src.main.java.com.eva.properties.Reference Maven / Gradle / Ivy
/*
* $Id: Reference.java 22 2007-02-12 21:57:00Z max $
*
* Copyright (c) 2006-2007 Maximilian Antoni. All rights reserved.
*
* This software is licensed as described in the file LICENSE.txt, which you
* should have received as part of this distribution. The terms are also
* available at http://www.maxantoni.de/projects/eva-properties/license.txt.
*/
package com.eva.properties;
/**
* is a reference of the form ${house.room.chair.0.color}.
*
* @author Max Antoni
* @version $Revision: 22 $
*/
public class Reference implements Replaceable {
private String reference;
/**
* creates a reference with a reference string.
*
* @param inReference the reference.
*/
public Reference(String inReference) {
super();
if(inReference == null) {
throw new NullPointerException("Reference cannot be null.");
}
if("".equals(inReference)) {
throw new IllegalArgumentException("Reference cannot be empty.");
}
reference = inReference;
}
/*
* @see com.eva.properties.Replaceable#copy(com.eva.properties.Properties)
*/
public Replaceable copy(Properties inParent) {
return new Reference(reference);
}
/*
* @see com.eva.properties.Replaceable#replace(com.eva.properties.Context)
*/
public Object replace(Context inContext) throws PropertiesException {
return inContext.lookup(reference);
}
/*
* @see java.lang.Object#toString()
*/
public String toString() {
return "${" + reference + "}";
}
/*
* @see com.eva.properties.Replaceable#toString(java.lang.StringBuffer,
* java.lang.String)
*/
public void write(Writer inoutWriter) {
inoutWriter.append("${");
inoutWriter.append(reference);
inoutWriter.append("}");
inoutWriter.appendNewline();
}
/**
* returns the reference string for this reference.
*
* @return the reference string.
*/
String getReference() {
return reference;
}
}