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/*
* This file is part of the Echo Web Application Framework (hereinafter "Echo").
* Copyright (C) 2002-2009 NextApp, Inc.
*
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*/
package nextapp.echo.app.serial.property;
import java.util.StringTokenizer;
import org.w3c.dom.Element;
import nextapp.echo.app.Extent;
import nextapp.echo.app.Insets;
import nextapp.echo.app.serial.SerialException;
import nextapp.echo.app.serial.SerialPropertyPeer;
import nextapp.echo.app.util.Context;
import nextapp.echo.app.util.DomUtil;
/**
* SerialPropertyPeer for Insets properties.
*/
public class InsetsPeer
implements SerialPropertyPeer {
/**
* Generates an Insets property from a string representation.
*
* @param value the string representation
* @return the generated Insets value
* @throws SerialException if the provided string representation is not valid
*/
public static Insets fromString(String value)
throws SerialException {
if (value == null) {
return null;
}
Extent[] extents = new Extent[4];
value = value.trim();
StringTokenizer st = new StringTokenizer(value, " ");
int count = 0;
for (int i = 0; i < extents.length && st.hasMoreTokens(); ++i) {
extents[i] = ExtentPeer.fromString(st.nextToken());
++count;
}
switch (count) {
case 1:
return new Insets(extents[0]);
case 2:
return new Insets(extents[1], extents[0]);
case 3:
return new Insets(extents[1], extents[0], extents[1], extents[2]);
case 4:
return new Insets(extents[3], extents[0], extents[1], extents[2]);
default:
throw new SerialException("Invalid extent string: " + value, null);
}
}
/**
* Determines if two extent values are equivalent.
*
* @param extent1 the first extent
* @param extent2 the second extent
* @return true if the extents are equivalent.
*/
private static boolean equals(Extent extent1, Extent extent2) {
if (extent1 == null && extent2 == null) {
return true;
} else if (extent1 == null || extent2 == null) {
return false;
}
return extent1.equals(extent2);
}
/**
* Utility method; converts an extent to a string, returning 0 for null values.
*
* @param extent the extent
* @return a string representation of the extent, or 0 if the extent is null
* @throws SerialException
*/
private static String toString(Extent extent)
throws SerialException {
return extent == null ? "0px" : ExtentPeer.toString(extent);
}
/**
* Generates a string representation of an Insets property.
*
* @param insets the Insets property
* @return a string representation
* @throws SerialException
*/
public static String toString(Insets insets)
throws SerialException {
if (equals(insets.getTop(), insets.getBottom())) {
if (equals(insets.getLeft(), insets.getRight())) {
if (equals(insets.getTop(), insets.getLeft())) {
// All sides are equal.
return toString(insets.getTop());
} else {
// Horizontal and vertical are equal.
return toString(insets.getTop()) + " " + toString(insets.getLeft());
}
}
}
return toString(insets.getTop())
+ " " + toString(insets.getRight())
+ " " + toString(insets.getBottom())
+ " " + toString(insets.getLeft());
}
/**
* @see nextapp.echo.app.serial.SerialPropertyPeer#toProperty(Context,
* Class, org.w3c.dom.Element)
*/
public Object toProperty(Context context, Class objectClass, Element propertyElement)
throws SerialException {
return fromString(propertyElement.hasAttribute("v")
? propertyElement.getAttribute("v") : DomUtil.getElementText(propertyElement));
}
/**
* @see nextapp.echo.app.serial.SerialPropertyPeer#toXml(nextapp.echo.app.util.Context,
* java.lang.Class, org.w3c.dom.Element, java.lang.Object)
*/
public void toXml(Context context, Class objectClass, Element propertyElement, Object propertyValue)
throws SerialException {
propertyElement.appendChild(propertyElement.getOwnerDocument().createTextNode(toString((Insets) propertyValue)));
}
}
