com.nwea.samples.apachecommons.collections.SampleCollectionUtils.java Source code

Introduction

Here is the source code for com.nwea.samples.apachecommons.collections.SampleCollectionUtils.java

Source

/**
 *******************************************************************************
 * Licensed Materials - Property of NWEA *
 *  Copyright NWEA 2009 All Rights Reserved *
 * Created on Oct 5, 2009 *
 *******************************************************************************
 */
package com.nwea.samples.apachecommons.collections;

import java.util.Collection;
import java.util.Comparator;
import java.util.Date;

import org.apache.commons.collections.Closure;
import org.apache.commons.collections.ClosureUtils;
import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.collections.Predicate;
import org.apache.commons.lang.builder.ToStringBuilder;

/**
 * @author ben.berman
 *
 */
public class SampleCollectionUtils {

    @SuppressWarnings("unchecked")
    public static Collection<Student> findStudentsBySex(Collection<Student> students, final String sex) {
        return CollectionUtils.select(students, new Predicate() {
            public boolean evaluate(java.lang.Object s) {
                Student student = (Student) s;
                return student.getSex().equals(sex);
            }
        });
    }

    @SuppressWarnings("unchecked")
    public static void setDefaultHomeroomsBySex(Collection<Student> students, final String femaleHomeroom,
            final String maleHomeroom) {
        // predicate returns true if student sex is "F"
        Predicate ifStatement = new Predicate() {
            public boolean evaluate(Object obj) {
                Student student = (Student) obj;
                return student.getSex().equals("F");
            }
        };

        // closure calls setHomeroom() on Student refs.
        // allows to set "homeRoom" var in instance initializer
        class SetHomeroom implements Closure {
            String homeRoom;

            public void execute(Object obj) {
                Student student = (Student) obj;
                student.setHomeroom(homeRoom);
            }
        }

        CollectionUtils.forAllDo(students, ClosureUtils.ifClosure(ifStatement, new SetHomeroom() {
            {
                homeRoom = femaleHomeroom;
            }
        }, new SetHomeroom() {
            {
                homeRoom = maleHomeroom;
            }
        })); // crazy braces/parens!
    }
}

class Teacher {
    Integer age;
    String name;

    public Integer getAge() {
        return age;
    }

    /**
     * @return the name
     */
    public String getName() {
        return name;
    }

    /**
     * @param name the name to set
     */
    public void setName(String name) {
        this.name = name;
    }
}

class Student {

    private String name;
    private Integer age;
    private String sex;
    private String school;
    private String homeroom = "none";
    Collection<TestEvent> testEvents;

    /**
     * @param name
     * @param age
     * @param sex
     * @param school
     * @param testEvents
     */
    public Student(String name, Integer age, String sex, String school) {
        this.name = name;
        this.age = age;
        this.sex = sex;
        this.school = school;
    }

    public Integer getAge() {
        return age;
    }

    /**
     * @return the name
     */
    public String getName() {
        return name;
    }

    /**
     * @param name the name to set
     */
    public void setName(String name) {
        this.name = name;
    }

    /**
     * @return the sex
     */
    public String getSex() {
        return sex;
    }

    /**
     * @param sex the sex to set
     */
    public void setSex(String sex) {
        this.sex = sex;
    }

    /**
     * @return the school
     */
    public String getSchool() {
        return school;
    }

    /**
     * @param school the school to set
     */
    public void setSchool(String school) {
        this.school = school;
    }

    /**
     * @return the testEvents
     */
    public Collection<TestEvent> getTestEvents() {
        return testEvents;
    }

    /**
     * @param testEvents the testEvents to set
     */
    public void setTestEvents(Collection<TestEvent> testEvents) {
        this.testEvents = testEvents;
    }

    public String toString() {
        return ToStringBuilder.reflectionToString(this);
    }

    /**
     * @return the homeroom
     */
    public String getHomeroom() {
        return homeroom;
    }

    /**
     * @param homeroom the homeroom to set
     */
    public void setHomeroom(String homeroom) {
        this.homeroom = homeroom;
    }
}

class TestEvent {

    private Date testDate;
    private String testName;
    private Integer ritScore;

    /**
     * @return the testDate
     */
    public Date getTestDate() {
        return testDate;
    }

    /**
     * @param testDate the testDate to set
     */
    public void setTestDate(Date testDate) {
        this.testDate = testDate;
    }

    /**
     * @return the testName
     */
    public String getTestName() {
        return testName;
    }

    /**
     * @param testName the testName to set
     */
    public void setTestName(String testName) {
        this.testName = testName;
    }

    /**
     * @return the ritScore
     */
    public Integer getRitScore() {
        return ritScore;
    }

    /**
     * @param ritScore the ritScore to set
     */
    public void setRitScore(Integer ritScore) {
        this.ritScore = ritScore;
    }
}