com.codename1.processing.AttributeEvaluator Maven / Gradle / Ivy
/*
* Copyright (c) 2012, Eric Coolman, Codename One and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Codename One designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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 General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Codename One through http://www.codenameone.com/ if you
* need additional information or have any questions.
*/
package com.codename1.processing;
/**
* Private class, do not use
*
* This evaluator handles expressions that involve an attribute. Examples:
*
*
* Get all players names that are from Canada
*
* /tournament/player[@country='Canada']/name
*
* Get all players names that have a country specified
*
* /tournament/player[@country]/name
*
* Get all players names that don't have a country specified
*
* //player[@country=null]/name
*
* Get the tax charged on all items over $5
*
* //lineitem[@total > 5]/tax
*
* Get the tax charged on all items under $5
*
* //lineitem[@total < 5]/tax
*
*
* @author Eric Coolman
*
*/
class AttributeEvaluator extends AbstractEvaluator {
/**
* Construct with the full predicate expression.
*
* @param expr
*/
protected AttributeEvaluator(String expr) {
super(expr);
}
/* (non-Javadoc)
* @see com.codename1.path.impl.AbstractEvaluator#evaluateSingle(com.codename1.path.impl.StructuredContent, java.lang.String)
*/
protected Object evaluateSingle(StructuredContent element, String expr) {
if (element.getAttribute(expr) != null) {
return element;
}
return super.evaluateSingle(element, expr);
}
/* (non-Javadoc)
* @see com.codename1.path.impl.AbstractEvaluator#evaluateLeftLessRight(com.codename1.path.impl.StructuredContent, java.lang.String, java.lang.String)
*/
protected Object evaluateLeftLessRight(StructuredContent element,
String lvalue, String rvalue) {
lvalue = lvalue.substring(1);
String attr = element.getAttribute(lvalue);
if (attr == null) {
return null;
}
if (isNumeric(rvalue) && isNumeric(attr)) {
int l = Integer.parseInt(attr);
int r = Integer.parseInt(rvalue);
if (l < r) {
return element;
}
return null;
}
rvalue = stripQuotes(rvalue);
if (attr.compareTo(rvalue) > 0) {
return element;
}
return null;
}
/* (non-Javadoc)
* @see com.codename1.path.impl.AbstractEvaluator#evaluateLeftGreaterRight(com.codename1.path.impl.StructuredContent, java.lang.String, java.lang.String)
*/
protected Object evaluateLeftGreaterRight(StructuredContent element,
String lvalue, String rvalue) {
lvalue = lvalue.substring(1);
String attr = element.getAttribute(lvalue);
if (attr == null) {
return null;
}
if (isNumeric(rvalue) && isNumeric(attr)) {
int l = Integer.parseInt(attr);
int r = Integer.parseInt(rvalue);
if (l > r) {
return element;
}
return null;
}
rvalue = stripQuotes(rvalue);
if (attr.compareTo(rvalue) < 0) {
return element;
}
return null;
}
/* (non-Javadoc)
* @see com.codename1.path.impl.AbstractEvaluator#evaluateLeftEqualsRight(com.codename1.path.impl.StructuredContent, java.lang.String, java.lang.String)
*/
protected Object evaluateLeftEqualsRight(StructuredContent element,
String lvalue, String rvalue) {
lvalue = lvalue.substring(1);
String attr = element.getAttribute(lvalue);
if (attr == null) {
return null;
}
if (isNumeric(rvalue) && isNumeric(attr)) {
int l = Integer.parseInt(attr);
int r = Integer.parseInt(rvalue);
if (l == r) {
return element;
}
return null;
}
rvalue = stripQuotes(rvalue);
if (attr.compareTo(rvalue) == 0) {
return element;
}
return null;
}
}