org.apache.struts2.tiles.StrutsTilesAnnotationProcessor Maven / Gradle / Ivy
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* to you under the Apache License, Version 2.0 (the
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* http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.struts2.tiles;
import org.apache.commons.lang3.StringUtils;
import org.apache.struts2.tiles.annotation.TilesAddAttribute;
import org.apache.struts2.tiles.annotation.TilesAddListAttribute;
import org.apache.struts2.tiles.annotation.TilesDefinition;
import org.apache.struts2.tiles.annotation.TilesDefinitions;
import org.apache.struts2.tiles.annotation.TilesPutAttribute;
import org.apache.struts2.tiles.annotation.TilesPutListAttribute;
import org.apache.tiles.Attribute;
import org.apache.tiles.Definition;
import org.apache.tiles.Expression;
import org.apache.tiles.ListAttribute;
/**
* Processes tiles annotations to create {@link Definition}s and
* {@link Attribute}s in a way as close to tiles.xml as possible.
*
*/
public class StrutsTilesAnnotationProcessor {
/**
* Search strategy is as follows:
*
* - Check if action has Annotation {@link TilesDefinition}
* - If not, check if action has Annotation {@link TilesDefinitions}
* - If given tileName is not null and present in {@link TilesDefinitions}, return it
* - Return first element of {@link TilesDefinitions}
* - Return null
*
*
* @param action
* Annotated action.
* @param tileName
* Tilename to search for. May be null in some circumstances.
* @return {@link TilesDefinition}
*/
public TilesDefinition findAnnotation(Object action, String tileName) {
Class clazz = action.getClass();
TilesDefinition tilesDefinition = clazz.getAnnotation(TilesDefinition.class);
TilesDefinitions tilesDefinitions = clazz.getAnnotation(TilesDefinitions.class);
if (tilesDefinition == null && tilesDefinitions != null) {
if (!StringUtils.isEmpty(tileName)) {
for (TilesDefinition i : tilesDefinitions.value()) {
if (i.name().equals(tileName)) {
tilesDefinition = i;
break;
}
}
} else {
if (tilesDefinitions.value().length > 0) {
tilesDefinition = tilesDefinitions.value()[0];
}
}
}
return tilesDefinition;
}
/**
* Builds a {@link Definition} based on given {@link TilesDefinition} with
* given name.
*
* @param tileName
* name for resulting {@link Definition}.
* @param tilesDefinition
* {@link TilesDefinition} to process.
* @return {@link Definition} represented by given {@link TilesDefinition}.
*/
public Definition buildTilesDefinition(String tileName, TilesDefinition tilesDefinition) {
Definition definition = new Definition();
definition.setName(tileName);
String extend = getValueOrNull(tilesDefinition.extend());
if (extend != null) {
definition.setExtends(extend);
}
String preparer = getValueOrNull(tilesDefinition.preparer());
if (preparer != null) {
definition.setPreparer(preparer);
}
definition.setTemplateAttribute(buildTemplateAttribute(tilesDefinition));
for (TilesPutAttribute putAttribute : tilesDefinition.putAttributes()) {
Attribute attribute = buildPutAttribute(putAttribute);
definition.putAttribute(putAttribute.name(), attribute, putAttribute.cascade());
}
for (TilesPutListAttribute putListAttribute : tilesDefinition.putListAttributes()) {
Attribute attribute = buildPutListAttribute(putListAttribute);
definition.putAttribute(putListAttribute.name(), attribute, putListAttribute.cascade());
}
return definition;
}
protected Attribute buildTemplateAttribute(TilesDefinition tilesDef) {
// see tiles DigesterDefinitionsReader
Attribute attribute = Attribute.createTemplateAttribute(getValueOrNull(tilesDef.template()));
String templateExpression = getValueOrNull(tilesDef.templateExpression());
Expression expression = Expression.createExpressionFromDescribedExpression(templateExpression);
attribute.setExpressionObject(expression);
attribute.setRole(getValueOrNull(tilesDef.role()));
String templateType = getValueOrNull(tilesDef.templateType());
if (templateType != null) {
attribute.setRenderer(templateType);
} else if (getValueOrNull(tilesDef.extend()) != null && templateType == null) {
attribute.setRenderer(null);
}
return attribute;
}
protected Attribute buildPutAttribute(TilesPutAttribute putAttribute) {
Attribute attribute = new Attribute();
attribute.setValue(getValueOrNull(putAttribute.value()));
String expression = getValueOrNull(putAttribute.expression());
attribute.setExpressionObject(Expression.createExpressionFromDescribedExpression(expression));
attribute.setRole(getValueOrNull(putAttribute.role()));
attribute.setRenderer(getValueOrNull(putAttribute.type()));
return attribute;
}
protected Attribute buildPutListAttribute(TilesPutListAttribute putListAttribute) {
ListAttribute attribute = new ListAttribute();
attribute.setRole(getValueOrNull(putListAttribute.role()));
attribute.setInherit(putListAttribute.inherit());
for (TilesAddAttribute addAttribute : putListAttribute.addAttributes()) {
attribute.add(buildAddAttribute(addAttribute));
}
for (TilesAddListAttribute addListAttribute : putListAttribute.addListAttributes()) {
attribute.add(buildAddListAttribute(addListAttribute));
}
return attribute;
}
protected Attribute buildAddAttribute(TilesAddAttribute addAttribute) {
Attribute attribute = new Attribute();
attribute.setValue(getValueOrNull(addAttribute.value()));
String expression = getValueOrNull(addAttribute.expression());
attribute.setExpressionObject(Expression.createExpressionFromDescribedExpression(expression));
attribute.setRole(getValueOrNull(addAttribute.role()));
attribute.setRenderer(getValueOrNull(addAttribute.type()));
return attribute;
}
protected Attribute buildAddListAttribute(TilesAddListAttribute addListAttribute) {
ListAttribute attribute = new ListAttribute();
attribute.setRole(getValueOrNull(addListAttribute.role()));
for (TilesAddAttribute addAttribute : addListAttribute.addAttributes()) {
attribute.add(buildAddAttribute(addAttribute));
}
return attribute;
}
protected String getValueOrNull(String value) {
return value != null && value.length() > 0 ? value : null;
}
}