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/*******************************************************************************
* Copyright (c) 2004, 2008 John Krasnay and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* John Krasnay - initial API and implementation
*******************************************************************************/
package org.eclipse.wst.xml.vex.core.internal.css;
/**
* A length that may be expressed as an absolute or relative value.
*/
public class RelativeLength {
private float percentage;
private int absolute;
boolean isAbsolute;
private static RelativeLength ZERO = new RelativeLength(0, 0, true);
/**
* Create a relative length representing an absolute value.
*
* @return the new RelativeLength value.
*/
public static RelativeLength createAbsolute(int value) {
if (value == 0) {
return ZERO;
} else {
return new RelativeLength(0, value, true);
}
}
/**
* Create a relative length representing a relative value.
*
* @return the new RelativeLength value.
*/
public static RelativeLength createRelative(float percentage) {
return new RelativeLength(percentage, 0, false);
}
/**
* Return the value of the length given a reference value. If this object
* represents an absolute value, that value is simply returned. Otherwise,
* returns the given reference length multiplied by the given percentage and
* rounded to the nearest integer.
*
* @param referenceLength
* reference length by which percentage lengths will by
* multiplied.
* @return the actual value
*/
public int get(int referenceLength) {
if (this.isAbsolute) {
return this.absolute;
} else {
return Math.round(this.percentage * referenceLength);
}
}
// ==================================================== PRIVATE
private RelativeLength(float percentage, int absolute, boolean isAbsolute) {
this.percentage = percentage;
this.absolute = absolute;
this.isAbsolute = isAbsolute;
}
}
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