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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 org.w3c.dom.Element;
import nextapp.echo.app.DecimalExtent;
import nextapp.echo.app.Extent;
import nextapp.echo.app.serial.SerialException;
import nextapp.echo.app.serial.SerialPropertyPeer;
import nextapp.echo.app.util.ConstantMap;
import nextapp.echo.app.util.Context;
import nextapp.echo.app.util.DomUtil;
/**
* SerialPropertyPeer for Extent properties.
*/
public class ExtentPeer
implements SerialPropertyPeer {
/**
* ConstantMap between extent string values and integer constants.
*/
private static final ConstantMap suffixConstantMap = new ConstantMap();
static {
suffixConstantMap.add(Extent.PX, "px");
suffixConstantMap.add(Extent.CM, "cm");
suffixConstantMap.add(Extent.EM, "em");
suffixConstantMap.add(Extent.EX, "ex");
suffixConstantMap.add(Extent.IN, "in");
suffixConstantMap.add(Extent.MM, "mm");
suffixConstantMap.add(Extent.PC, "pc");
suffixConstantMap.add(Extent.PT, "pt");
suffixConstantMap.add(Extent.PERCENT, "%");
}
/**
* Generates an Extent from a string value.
*
* @param value the string value
* @return an Extent (may be a DecimalExtent if the value contains a fractional part)
* @throws SerialException
*/
public static Extent fromString(String value)
throws SerialException {
if (value == null) {
return null;
}
value = value.trim();
int separatorPoint = -1;
int length = value.length();
for (int i = length - 1; i >= 0; --i) {
char ch = value.charAt(i);
if (Character.isDigit(ch) || ch == '.') {
separatorPoint = i + 1;
break;
}
}
if (separatorPoint == -1) {
throw new SerialException("Cannot create extent from value: " + value, null);
}
String valueString = value.substring(0, separatorPoint);
String unitString = value.substring(separatorPoint);
int extentUnits = suffixConstantMap.get(unitString, -1);
try {
if (valueString.indexOf('.') == -1) {
int extentValue = Integer.parseInt(valueString);
if (extentUnits == -1) {
// Return pixel-based extent.
return new Extent(extentValue);
}
return new Extent(extentValue, extentUnits);
} else {
double decimalExtentValue = Double.parseDouble(valueString);
if (extentUnits == -1) {
// Return pixel-based extent.
return new DecimalExtent(decimalExtentValue);
}
return new DecimalExtent(decimalExtentValue, extentUnits);
}
} catch (NumberFormatException ex) {
throw new SerialException("Cannot create extent from value: " + value, ex);
}
}
/**
* Returns a string representation of an Extent value.
*
* @param extent the Extent (or DecimalExtent)
* @return a string representation
* @throws SerialException
*/
public static String toString(Extent extent)
throws SerialException {
if (extent instanceof DecimalExtent) {
return ((DecimalExtent) extent).getDecimalValue() + suffixConstantMap.get(extent.getUnits());
} else {
return extent.getValue() + suffixConstantMap.get(extent.getUnits());
}
}
/**
* @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((Extent) propertyValue)));
}
}
