org.primefaces.model.BeanPropertyComparator Maven / Gradle / Ivy
/*
* Copyright 2009-2014 PrimeTek.
*
* 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.primefaces.model;
import java.text.Collator;
import java.util.Comparator;
import java.util.Locale;
import javax.el.MethodExpression;
import javax.el.ValueExpression;
import javax.faces.FacesException;
import javax.faces.context.FacesContext;
/**
* Generic comparator for column sorting.
*/
public class BeanPropertyComparator implements Comparator {
private ValueExpression sortBy;
private boolean asc;
private String var;
private MethodExpression sortFunction;
private boolean caseSensitive = false;
private Locale locale;
private Collator collator;
private int nullSortOrder;
public BeanPropertyComparator(ValueExpression sortBy, String var, SortOrder sortOrder, MethodExpression sortFunction, boolean caseSensitive, Locale locale, int nullSortOrder) {
this.sortBy = sortBy;
this.var = var;
this.asc = sortOrder.equals(SortOrder.ASCENDING);
this.sortFunction = sortFunction;
this.caseSensitive = caseSensitive;
this.locale = locale;
this.collator = Collator.getInstance(locale);
this.nullSortOrder = nullSortOrder;
}
@SuppressWarnings("unchecked")
public int compare(Object obj1, Object obj2) {
try {
FacesContext context = FacesContext.getCurrentInstance();
context.getExternalContext().getRequestMap().put(var, obj1);
Object value1 = sortBy.getValue(context.getELContext());
context.getExternalContext().getRequestMap().put(var, obj2);
Object value2 = sortBy.getValue(context.getELContext());
int result;
//Empty check
if (value1 == null && value2 == null) {
return 0;
} else if (value1 == null) {
result = 1 * nullSortOrder;
} else if (value2 == null) {
result = -1 * nullSortOrder;
} else if (sortFunction == null) {
if(value1 instanceof String && value2 instanceof String) {
if(this.caseSensitive) {
result = collator.compare(value1, value2);
}
else {
String str1 = (((String) value1).toLowerCase(locale));
String str2 = (((String) value2).toLowerCase(locale));
result = collator.compare(str1, str2);
}
} else {
result = ((Comparable) value1).compareTo(value2);
}
} else {
result = (Integer) sortFunction.invoke(context.getELContext(), new Object[]{value1, value2});
}
return asc ? result : -1 * result;
} catch (Exception e) {
throw new FacesException(e);
}
}
}