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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);
}
}
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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.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 PredicateExample {
List<Person> personList = new ArrayList<Person>();
/**
* Basic method which creates the list of person object's
*
*/
void setUpData() {
personList.add(new Person("ganesh", "gowtham", 25000));
personList.add(new Person("britney", "spears", 45000));
personList.add(new Person("ganesh", "tom", 35000));
personList.add(new Person("sunny", "dummy", 45000));
}
/**
* select's the Person object's from collection of person objects based on arg
* @param propertyName - Person's attribute (firstName (or) lastName (or) salary )
* @param value - Value to be compared to propertyName
*/
void selectObjectsByName(String propertyName, String value) {
EqualPredicate nameEqlPredicate = new EqualPredicate(value);
BeanPredicate beanPredicate = new BeanPredicate(propertyName, nameEqlPredicate);
Collection<Person> filteredCollection = CollectionUtils.select(personList, beanPredicate);
System.out.println("Below are person object(s) whose " + propertyName + " is " + value);
System.out.println("Matches for entered criteria "
+ CollectionUtils.countMatches(personList, beanPredicate));
for (Person person : filteredCollection) {
System.out.println(person);
}
}
/**
* select's the person object from collcetion based on propetyName and value
* @param propertyName - Person's attribute (firstName (or) lastName (or) salary )
* @param value - Value to be compared to propertyName
*/
void selectObjectFromCollection(String propertyName, String value) {
EqualPredicate nameEqlPredicate = new EqualPredicate(value);
BeanPredicate beanPredicate = new BeanPredicate(propertyName, nameEqlPredicate);
System.out.println("Below are person object whose " + propertyName + " is " + value);
System.out.println(CollectionUtils.find(personList, beanPredicate));
}
public static void main(String[] args) {
PredicateExample example = new PredicateExample();
example.setUpData();
example.selectObjectsByName("firstName", "ganesh");
example.selectObjectFromCollection("firstName", "britney");
}
}
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predicate_example2.zip( 811 k)