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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id$ */
package org.apache.fop.util;
import java.awt.Rectangle;
import java.awt.geom.Rectangle2D;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.AttributesImpl;
/**
* A collection of utility method for XML handling.
*/
public class XMLUtil implements XMLConstants {
/**
* Returns an attribute value as a boolean value.
* @param attributes the Attributes object
* @param name the name of the attribute
* @param defaultValue the default value if the attribute is not specified
* @return the attribute value as a boolean
*/
public static boolean getAttributeAsBoolean(Attributes attributes, String name,
boolean defaultValue) {
String s = attributes.getValue(name);
if (s == null) {
return defaultValue;
} else {
return Boolean.valueOf(s).booleanValue();
}
}
/**
* Returns an attribute value as a int value.
* @param attributes the Attributes object
* @param name the name of the attribute
* @param defaultValue the default value if the attribute is not specified
* @return the attribute value as an int
*/
public static int getAttributeAsInt(Attributes attributes, String name,
int defaultValue) {
String s = attributes.getValue(name);
if (s == null) {
return defaultValue;
} else {
return Integer.parseInt(s);
}
}
/**
* Returns an attribute value as a int value.
* @param attributes the Attributes object
* @param name the name of the attribute
* @return the attribute value as an int
* @throws SAXException if the attribute is missing
*/
public static int getAttributeAsInt(Attributes attributes, String name) throws SAXException {
String s = attributes.getValue(name);
if (s == null) {
throw new SAXException("Attribute '" + name + "' is missing");
} else {
return Integer.parseInt(s);
}
}
/**
* Returns an attribute value as a Integer value.
* @param attributes the Attributes object
* @param name the name of the attribute
* @return the attribute value as an Integer or null if the attribute is missing
*/
public static Integer getAttributeAsInteger(Attributes attributes, String name) {
String s = attributes.getValue(name);
if (s == null) {
return null;
} else {
return new Integer(s);
}
}
/**
* Returns an attribute value as a Rectangle2D value. The string value is expected as 4
* double-precision numbers separated by whitespace.
* @param attributes the Attributes object
* @param name the name of the attribute
* @return the attribute value as an Rectangle2D
*/
public static Rectangle2D getAttributeAsRectangle2D(Attributes attributes, String name) {
String s = attributes.getValue(name).trim();
double[] values = ConversionUtils.toDoubleArray(s, "\\s");
if (values.length != 4) {
throw new IllegalArgumentException("Rectangle must consist of 4 double values!");
}
return new Rectangle2D.Double(values[0], values[1], values[2], values[3]);
}
/**
* Returns an attribute value as a Rectangle value. The string value is expected as 4
* integer numbers separated by whitespace.
* @param attributes the Attributes object
* @param name the name of the attribute
* @return the attribute value as an Rectangle
*/
public static Rectangle getAttributeAsRectangle(Attributes attributes, String name) {
String s = attributes.getValue(name);
if (s == null) {
return null;
}
int[] values = ConversionUtils.toIntArray(s.trim(), "\\s");
if (values.length != 4) {
throw new IllegalArgumentException("Rectangle must consist of 4 int values!");
}
return new Rectangle(values[0], values[1], values[2], values[3]);
}
/**
* Returns an attribute value as a integer array. The string value is expected as 4
* integer numbers separated by whitespace.
* @param attributes the Attributes object
* @param name the name of the attribute
* @return the attribute value as an int array
*/
public static int[] getAttributeAsIntArray(Attributes attributes, String name) {
String s = attributes.getValue(name);
if (s == null) {
return null;
} else {
return ConversionUtils.toIntArray(s.trim(), "\\s");
}
}
/**
* Adds an attribute to a given {@code AttributesImpl} instance.
* @param atts the attributes collection
* @param attribute the attribute to add
* @param value the attribute's CDATA value
*/
public static void addAttribute(AttributesImpl atts,
org.apache.xmlgraphics.util.QName attribute, String value) {
atts.addAttribute(attribute.getNamespaceURI(),
attribute.getLocalName(), attribute.getQName(), XMLUtil.CDATA, value);
}
/**
* Adds an attribute to a given {@code AttributesImpl} instance. The attribute will be
* added in the default namespace.
* @param atts the attributes collection
* @param localName the local name of the attribute
* @param value the attribute's CDATA value
*/
public static void addAttribute(AttributesImpl atts, String localName, String value) {
atts.addAttribute("", localName, localName, XMLUtil.CDATA, value);
}
}
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