Java tutorial
/** * Copyright (c) 2000-present Liferay, Inc. All rights reserved. * * This library is free software; you can redistribute it and/or modify it under * the terms of the GNU Lesser General Public License as published by the Free * Software Foundation; either version 2.1 of the License, or (at your option) * any later version. * * This library is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more * details. */ package com.liferay.document.library.web.internal.portlet.action; import com.liferay.document.library.kernel.exception.NoSuchFileEntryException; import com.liferay.document.library.kernel.service.DLAppLocalService; import com.liferay.document.library.kernel.service.DLAppService; import com.liferay.document.library.kernel.util.DLUtil; import com.liferay.document.library.web.constants.DLPortletKeys; import com.liferay.portal.kernel.diff.DiffResult; import com.liferay.portal.kernel.diff.DiffUtil; import com.liferay.portal.kernel.io.unsync.UnsyncByteArrayInputStream; import com.liferay.portal.kernel.portlet.bridges.mvc.MVCRenderCommand; import com.liferay.portal.kernel.repository.model.FileVersion; import com.liferay.portal.kernel.security.auth.PrincipalException; import com.liferay.portal.kernel.servlet.SessionErrors; import com.liferay.portal.kernel.util.HtmlUtil; import com.liferay.portal.kernel.util.ParamUtil; import com.liferay.portal.kernel.util.StringPool; import com.liferay.portal.kernel.util.StringUtil; import com.liferay.portal.kernel.util.WebKeys; import com.liferay.portlet.documentlibrary.util.DocumentConversionUtil; import java.io.FileInputStream; import java.io.InputStream; import java.io.InputStreamReader; import java.util.List; import javax.portlet.PortletException; import javax.portlet.RenderRequest; import javax.portlet.RenderResponse; import org.osgi.service.component.annotations.Component; import org.osgi.service.component.annotations.Reference; /** * @author Bruno Farache */ @Component(property = { "javax.portlet.name=" + DLPortletKeys.DOCUMENT_LIBRARY, "javax.portlet.name=" + DLPortletKeys.DOCUMENT_LIBRARY_ADMIN, "javax.portlet.name=" + DLPortletKeys.MEDIA_GALLERY_DISPLAY, "mvc.command.name=/document_library/compare_versions" }, service = MVCRenderCommand.class) public class CompareVersionsMVCRenderCommand implements MVCRenderCommand { @Override public String render(RenderRequest renderRequest, RenderResponse renderResponse) throws PortletException { try { compareVersions(renderRequest); } catch (Exception e) { if (e instanceof NoSuchFileEntryException || e instanceof PrincipalException) { SessionErrors.add(renderRequest, e.getClass()); return "/document_library/error.jsp"; } else { throw new PortletException(e); } } return "/document_library/compare_versions.jsp"; } protected void compareVersions(RenderRequest renderRequest) throws Exception { long sourceFileVersionId = ParamUtil.getLong(renderRequest, "sourceFileVersionId"); long targetFileVersionId = ParamUtil.getLong(renderRequest, "targetFileVersionId"); FileVersion sourceFileVersion = _dlAppService.getFileVersion(sourceFileVersionId); InputStream sourceIs = sourceFileVersion.getContentStream(false); String sourceExtension = sourceFileVersion.getExtension(); if (sourceExtension.equals("css") || sourceExtension.equals("htm") || sourceExtension.equals("html") || sourceExtension.equals("js") || sourceExtension.equals("txt") || sourceExtension.equals("xml")) { String sourceContent = HtmlUtil.escape(StringUtil.read(sourceIs)); sourceIs = new UnsyncByteArrayInputStream(sourceContent.getBytes(StringPool.UTF8)); } FileVersion targetFileVersion = _dlAppLocalService.getFileVersion(targetFileVersionId); InputStream targetIs = targetFileVersion.getContentStream(false); String targetExtension = targetFileVersion.getExtension(); if (targetExtension.equals("css") || targetExtension.equals("htm") || targetExtension.equals("html") || targetExtension.equals("js") || targetExtension.equals("txt") || targetExtension.equals("xml")) { String targetContent = HtmlUtil.escape(StringUtil.read(targetIs)); targetIs = new UnsyncByteArrayInputStream(targetContent.getBytes(StringPool.UTF8)); } if (DocumentConversionUtil.isEnabled()) { if (DocumentConversionUtil.isConvertBeforeCompare(sourceExtension)) { String sourceTempFileId = DLUtil.getTempFileId(sourceFileVersion.getFileEntryId(), sourceFileVersion.getVersion()); sourceIs = new FileInputStream( DocumentConversionUtil.convert(sourceTempFileId, sourceIs, sourceExtension, "txt")); } if (DocumentConversionUtil.isConvertBeforeCompare(targetExtension)) { String targetTempFileId = DLUtil.getTempFileId(targetFileVersion.getFileEntryId(), targetFileVersion.getVersion()); targetIs = new FileInputStream( DocumentConversionUtil.convert(targetTempFileId, targetIs, targetExtension, "txt")); } } List<DiffResult>[] diffResults = DiffUtil.diff(new InputStreamReader(sourceIs), new InputStreamReader(targetIs)); renderRequest.setAttribute(WebKeys.DIFF_RESULTS, diffResults); renderRequest.setAttribute(WebKeys.SOURCE_NAME, sourceFileVersion.getTitle() + StringPool.SPACE + sourceFileVersion.getVersion()); renderRequest.setAttribute(WebKeys.TARGET_NAME, targetFileVersion.getTitle() + StringPool.SPACE + targetFileVersion.getVersion()); } @Reference(unbind = "-") protected void setDLAppLocalService(DLAppLocalService dlAppLocalService) { _dlAppLocalService = dlAppLocalService; } @Reference(unbind = "-") protected void setDLAppService(DLAppService dlAppService) { _dlAppService = dlAppService; } private DLAppLocalService _dlAppLocalService; private DLAppService _dlAppService; }