com.topologi.diffx.event.impl.AttributeEventImpl Maven / Gradle / Ivy
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package com.topologi.diffx.event.impl;
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import java.io.IOException;
import org.apache.commons.lang.builder.HashCodeBuilder;
import com.topologi.diffx.event.AttributeEvent;
import com.topologi.diffx.event.DiffXEvent;
import com.topologi.diffx.xml.XMLWriter;
/**
* A basic implementation of the attribute event.
*
* This implementation is not namespace aware.
*
* @author Christophe Lauret, Jean-Baptiste Reure
* @version 3 April 2005
*/
public final class AttributeEventImpl extends DiffXEventBase implements AttributeEvent {
/**
* The name of the attribute.
*/
private final String name;
/**
* The value of the attribute.
*/
private final String value;
/**
* Creates a new attribute event.
*
* @param name The local name of the attribute.
* @param value The value of the attribute.
*
* @throws NullPointerException if any of the argument is null
.
*/
public AttributeEventImpl(String name, String value) throws NullPointerException {
if (name == null)
throw new NullPointerException("Attribute must have a name.");
if (value == null)
throw new NullPointerException("The attribute value cannot be null, use \"\".");
this.name = name;
this.value = value;
}
/**
* @see com.topologi.diffx.event.AttributeEvent#getName()
*/
public String getName() {
return this.name;
}
/**
* Always return null
.
*
* @see com.topologi.diffx.event.AttributeEvent#getURI()
*/
public String getURI() {
return null;
}
/**
* @see com.topologi.diffx.event.AttributeEvent#getValue()
*/
public String getValue() {
return this.value;
}
/**
* @see java.lang.Object#hashCode()
*/
// public int hashCode() {
// return this.name.hashCode() + this.value.hashCode();
// }
private int fHashCode;
@Override public int hashCode() {
if ( fHashCode == 0) {
// you pick a hard-coded, randomly chosen, non-zero, odd number
// ideally different for each class
fHashCode = new HashCodeBuilder(17, 37).
append(this.name).
append(this.value).
toHashCode();
}
return fHashCode;
}
/**
* Returns true
if the event is a
*
* @param e The event to compare with this event.
*
* @return true
if this event is equal to the specified event;
* false
otherwise.
*/
public boolean equals(DiffXEvent e) {
if (e.getClass() != this.getClass()) return false;
AttributeEventImpl bae = (AttributeEventImpl)e;
return (bae.name.equals(this.name)
&& bae.value.equals(this.value));
}
/**
* @see Object#toString()
*/
public String toString() {
return "attribute: "+this.name+"="+this.value;
}
/**
* @see com.topologi.diffx.xml.XMLWritable#toXML(com.topologi.diffx.xml.XMLWriter)
*/
public void toXML(XMLWriter xml) throws IOException {
xml.attribute(this.name, this.value);
}
/**
* @see com.topologi.diffx.xml.XMLWritable#toXML(com.topologi.diffx.xml.XMLWriter)
*/
public StringBuffer toXML(StringBuffer xml) throws NullPointerException {
xml.append(' ');
xml.append(this.name);
xml.append("=\"");
xml.append(ESC.toAttributeValue(this.value));
xml.append('"');
return xml;
}
}