Java tutorial
/* * gvNIX. Spring Roo based RAD tool for Generalitat Valenciana * Copyright (C) 2013 Generalitat Valenciana * * Licensed 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.gvnix.datatables.tags; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; import javax.servlet.jsp.JspException; import javax.servlet.jsp.PageContext; import javax.servlet.jsp.tagext.Tag; import org.apache.commons.lang3.StringUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.core.convert.ConversionService; import org.springframework.expression.EvaluationContext; import org.springframework.expression.Expression; import org.springframework.expression.ExpressionParser; import org.springframework.expression.spel.standard.SpelExpressionParser; import org.springframework.expression.spel.support.StandardEvaluationContext; import org.springframework.util.ObjectUtils; import com.github.dandelion.datatables.core.configuration.Configuration; import com.github.dandelion.datatables.jsp.tag.ColumnTag; import com.github.dandelion.datatables.jsp.tag.TableTag; /** * Extends the {@link ColumnTag} to make it compatible with the usual roo tag * attributes. This way it may replace the roo column tag just by changing the * xmlns:table reference in the jspx header to the URL of this tag library. * * @author gvNIX Team */ public class RooColumnTag extends ColumnTag { private static final long serialVersionUID = -7713119991577135048L; // Logger @SuppressWarnings("unused") private static final Logger logger = LoggerFactory.getLogger(RooColumnTag.class); /** Max displayed text length (default '-1'). Unlimited if negative. */ private Integer maxLength = Integer.valueOf(-1); /** The column label to be used in the table (optional). */ private String label; /** Indicate that this field is of type {@link Date}. */ private Boolean date = Boolean.FALSE; /** Indicate that this field is of type {@link Calendar}. */ private Boolean calendar = Boolean.FALSE; /** The date / time pattern to use if the field is a date or calendar type. */ private DateFormat dateTimePattern = SimpleDateFormat.getDateTimeInstance(); /** * Indicate if the contents of this tag and all enclosed tags should be * rendered (default 'true') */ private Boolean render = Boolean.TRUE; /** * Used for checking if element has been modified (to recalculate simply * provide empty string value) */ private String z; /** * ConversionService bean name in the Spring application context. It is used * to convert the property value to String. (default * 'applicationConversionService'). */ private String conversionServiceId = "applicationConversionService"; private final SpringContextHelper helper = new SpringContextHelper(); private static final String SEPARATOR_FIELDS = "."; private static final String SEPARATOR_FIELDS_ESCAPED = "_~~_"; private boolean doRender() { return Boolean.TRUE.equals(render) || render == null; } public int doStartTag() throws JspException { TableTag parent = (TableTag) findAncestorWithClass(this, TableTag.class); if (!doRender()) { return SKIP_BODY; } doInitialization(); if ("AJAX".equals(parent.getLoadingType())) { return SKIP_BODY; } return super.doStartTag(); } private void doInitialization() throws JspException { // Parent tag uses the 'title' attribute as the column title // Get the label value like the current line in the roo tag files: // <spring:message // code="label_${fn:toLowerCase(fn:substringAfter(id,'_'))}" var="label" // htmlEscape="false" /> String label = getLabel(); if (StringUtils.isEmpty(getTitle())) { if (StringUtils.isEmpty(label)) { String id = getId(); String code = "label".concat(id.substring(id.indexOf('_')).toLowerCase()); label = helper.resolveMessage(this.pageContext, code); } setTitle(label); } // Remove configuration of the property "sortInit" if it's empty. if (StringUtils.isBlank((String) stagingConf.get(Configuration.COLUMN_SORTINIT))) { stagingConf.remove(Configuration.COLUMN_SORTINIT); } // Remove configuration of the property "sortDirection" if it's empty. if (StringUtils.isBlank((String) stagingConf.get(Configuration.COLUMN_SORTDIRECTION))) { stagingConf.remove(Configuration.COLUMN_SORTDIRECTION); } } @Override protected String getColumnContent() throws JspException { // Try to do the same as the roo table.tagx tag to get the value for the // column // <c:choose> // <c:when test="${columnType eq 'date'}"> // <spring:escapeBody> // <fmt:formatDate value="${item[column]}" // pattern="${fn:escapeXml(columnDatePattern)}" var="colTxt" /> // </spring:escapeBody> // </c:when> // <c:when test="${columnType eq 'calendar'}"> // <spring:escapeBody> // <fmt:formatDate value="${item[column].time}" // pattern="${fn:escapeXml(columnDatePattern)}" var="colTxt"/> // </spring:escapeBody> // </c:when> // <c:otherwise> // <c:set var="colTxt"> // <spring:eval expression="item[column]" htmlEscape="false" /> // </c:set> // </c:otherwise> // </c:choose> // <c:if test="${columnMaxLength ge 0}"> // <c:set value="${fn:substring(colTxt, 0, columnMaxLength)}" // var="colTxt" /> // </c:if> // <c:out value="${colTxt}" /> // TODO log problem resolving column content if (StringUtils.isBlank(this.property)) { return ""; } TableTag parent = (TableTag) getParent(); ExpressionParser parser = new SpelExpressionParser(); String unescapedProperty = this.property.replace(SEPARATOR_FIELDS_ESCAPED, SEPARATOR_FIELDS); Expression exp = parser.parseExpression(unescapedProperty); EvaluationContext context = new StandardEvaluationContext(parent.getCurrentObject()); Object value = exp.getValue(context); String result = ""; if (value != null) { if (Date.class.isAssignableFrom(value.getClass())) { result = dateTimePattern.format(value); } else if (value instanceof Calendar) { result = dateTimePattern.format(((Calendar) value).getTime()); } else { ConversionService conversionService = (ConversionService) helper.getBean(this.pageContext, getConversionServiceId()); if (conversionService != null && conversionService.canConvert(value.getClass(), String.class)) { result = conversionService.convert(value, String.class); } else { result = ObjectUtils.getDisplayString(value); } // result = (isHtmlEscape() ? HtmlUtils.htmlEscape(result) : // result); // result = (this.javaScriptEscape ? // JavaScriptUtils.javaScriptEscape(result) : result); } } else { result = super.getColumnContent(); } if (maxLength >= 0 && result.length() > maxLength) { result = result.substring(0, maxLength); } return result; } @Override public int doEndTag() throws JspException { if (!doRender()) { return EVAL_PAGE; } return super.doEndTag(); } @Override public int doAfterBody() throws JspException { if (!doRender()) { return SKIP_BODY; } return super.doAfterBody(); } public Integer getMaxLength() { return maxLength; } public void setMaxLength(Integer maxLength) { this.maxLength = maxLength; } public String getLabel() { return label; } public void setLabel(String label) { this.label = label; } public Boolean getDate() { return date; } public void setDate(Boolean date) { this.date = date; } public Boolean getCalendar() { return calendar; } public void setCalendar(Boolean calendar) { this.calendar = calendar; } public String getDateTimePattern() { return dateTimePattern.toString(); } public void setDateTimePattern(String dateTimePattern) { if (StringUtils.isBlank(dateTimePattern)) { this.dateTimePattern = SimpleDateFormat.getDateInstance(); return; } this.dateTimePattern = new SimpleDateFormat(dateTimePattern, helper.getRequestLocale(this.pageContext)); } public Boolean getRender() { return render; } public void setRender(Boolean render) { this.render = render; } public String getZ() { return z; } public void setZ(String z) { this.z = z; } public String getConversionServiceId() { return conversionServiceId; } public void setConversionServiceId(String conversionServiceId) { this.conversionServiceId = conversionServiceId; } /** * TBC * * @param tag * @param pageContext * @return */ public Tag getParent() { // If not found so we try to find in page context. Note RooTableTag // must add the reference to itself in doStartTag() method Tag parent = (Tag) pageContext.getAttribute(RooTableTag.TABLE_TAG_VARIABLE, PageContext.REQUEST_SCOPE); if (parent != null) { return parent; } return super.getParent(); } }