com.topologi.diffx.event.impl.CharactersEventBase Maven / Gradle / Ivy
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package com.topologi.diffx.event.impl;
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import java.io.IOException;
import com.topologi.diffx.event.DiffXEvent;
import com.topologi.diffx.event.TextEvent;
import com.topologi.diffx.xml.XMLWriter;
/**
* A base class for all the characters events "characters" SAX event.
*
* @author Christophe Lauret
* @version 15 December 2004
*/
public abstract class CharactersEventBase extends DiffXEventBase
implements TextEvent {
/**
* The characters for this event.
*/
private final String characters;
/**
* Creates a new characters event.
*
* @param seq The char sequence.
*
* @throws NullPointerException If the given String is null
.
*/
public CharactersEventBase(CharSequence seq) throws NullPointerException {
if (seq == null)
throw new NullPointerException("The characters cannot be null, use \"\"");
this.characters = seq.toString();
}
/**
* @see java.lang.Object#hashCode()
*/
public final int hashCode() {
return this.characters.hashCode();
}
/**
* Returns true
if the event is a character event and the content is equivalent.
*
* @param e The event to compare with this event.
*
* @return true
if considered equal;
* false
otherwise.
*/
public final boolean equals(DiffXEvent e) {
if (this == e) return true;
if (e.getClass() != this.getClass()) return false;
CharactersEventBase ce = (CharactersEventBase)e;
return (ce.characters.equals(this.characters));
}
/**
* Returns the characters that this event represents.
*
* Note: this method will return the characters as used by Java (ie. Unicode), they
* may not be suitable for writing to an XML string.
*
* @return The characters that this event represents.
*/
public final String getCharacters() {
return characters;
}
/**
* @see com.topologi.diffx.xml.XMLWritable#toXML(com.topologi.diffx.xml.XMLWriter)
*/
public final void toXML(XMLWriter xml) throws IOException {
xml.writeText(this.characters);
}
/**
* @see com.topologi.diffx.xml.XMLWritable#toXML(com.topologi.diffx.xml.XMLWriter)
*/
public final StringBuffer toXML(StringBuffer xml) throws NullPointerException {
xml.append(ESC.toElementText(this.characters));
return xml;
}
}