| /************************************************************** |
| * |
| * 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.openoffice.xmerge.merger.merge; |
| |
| import org.w3c.dom.Node; |
| import org.w3c.dom.Element; |
| import org.w3c.dom.NodeList; |
| import org.w3c.dom.NamedNodeMap; |
| |
| import org.openoffice.xmerge.ConverterCapabilities; |
| import org.openoffice.xmerge.merger.Iterator; |
| import org.openoffice.xmerge.merger.NodeMergeAlgorithm; |
| import org.openoffice.xmerge.merger.diff.CellNodeIterator; |
| import org.openoffice.xmerge.converter.xml.OfficeConstants; |
| import org.openoffice.xmerge.util.XmlUtil; |
| |
| |
| /** |
| * This is an implementation of the <code>NodeMergeAlgorithm</code> |
| * interface. It is used to merge two rows using a positional |
| * comparison base method. |
| */ |
| public final class PositionBaseRowMerge implements NodeMergeAlgorithm { |
| |
| /** The capabilities of this converter. */ |
| private ConverterCapabilities cc_; |
| |
| |
| /** |
| * Constructor. |
| * |
| * @param cc The <code>ConverterCapabilities</code>. |
| */ |
| public PositionBaseRowMerge(ConverterCapabilities cc) { |
| cc_ = cc; |
| } |
| |
| |
| public void merge(Node orgRow, Node modRow) { |
| |
| Iterator orgCells = new CellNodeIterator(cc_, orgRow); |
| Iterator modCells = new CellNodeIterator(cc_, modRow); |
| |
| mergeCellSequences(orgCells, modCells); |
| } |
| |
| |
| // used to compare the cell 1 by 1 |
| private void mergeCellSequences(Iterator orgSeq, Iterator modSeq) { |
| |
| boolean needMerge = true; |
| Element orgCell, modCell; |
| |
| Object orgSeqObject = orgSeq.start(); |
| Object modSeqObject = modSeq.start(); |
| |
| while (orgSeqObject != null) { |
| |
| |
| needMerge = true; |
| |
| if (modSeqObject == null) { |
| // no corresponding cell in the target, empty out the cell |
| SheetUtil.emptyCell(cc_, (Node)orgSeqObject); |
| orgSeqObject = orgSeq.next(); |
| |
| } else { |
| |
| // compare the cell directly |
| if (!orgSeq.equivalent(orgSeqObject, modSeqObject)) { |
| |
| orgCell = (Element)orgSeqObject; |
| modCell = (Element)modSeqObject; |
| |
| // check whether the original cell with multiple column |
| // if so, need to split one out for merge |
| String orgColRepeated = orgCell.getAttribute( |
| OfficeConstants.ATTRIBUTE_TABLE_NUM_COLUMNS_REPEATED); |
| String modColRepeated = modCell.getAttribute( |
| OfficeConstants.ATTRIBUTE_TABLE_NUM_COLUMNS_REPEATED); |
| |
| int orgColNum = 1; |
| int modColNum = 1; |
| |
| if (orgColRepeated.length() > 0) { |
| orgColNum = |
| Integer.valueOf(orgColRepeated).intValue(); |
| } |
| if (modColRepeated.length() > 0) { |
| modColNum = |
| Integer.valueOf(modColRepeated).intValue(); |
| } |
| |
| // try to find out the common number of repeated cols |
| if (orgColNum == modColNum) { |
| orgSeqObject = orgSeq.next(); |
| modSeqObject = modSeq.next(); |
| |
| // cut the original cell into 2 half, first half |
| // have the repeated attribute = modify cell attr |
| } else if (orgColNum > modColNum) { |
| Element orgSplitCell = splitColRepeatedCell( |
| orgCell, modColNum, |
| orgColNum - modColNum); |
| // it may equal after the split! |
| if (orgSeq.equivalent(orgSplitCell, modCell)) { |
| needMerge = false; |
| } |
| orgCell = orgSplitCell; |
| modSeqObject = modSeq.next(); |
| |
| // cut the modified cell into 2 half, first half |
| // have the repeated attribute = original cell attr |
| } else { |
| Element modSplitCell = splitColRepeatedCell( |
| modCell, orgColNum, |
| modColNum - orgColNum); |
| // it may equal after the split! |
| if (modSeq.equivalent(orgCell, modSplitCell)) { |
| needMerge = false; |
| } |
| modCell = modSplitCell; |
| orgSeqObject = orgSeq.next(); |
| } |
| |
| if (needMerge) { |
| mergeCells(orgCell, modCell); |
| } |
| |
| } else { |
| // cells are equivalent, move on to next one. |
| orgSeqObject = orgSeq.next(); |
| modSeqObject = modSeq.next(); |
| } // end if-else |
| } // end if-else |
| } // end while loop |
| |
| // get the one of the original cell, so that the cloned node |
| // can base it to find the document node |
| orgCell = (Element)orgSeq.start(); |
| |
| // add any extra cells to the original cell sequence. |
| for (; modSeqObject != null; modSeqObject = modSeq.next()) { |
| Node clonedNode = XmlUtil.deepClone(orgCell, (Node)modSeqObject); |
| Node parent = orgCell.getParentNode(); |
| parent.appendChild(clonedNode); |
| } |
| } |
| |
| |
| private Element splitColRepeatedCell(Element orgCell, |
| int splitNum, int orgNum) { |
| // NOTE: should we really want to do deep clone? |
| // in most the case, it is an empty cell, but the |
| // specification didn't forbid any node to use multiple |
| // column attributes. i.e. the node can contain text |
| // nodes or other things under it. |
| Element splitCell = (Element)(orgCell.cloneNode(true)); |
| |
| if (splitNum > 1) { |
| splitCell.setAttribute( |
| OfficeConstants.ATTRIBUTE_TABLE_NUM_COLUMNS_REPEATED, |
| String.valueOf(splitNum)); |
| } else if (splitNum == 1) { |
| splitCell.removeAttribute( |
| OfficeConstants.ATTRIBUTE_TABLE_NUM_COLUMNS_REPEATED); |
| } |
| if (orgNum > 1) { |
| orgCell.setAttribute( |
| OfficeConstants.ATTRIBUTE_TABLE_NUM_COLUMNS_REPEATED, |
| String.valueOf(orgNum)); |
| } else if (orgNum == 1) { |
| orgCell.removeAttribute( |
| OfficeConstants.ATTRIBUTE_TABLE_NUM_COLUMNS_REPEATED); |
| } |
| |
| Node parentNode = orgCell.getParentNode(); |
| parentNode.insertBefore(splitCell, orgCell); |
| |
| return splitCell; |
| } |
| |
| |
| private void mergeCells(Element orgCell, Element modCell) { |
| |
| // remove all the supported attributes and possible text child for |
| // string cells |
| SheetUtil.emptyCell(cc_, orgCell); |
| |
| // copy all the supported attributes and possible text child from |
| // the modified cell |
| NamedNodeMap attrNodes = modCell.getAttributes(); |
| |
| if (attrNodes != null) { |
| |
| // copy the first text:p node. As it's not necessary only string |
| // type cell can have a text:p section. |
| NodeList paraNodes = |
| modCell.getElementsByTagName(OfficeConstants.TAG_PARAGRAPH); |
| |
| Node firstParaNode = paraNodes.item(0); |
| |
| // try to clone the node |
| if (firstParaNode != null) { |
| |
| Node clonedNode = XmlUtil.deepClone(orgCell, firstParaNode); |
| |
| // insert as the first child of the original cell |
| Node firstChild = orgCell.getFirstChild(); |
| if (firstChild != null) { |
| orgCell.insertBefore(clonedNode, firstChild); |
| } else { |
| orgCell.appendChild(clonedNode); |
| } |
| } |
| |
| // check all the attributes and copy those we supported in |
| // converter |
| // NOTE: for attribute list, refer to section 4.7.2 in specification |
| int len = attrNodes.getLength(); |
| |
| for (int i = 0; i < len; i++) { |
| Node attr = attrNodes.item(i); |
| |
| // copy the supported attrs |
| if (cc_.canConvertAttribute(OfficeConstants.TAG_TABLE_CELL, |
| attr.getNodeName())) { |
| orgCell.setAttribute(attr.getNodeName(), |
| attr.getNodeValue()); |
| } |
| } |
| } |
| } |
| } |
| |
