svn commit: r581916 - /xmlgraphics/fop/trunk/src/java/org/apache/fop/render/ps/extensions/AbstractPSExtensionElement.java

[cb...@apache.org]

Author: cbowditch
Date: Thu Oct  4 07:03:03 2007
New Revision: 581916

URL: http://svn.apache.org/viewvc?rev=581916&view=rev
Log:
Bugzilla #42144
Missing File from previous commit
Submitted by Adrian Cumiskey <dev.at.cumiskey.com>

Added:
    xmlgraphics/fop/trunk/src/java/org/apache/fop/render/ps/extensions/AbstractPSExtensionElement.java

Added: xmlgraphics/fop/trunk/src/java/org/apache/fop/render/ps/extensions/AbstractPSExtensionElement.java
URL: http://svn.apache.org/viewvc/xmlgraphics/fop/trunk/src/java/org/apache/fop/render/ps/extensions/AbstractPSExtensionElement.java?rev=581916&view=auto
==============================================================================
--- xmlgraphics/fop/trunk/src/java/org/apache/fop/render/ps/extensions/AbstractPSExtensionElement.java (added)
+++ xmlgraphics/fop/trunk/src/java/org/apache/fop/render/ps/extensions/AbstractPSExtensionElement.java Thu Oct  4 07:03:03 2007
@@ -0,0 +1,133 @@
+/*
+ * 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: AbstractPSExtensionObject.java 426576 2006-07-28 15:44:37Z jeremias $ */
+ 
+package org.apache.fop.render.ps.extensions;
+
+// FOP
+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;
+
+import org.xml.sax.Locator;
+
+/**
+ * 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);
+        }
+    }
+
+    /**
+     * Adds characters (does nothing here)
+     * @param data array of characters containing text to be added
+     * @param start starting array element to add
+     * @param length of data array to add
+     * @param pList currently applicable PropertyList 
+     * @param locator location in fo source file.
+     * @see org.apache.fop.fo.FONode#addCharacters(char[], int, int, PropertyList, Locator)
+     */
+    protected void addCharacters(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 - start);
+            a.setContent(sb.toString());
+        } else {
+            a.setContent(new String(data, start, length - start));
+        }
+    }
+
+    /**
+     * @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 "fox";
+    }
+
+    /**
+     * @see org.apache.fop.fo.FONode#endOfNode()
+     * @throws FOPException if there's a problem during processing
+     */
+    protected 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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