = inspected.getViewableArray(); |
| |
| for (int j = 0; j < data.length; j++) |
| { |
| objects.addAll(inspectViewable(data[ j ], drilldown, |
| indentLevel + 1, |
| indentString)); |
| } |
| } |
| else |
| { |
| Iterator<Object> iter = inspected.getViewableIterator(); |
| |
| while (iter.hasNext()) |
| { |
| objects.addAll(inspectViewable(iter.next(), |
| drilldown, |
| indentLevel + 1, |
| indentString)); |
| } |
| } |
| } |
| } |
| else |
| { |
| objects.add(indent(indentLevel, indentString, |
| viewable.toString())); |
| } |
| return objects; |
| } |
| |
| private static String indent(final int indentLevel, |
| final String indentString, final String data) |
| { |
| StringBuilder finalBuffer = new StringBuilder(); |
| StringBuilder indentPrefix = new StringBuilder(); |
| |
| for (int j = 0; j < indentLevel; j++) |
| { |
| indentPrefix.append(indentString); |
| } |
| LineNumberReader reader = |
| new LineNumberReader(new StringReader(data)); |
| |
| try |
| { |
| String line = reader.readLine(); |
| |
| while (line != null) |
| { |
| finalBuffer.append(indentPrefix).append(line).append(_EOL); |
| line = reader.readLine(); |
| } |
| } |
| catch (IOException e) |
| { |
| finalBuffer.append(indentPrefix).append(e.getMessage()) |
| .append(_EOL); |
| } |
| return finalBuffer.toString(); |
| } |
| } // end public class POIFSViewEngine |
| |