org.apache.fop.render.ps.extensions.AbstractPSExtensionElement Maven / Gradle / Ivy
/*
* 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: AbstractPSExtensionElement.java 1465599 2013-04-08 11:51:52Z vhennebert $ */
package org.apache.fop.render.ps.extensions;
// FOP
import org.xml.sax.Locator;
import org.apache.fop.apps.FOPException;
import org.apache.fop.fo.FONode;
import org.apache.fop.fo.PropertyList;
import org.apache.fop.fo.ValidationException;
import org.apache.fop.fo.extensions.ExtensionAttachment;
/**
* Base class for the PostScript-specific extension elements.
*/
public abstract class AbstractPSExtensionElement extends FONode {
/**
* extension attachment
*/
protected PSExtensionAttachment attachment;
/**
* Default constructor
*
* @param parent parent of this node
* @see org.apache.fop.fo.FONode#FONode(FONode)
*/
public AbstractPSExtensionElement(FONode parent) {
super(parent);
}
/**
* Blocks XSL FO's from having non-FO parents.
*
* @param loc location in the FO source file
* @param nsURI namespace of incoming node
* @param localName (e.g. "table" for "fo:table")
* @throws ValidationException if incoming node not valid for parent
* @see org.apache.fop.fo.FONode#validateChildNode(Locator, String, String)
*/
protected void validateChildNode(Locator loc, String nsURI, String localName)
throws ValidationException {
if (FO_URI.equals(nsURI)) {
invalidChildError(loc, nsURI, localName);
}
}
/** {@inheritDoc} */
protected void characters(char[] data, int start, int length,
PropertyList pList, Locator locator) {
PSExtensionAttachment a = (PSExtensionAttachment)getExtensionAttachment();
if (a.getContent() != null) {
StringBuffer sb = new StringBuffer(a.getContent());
sb.append(data, start, length);
a.setContent(sb.toString());
} else {
a.setContent(new String(data, start, length));
}
}
/**
* @return a String representation of this object
* @see org.apache.fop.fo.FONode#getNamespaceURI()
*/
public String getNamespaceURI() {
return PSExtensionElementMapping.NAMESPACE;
}
/**
* @return a String representation of this object
* @see org.apache.fop.fo.FONode#getNormalNamespacePrefix()
*/
public String getNormalNamespacePrefix() {
return "ps";
}
/**
* @see org.apache.fop.fo.FONode#endOfNode()
* @throws FOPException if there's a problem during processing
*/
public void endOfNode() throws FOPException {
super.endOfNode();
String s = ((PSExtensionAttachment)getExtensionAttachment()).getContent();
if (s == null || s.length() == 0) {
missingChildElementError("#PCDATA");
}
}
/**
* @return the extension attachment if one is created by the extension element, null otherwise.
* @see org.apache.fop.fo.FONode#getExtensionAttachment()
*/
public ExtensionAttachment getExtensionAttachment() {
if (attachment == null) {
this.attachment = (PSExtensionAttachment)instantiateExtensionAttachment();
}
return this.attachment;
}
/**
* Instantiates extension attachment object
* @return extension attachment
*/
protected abstract ExtensionAttachment instantiateExtensionAttachment();
}