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package bjc.utils.components;
/**
* Generic implementation of a description for a component.
*
* @author ben
*/
public class ComponentDescription implements DescribedComponent {
/* Check arguments are good. */
@SuppressWarnings("unused")
private static void sanityCheckArgs(final String name, final String author,
final String description, final int version) {
if (name == null) {
throw new NullPointerException("Component name can't be null");
} else if (version <= 0) {
throw new IllegalArgumentException(
"Component version must be greater than 0");
}
}
/** The author of the component */
private final String author;
/** The description of the component */
private final String description;
/** The name of the component */
private final String name;
/** The version of the component */
private final int version;
/**
* Create a new component description.
*
* @param name
* The name of the component.
*
* @param author
* The author of the component.
*
* @param description
* The description of the component.
*
* @param version
* The version of the component.
*
* @throws IllegalArgumentException
* Thrown if version is less than 1.
*/
public ComponentDescription(final String name, final String author,
final String description, final int version) {
sanityCheckArgs(name, author, description, version);
this.name = name;
this.author = author;
this.description = description;
this.version = version;
}
@Override
public String getAuthor() {
if (author == null) {
return DescribedComponent.super.getAuthor();
}
return author;
}
@Override
public String getDescription() {
if (description == null) {
return DescribedComponent.super.getDescription();
}
return description;
}
@Override
public String getName() {
return name;
}
@Override
public int getVersion() {
return version;
}
@Override
public String toString() {
return String.format("%s component v%d, written by %s", name, version, author);
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#hashCode()
*/
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + (author == null ? 0 : author.hashCode());
result = prime * result + (description == null ? 0 : description.hashCode());
result = prime * result + (name == null ? 0 : name.hashCode());
result = prime * result + version;
return result;
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#equals(java.lang.Object)
*/
@Override
public boolean equals(final Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
final ComponentDescription other = (ComponentDescription) obj;
if (author == null) {
if (other.author != null)
return false;
} else if (!author.equals(other.author))
return false;
if (description == null) {
if (other.description != null)
return false;
} else if (!description.equals(other.description))
return false;
if (name == null) {
if (other.name != null)
return false;
} else if (!name.equals(other.name))
return false;
if (version != other.version)
return false;
return true;
}
}
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