org.apache.tiles.Attribute Maven / Gradle / Ivy
/*
* $Id: Attribute.java 1035061 2010-11-14 20:32:50Z apetrelli $
*
* 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.tiles;
import static org.apache.tiles.CompareUtil.*;
import java.io.Serializable;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import org.apache.tiles.request.Request;
/**
* Common implementation of attribute definition.
*
* @version $Rev: 1035061 $ $Date: 2010-11-14 15:32:50 -0500 (Sun, 14 Nov 2010) $
*/
public class Attribute implements Serializable, Cloneable {
/**
* The name of the template renderer.
*/
private static final String TEMPLATE_RENDERER = "template";
/**
* The roles that can render this attribute.
* @since 2.0.6
*/
protected Set roles = null;
/**
* The value of the attribute.
*/
protected Object value = null;
/**
* The expression to evaluate. Ignored if {@link #value} is not
* null.
*
* @since 2.2.0
*/
protected Expression expressionObject = null;
/**
* The renderer name of the attribute. Default names are string,
* template, definition, object.
*/
private String renderer = null;
/**
* Constructor.
*
*/
public Attribute() {
}
/**
* Constructor.
*
* @param value Object to store.
*/
public Attribute(Object value) {
this.value = value;
}
/**
* Copy constructor.
*
* @param attribute The attribute to copy from.
*/
public Attribute(Attribute attribute) {
this.roles = attribute.roles;
this.value = attribute.getValue();
if (attribute.expressionObject != null) {
this.expressionObject = new Expression(attribute.expressionObject);
} else {
this.expressionObject = null;
}
this.renderer = attribute.renderer;
}
/**
* Constructor.
*
* @param value Object to store.
* @param role Asociated role.
*/
public Attribute(Object value, String role) {
this.value = value;
setRole(role);
}
/**
* Constructor.
*
* @param value Object to store. If specified, the expression
* parameter will be ignored.
* @param expression The expression to be evaluated. Ignored if the
* value is not null.
* @param role Associated role.
* @param rendererName The renderer name.
* @since 2.2.0
*/
public Attribute(Object value, Expression expression, String role, String rendererName) {
this.value = value;
this.expressionObject = expression;
this.renderer = rendererName;
setRole(role);
}
/**
* Creates a template attribute, starting from the name of the template.
*
* @param template The template that will be rendered.
* @return The template attribute.
* @since 2.1.2
*/
public static Attribute createTemplateAttribute(String template) {
Attribute attribute = new Attribute();
attribute.setValue(template);
attribute.setRenderer(TEMPLATE_RENDERER);
return attribute;
}
/**
* Creates a template attribute, starting from the name of the template.
*
* @param template The template that will be rendered.
* @param templateExpression The template expression that will be evaluated
* to a template.
* @param templateType The type, or renderer, of the template. If null, the
* default template will be used.
* @param role The comma-separated roles for which the template is
* authorized to be rendered.
* @return The template attribute.
* @since 2.2.2
*/
public static Attribute createTemplateAttribute(String template,
String templateExpression, String templateType, String role) {
Attribute templateAttribute = createTemplateAttribute(template);
templateAttribute.setRole(role);
if (templateType != null) {
templateAttribute.setRenderer(templateType);
}
templateAttribute
.setExpressionObject(Expression
.createExpressionFromDescribedExpression(templateExpression));
return templateAttribute;
}
/**
* Creates a template attribute, starting from the expression to evaluate to
* obtain the template.
*
* @param templateExpression The expression to evaluate.
* @return The template attribute.
* @since 2.1.2
*/
public static Attribute createTemplateAttributeWithExpression(
String templateExpression) {
Attribute attribute = new Attribute();
attribute.setExpressionObject(new Expression(templateExpression));
attribute.setRenderer(TEMPLATE_RENDERER);
return attribute;
}
/**
* Get role.
* @return the name of the required role(s)
*/
public String getRole() {
String retValue = null;
if (roles != null && !roles.isEmpty()) {
StringBuilder builder = new StringBuilder();
Iterator roleIt = roles.iterator();
if (roleIt.hasNext()) {
builder.append(roleIt.next());
while (roleIt.hasNext()) {
builder.append(",");
builder.append(roleIt.next());
}
retValue = builder.toString();
}
}
return retValue;
}
/**
* Returns the roles that can render this attribute.
*
* @return The enabled roles.
* @since 2.0.6
*/
public Set getRoles() {
return roles;
}
/**
* Set role.
*
* @param role Associated role.
*/
public void setRole(String role) {
if (role != null && role.trim().length() > 0) {
String[] rolesStrings = role.split("\\s*,\\s*");
roles = new HashSet();
for (int i = 0; i < rolesStrings.length; i++) {
roles.add(rolesStrings[i]);
}
} else {
roles = null;
}
}
/**
* Sets the roles that can render this attribute.
*
* @param roles The enabled roles.
* @since 2.0.6
*/
public void setRoles(Set roles) {
this.roles = roles;
}
/**
* Get value.
* @return the value
*/
public Object getValue() {
return value;
}
/**
* Set value.
*
* @param value New value.
*/
public void setValue(Object value) {
this.value = value;
}
/**
* Returns The expression to evaluate. Ignored if {@link #value} is not
* null.
*
* @return The expression to be evaluated.
* @since 2.2.0
*/
public Expression getExpressionObject() {
return expressionObject;
}
/**
* Sets The expression to evaluate. Ignored if {@link #value} is not
* null.
*
* @param expressionObject The expression to be evaluated.
* @since 2.2.0
*/
public void setExpressionObject(Expression expressionObject) {
this.expressionObject = expressionObject;
}
/** {@inheritDoc} */
@Override
public String toString() {
if (value != null) {
return value.toString();
}
return null;
}
/**
* Returns the renderer name to use.
*
* @return The renderer name.
* @since 2.1.0
*/
public String getRenderer() {
return renderer;
}
/**
* Sets the renderer name to use.
*
* @param rendererName The renderer.
* @since 2.1.0
*/
public void setRenderer(String rendererName) {
this.renderer = rendererName;
}
/**
* Inherits an attribute, i.e. overwrites null properties with the ones
* provided by the attribute.
*
* @param attribute The attribute to inherit.
* @since 2.1.2
*/
public void inherit(Attribute attribute) {
if (value == null) {
value = attribute.getValue();
}
Expression targetExpressionObject = attribute.getExpressionObject();
if (targetExpressionObject != null
&& (expressionObject == null || expressionObject
.getExpression() == null)) {
expressionObject = new Expression(targetExpressionObject);
}
if (roles == null || roles.isEmpty()) {
roles = attribute.getRoles();
}
if (renderer == null) {
renderer = attribute.getRenderer();
}
}
/** {@inheritDoc} */
@Override
public boolean equals(Object obj) {
Attribute attribute = (Attribute) obj;
return nullSafeEquals(value, attribute.value)
&& nullSafeEquals(renderer, attribute.renderer)
&& nullSafeEquals(roles, attribute.roles)
&& nullSafeEquals(expressionObject, attribute.expressionObject);
}
/**
* Checks if the current user can use this attribute.
*
* @param request The request context.
* @return true if the current user can see this attribute.
* @since 3.0.0
*/
public boolean isPermitted(Request request) {
if (roles == null || roles.isEmpty()) {
return true;
}
boolean retValue = false;
for (Iterator roleIt = roles.iterator(); roleIt.hasNext()
&& !retValue;) {
retValue = request.isUserInRole(roleIt.next());
}
return retValue;
}
/** {@inheritDoc} */
@Override
public int hashCode() {
return nullSafeHashCode(value) + nullSafeHashCode(renderer)
+ nullSafeHashCode(roles) + nullSafeHashCode(expressionObject);
}
/** {@inheritDoc} */
@Override
public Attribute clone() {
return new Attribute(this);
}
}
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