/*
* 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.echo2.webrender.output;
/**
* A renderable representation of a single CSS style.
*/
public class CssStyle {
// Note that this class uses a proprietary associative array implementation
// in the interest of performance/memory allocation during rendering. The
// implementation is tuned for very low numbers of keys/value which will be
// the typical case in describing a CSS style.
private static final int GROW_RATE = 5 * 2; // Must be a multiple of 2.
private static final String[] EMPTY = new String[0];
private String[] data = EMPTY;
int length = 0; // Number of items * 2;
/**
* Retrieves a style attribute value.
*
* @param attributeName the name of the attribute
* @return the value of the attribute (null if it is not set)
*/
public String getAttribute(String attributeName) {
for (int i = 0; i < length; i += 2) {
if (data[i].equals(attributeName)) {
return data[i + 1];
}
}
return null;
}
/**
* Determines if any attributes are set.
*
* @return true if any attributes are set.
*/
public boolean hasAttributes() {
return length > 0;
}
/**
* Sets a style attribute value.
*
* @param attributeName the name of the attribute.
* @param attributeValue the value of the attribute.
*/
public void setAttribute(String attributeName, String attributeValue) {
if (data == EMPTY) {
data = new String[GROW_RATE];
}
int propertyNameHashCode = attributeName.hashCode();
for (int i = 0; i < data.length; i += 2) {
if (data[i] == null) {
// Property is not set, space remains to set property.
// Add property at end.
data[i] = attributeName;
data[i + 1] = attributeValue;
length += 2;
return;
}
if (propertyNameHashCode == data[i].hashCode() && attributeName.equals(data[i])) {
// Found property, overwrite.
data[i + 1] = attributeValue;
return;
}
}
// Array is full: grow array.
String[] newData = new String[data.length + GROW_RATE];
System.arraycopy(data, 0, newData, 0, data.length);
newData[data.length] = attributeName;
newData[data.length + 1] = attributeValue;
length += 2;
data = newData;
}
/**
* Renders the style inline. The returned value is suitable as the value
* of the "style" attribute of an HTML element.
*
* @return the inline representation
*/
public String renderInline() {
StringBuffer out = new StringBuffer();
for (int i = 0; i < length; i += 2) {
out.append(data[i]);
out.append(":");
out.append(data[i + 1]);
out.append(";");
}
return out.toString();
}
/**
* Renders a debug representation of the object.
*
* @see java.lang.Object#toString()
*/
public String toString() {
return CssStyle.class.getName() + " {" + renderInline() + "}";
}
}