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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.fo.properties;
import java.net.URI;
import java.net.URISyntaxException;
import org.apache.fop.datatypes.URISpecification;
import org.apache.fop.fo.FObj;
import org.apache.fop.fo.PropertyList;
import org.apache.fop.fo.expr.PropertyException;
import static org.apache.fop.fo.Constants.PR_X_XML_BASE;
/**
* Class modeling a property that has a value of type <uri-specification>.
* The purpose is mainly to support resolution of a specified
* relative URI against a specified or inherited <code>xml:base</code>
* during the property refinement stage.
* If no <code>xml:base</code> has been specified, only the original URI, as
* it appears in the source document, is stored as the property's specified
* value.
*/
public class URIProperty extends Property {
/** will be null if the URI is not resolved against an xml:base */
private URI resolvedURI;
/**
* Default constructor, to create a {@link URIProperty} from a
* {@code java.net.URI} directly.
* @param uri a resolved {@code java.net.URI}
*/
protected URIProperty(URI uri) {
this.resolvedURI = uri;
}
/**
* Alternate constructor, to create a {@link URIProperty} from a
* string representation.
* @param uri a {@code java.lang.String} representing the URI
* @param resolve flag indicating whether this URI was the result of resolution
* @throws IllegalArgumentException if the URI should be resolved, but is not valid.
*/
private URIProperty(String uri, boolean resolve) {
if (resolve && !(uri == null || "".equals(uri))) {
this.resolvedURI = URI.create(uri);
} else {
setSpecifiedValue(uri);
}
}
/**
* Return a string representing the resolved URI, or the
* specified value if the URI is not resolved against
* an <code>xml:base</code>
* @return a string representing the URI
*/
@Override
public String getString() {
if (resolvedURI == null) {
return getSpecifiedValue();
} else {
return resolvedURI.toString();
}
}
/** {@inheritDoc} */
@Override
public String toString() {
return this.getString();
}
/**
* Inner {@link PropertyMaker} subclass responsible
* for making instances of this type.
*/
public static class Maker extends PropertyMaker {
/**
* Create a maker for the given property id
*
* @param propId the id of the property for which a Maker should be created
*/
public Maker(int propId) {
super(propId);
}
/**
* {@inheritDoc}
* Check if {@code xml:base} has been specified and whether the
* given {@code value} represents a relative URI. If so, create
* a property representing the resolved URI.
*/
@Override
public Property make(PropertyList propertyList, String value,
FObj fo) throws PropertyException {
Property p = null;
//special treament for data: URIs
if (value.matches("(?s)^(url\\(('|\")?)?data:.*$")) {
p = new URIProperty(value, false);
} else {
try {
URI specifiedURI = new URI(URISpecification.escapeURI(value));
URIProperty xmlBase = (URIProperty)propertyList.get(PR_X_XML_BASE, true, false);
if (xmlBase == null) {
//xml:base undefined
if (this.propId == PR_X_XML_BASE) {
//if current property is xml:base, define a new one
p = new URIProperty(specifiedURI);
p.setSpecifiedValue(value);
} else {
//otherwise, just store the specified value (for backward compatibility)
p = new URIProperty(value, false);
}
} else {
//xml:base defined, so resolve
p = new URIProperty(xmlBase.resolvedURI.resolve(specifiedURI));
p.setSpecifiedValue(value);
}
} catch (URISyntaxException use) {
// Let PropertyList propagate the exception
throw new PropertyException("Invalid URI specified");
}
}
return p;
}
}
}
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