Java/Apache Common/Converter Utils

Convert Utils Demo

   <source lang="java">

import org.apache.rumons.beanutils.Converter; import org.apache.rumons.beanutils.PropertyUtils; import org.apache.rumons.beanutils.BeanUtilsBean; import org.apache.rumons.beanutils.ConvertUtilsBean; import org.apache.rumons.beanutils.PropertyUtilsBean; import org.apache.rumons.beanutils.ConversionException; import java.util.Map; public class BeanUtilsExampleV4 {

 public static void main(String args[]) throws Exception {
   BeanUtilsExampleV4 diff = new BeanUtilsExampleV4();
   Actor actor = diff.prepareData();
   ConvertUtilsBean convertUtilsBean = new ConvertUtilsBean();
   convertUtilsBean.deregister(String.class);
   convertUtilsBean.register(new MyStringConverter(), String.class);
   convertUtilsBean.deregister(Long.class);
   convertUtilsBean.register(new MyLongConverter(), Long.class);
   convertUtilsBean.register(new MyLongConverter(), Long.TYPE);
   BeanUtilsBean beanUtilsBean =
     new BeanUtilsBean(convertUtilsBean, new PropertyUtilsBean());
   System.err.println("==== Values before calling describe ==== ");
   System.err.println("By PropertyUtils: " +
     PropertyUtils.getProperty(actor, "name"));
   System.err.println("By BeanUtils: " +
     beanUtilsBean.getProperty(actor, "name"));
   System.err.println(beanUtilsBean.getProperty(actor, "worth"));
   Map describedData = beanUtilsBean.describe(actor);
   // check the map
   System.err.println("==== Values in Map ==== ");
   System.err.println(describedData.get("name"));
   System.err.println(describedData.get("worth"));
   // create a new Actor Bean
   Actor newActor = new Actor();
   beanUtilsBean.populate(newActor, describedData);
   System.err.println("==== Values after calling populate ==== ");
   System.err.println(beanUtilsBean.getProperty(newActor, "name"));
   System.err.println(beanUtilsBean.getProperty(newActor, "worth"));
 }
 private Actor prepareData() {
   Actor actor = new Actor();
   actor.setName("Michael Caine");
   actor.setGender(1);
   actor.setWorth(10000000);
   return actor;
 }

} class MyStringConverter implements Converter {

 public Object convert(Class type, Object value) {
   if(value == null) {
     return (String)null;
   } else {
     return (value.toString().replaceAll("\\s", ""));
   }
 }

} class MyLongConverter implements Converter {

 private Object defaultValue;
 private boolean useDefault;
 public MyLongConverter() {
   this(true, new Long(0));
 }
 public MyLongConverter(boolean useDefault, Object defaultValue) {
   this.useDefault = useDefault;
   this.defaultValue = defaultValue;
 }
 public Object convert(Class type, Object value) {
   if(value == null) {
     if(useDefault) {
       return defaultValue;
     } else {
       throw new ConversionException("No default value specified");
     }
   }
   if(value instanceof Long) {
     return new Long(((Long)value).longValue() + 1000);
   } else {
     try {
       return new Long(new Long(value.toString()).longValue() + 1000);
     } catch (Exception e) {
       System.err.println(e);
       if(useDefault) {
         return defaultValue;
       } else {
         throw new ConversionException(e);
       }
     }
   }
 }

}

---

import java.util.Map; import java.util.List; import java.util.Date; public class Movie {

 public Movie() {
 }
 public Date getDateOfRelease() { return this.dateOfRelease; }
 public void setDateOfRelease(Date dateOfRelease) {
   this.dateOfRelease = dateOfRelease;
 }
 public String getTitle() { return this.title; }
 public void setTitle(String title) {this.title = title; }
 public Person getDirector() { return this.director; }
 public void setDirector(Person director) { this.director = director; }
 public List getActors() { return this.actors; }
 public void setActors(List actors) { this.actors= actors; }
 public String[] getKeywords() { return this.keywords; }
 public void setKeyWords(String[] keywords) { this.keywords = keywords; }
 public Map getGenre() { return this.genre; }
 public void setGenre(Map genre) { this.genre = genre; }
 private Date dateOfRelease;
 private String title;
 private Person director;
 private List actors;
 private String[] keywords;
 private Map genre;

}

---

import java.util.Map; import org.apache.rumons.lang.builder.EqualsBuilder; import org.apache.rumons.lang.builder.HashCodeBuilder; import org.apache.rumons.lang.builder.ToStringBuilder; public class Person {

 public Person() {
 }
 public String getName() {
   return this.name == null ? "NoName" : this.name; }
 public void setName(String name) { this.name = name; }
 public int getGender() { return this.gender; }
 public void setGender(int gender) {  // 0 - Indeterminate, 1 - Male, 2 - Female
   this.gender = (gender > 2 || gender < 0) ? 0 : gender; }
 public Map getContactNumber() { return this.contactNumber; }
 public void setContactNumber(Map contactNumber) {
   this.contactNumber = contactNumber;
 }
 /**public boolean equals(Object o) {
   if(o == this) return true;
   if(!(o instanceof Person)) return false;
   Person otherPerson = (Person)o;
   if(otherPerson.getName().equals(this.name) &&
      otherPerson.getGender() == this.gender) return true;
   return false;
 }*/
 public boolean equals(Object o) {
   if(!(o instanceof Person)) return false;
   Person otherPerson = (Person)o;
   return new EqualsBuilder()
              .append(name, otherPerson.getName())
              .append(gender, otherPerson.getGender())
              .isEquals();
 }
 public int hashCode() {
   return new HashCodeBuilder(7, 51)
              .append(name)
              .append(gender)
              .append(contactNumber)
              .toHashCode();
 }
 public String toString() {
   return new ToStringBuilder(this)
              .append("Name", name)
              .append("Gender", gender)
              .append("Contact Details", contactNumber)
              .toString();
 }
 private String name;
 private int gender;
 private Map contactNumber;

}

---

import java.util.List; public class Actor extends Person {

 public Actor() {
 }
 public List getMovieCredits() { return this.movieCredits; }
 public void setMovieCredits(List movieCredits) {
   this.movieCredits = movieCredits;
 }
 public long getWorth() { return this.worth; }
 public void setWorth(long worth) { this.worth = worth; }
 private List movieCredits;
 private long worth;

}

      </source>