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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.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();
- }
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