Java tutorial
package com.googelcode.jpractices.common; import org.apache.commons.lang.builder.ToStringBuilder; /** * Copyright 2009 @ jPractices v 1.0 * @SVN URL : http://jpractices.googlecode.com * @author Ganesh Gowtham * @Homepage : http://ganesh.gowtham.googlepages.com */ public class Person { private String firstName; private String lastName; private int salary; public Person(String firstName, String lastName, int salary) { super(); this.firstName = firstName; this.lastName = lastName; this.salary = salary; } public String getFirstName() { return firstName; } public void setFirstName(String firstName) { this.firstName = firstName; } public String getLastName() { return lastName; } public void setLastName(String lastName) { this.lastName = lastName; } public int getSalary() { return salary; } public void setSalary(int salary) { this.salary = salary; } @Override public String toString() { return ToStringBuilder.reflectionToString(this); } }---------------package com.googelcode.jpractices; import java.util.ArrayList; import java.util.Collection; import java.util.List; import org.apache.commons.beanutils.BeanPredicate; import org.apache.commons.collections.CollectionUtils; import org.apache.commons.collections.Predicate; import org.apache.commons.collections.PredicateUtils; import org.apache.commons.collections.functors.EqualPredicate; import com.googelcode.jpractices.common.Person; /** * Copyright 2009 @ jPractices v 1.0 * @SVN URL : http://jpractices.googlecode.com * @author Ganesh Gowtham * @Homepage : http://ganesh.gowtham.googlepages.com */ public class PredicateChainExample { List<Person> personList = new ArrayList<Person>(); /** * Basic method which creates the list of person object's * */ void setUpData() { personList.add(new Person("ganesh", "gowtham", 35000)); personList.add(new Person("britney", "spears", 45000)); personList.add(new Person("ganesh", "gowtham", 36000)); personList.add(new Person("ganesh", "dummy", 45000)); } /** * * Here we are adding multiple predicate * filters the collection so that final person object will contain * firstName as "ganesh" & lastName as "gowtham" */ void filterDataUsingMultipleCriteria() { EqualPredicate firstNameEqlPredicate = new EqualPredicate("ganesh"); BeanPredicate firtsNameBeanPredicate = new BeanPredicate("firstName", firstNameEqlPredicate); EqualPredicate lastNameEqlPredicate2 = new EqualPredicate("gowtham"); BeanPredicate lastNameBeanPredicate2 = new BeanPredicate("lastName", lastNameEqlPredicate2); Predicate[] allPredicateArray = { firtsNameBeanPredicate, lastNameBeanPredicate2 }; Predicate allPredicate = PredicateUtils.allPredicate(allPredicateArray); Collection<Person> filteredCollection = CollectionUtils.select(personList, allPredicate); for (Person person : filteredCollection) { System.out.println(person); } } public static void main(String[] args) { PredicateChainExample chainExample = new PredicateChainExample(); chainExample.setUpData(); chainExample.filterDataUsingMultipleCriteria(); } }