| /******************************************************************************* |
| * Copyright (c) 2005 Oracle Corporation. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Ian Trimble - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jst.pagedesigner.dtmanager.converter.operations; |
| |
| import java.util.ArrayList; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| import org.eclipse.jst.pagedesigner.dtmanager.converter.ITagConverterContext; |
| import org.eclipse.jst.pagedesigner.dtmanager.converter.ITransformOperation; |
| import org.w3c.dom.Element; |
| import org.w3c.dom.Node; |
| import org.w3c.dom.NodeList; |
| |
| /** |
| * Abstract ITransformOperation implementation. Maintains ITagConverterContext |
| * instance and collection of child ITransformOperation instances. |
| * |
| * @author Ian Trimble - Oracle |
| */ |
| public abstract class AbstractTransformOperation implements ITransformOperation { |
| |
| /** |
| * ITagConverterContext instance. |
| */ |
| protected ITagConverterContext tagConverterContext; |
| |
| /** |
| * Collection of child ITransformOperation instances. |
| */ |
| protected List childOperations; |
| |
| /* |
| * (non-Javadoc) |
| * @see org.eclipse.jst.pagedesigner.dtmanager.converter.ITransformOperation#transform(org.w3c.dom.Element, org.w3c.dom.Element) |
| */ |
| public abstract Element transform(Element srcElement, Element curElement); |
| |
| /* |
| * (non-Javadoc) |
| * @see org.eclipse.jst.pagedesigner.dtmanager.converter.ITransformOperation#setTagConverterContext(org.eclipse.jst.pagedesigner.dtmanager.converter.internal.provisional.ITagConverterContext) |
| */ |
| public void setTagConverterContext(ITagConverterContext tagConverterContext) { |
| // API: this should really be set on construction since other methods |
| // cannot be called until it is set. |
| this.tagConverterContext = tagConverterContext; |
| } |
| |
| /* |
| * (non-Javadoc) |
| * @see org.eclipse.jst.pagedesigner.dtmanager.converter.ITransformOperation#appendChildOperation(org.eclipse.jst.pagedesigner.dtmanager.converter.internal.provisional.ITransformOperation) |
| */ |
| public void appendChildOperation(ITransformOperation operation) { |
| if (operation != null) { |
| if (childOperations == null) { |
| childOperations = new ArrayList(); |
| } |
| operation.setTagConverterContext(tagConverterContext); |
| childOperations.add(operation); |
| } |
| } |
| |
| /* |
| * (non-Javadoc) |
| * @see org.eclipse.jst.pagedesigner.dtmanager.converter.ITransformOperation#getChildOperations() |
| */ |
| public List getChildOperations() { |
| return childOperations; |
| } |
| |
| /** |
| * Convenience method to execute child ITransformOperation instances. |
| * |
| * @param srcElement Source Element instance. |
| * @param curElement Current Element instance (that is being transformed). |
| * @return New current Element instance. |
| */ |
| protected Element executeChildOperations(Element srcElement, Element curElement) { |
| Element retElement = curElement; |
| if (childOperations != null && childOperations.size() > 0) { |
| Iterator itChildOperations = childOperations.iterator(); |
| while (itChildOperations.hasNext()) { |
| ITransformOperation childOperation = (ITransformOperation)itChildOperations.next(); |
| retElement = childOperation.transform(srcElement, retElement); |
| } |
| } |
| return retElement; |
| } |
| |
| /** |
| * Creates a new Element. |
| * |
| * @param tagName Name of Element to be created. |
| * @return New Element instance. |
| */ |
| protected Element createElement(String tagName) { |
| ITransformOperation operation = |
| TransformOperationFactory.getInstance().getTransformOperation( |
| TransformOperationFactory.OP_CreateElementOperation, |
| new String[]{tagName}); |
| operation.setTagConverterContext(tagConverterContext); |
| return operation.transform(null, null); |
| } |
| |
| /** |
| * Creates and appends a new child Element. |
| * |
| * @param tagName Name of child Element to be created. |
| * @param parentElement Element instance to which to append the new |
| * Element. |
| * @return New Element instance. |
| */ |
| protected Element appendChildElement(String tagName, Element parentElement) { |
| ITransformOperation operation = |
| TransformOperationFactory.getInstance().getTransformOperation( |
| TransformOperationFactory.OP_AppendChildElementOperation, |
| new String[]{tagName}); |
| operation.setTagConverterContext(tagConverterContext); |
| return operation.transform(null, parentElement); |
| } |
| |
| /** |
| * Creates and appends a new child Text. |
| * |
| * @param content Content of new child Text. |
| * @param parentElement Element instance to which to append the new Text. |
| */ |
| protected void appendChildText(String content, Element parentElement) { |
| ITransformOperation operation = |
| TransformOperationFactory.getInstance().getTransformOperation( |
| TransformOperationFactory.OP_AppendChildTextOperation, |
| new String[]{content}); |
| operation.setTagConverterContext(tagConverterContext); |
| operation.transform(null, parentElement); |
| } |
| |
| /** |
| * Gets collection of child Element instances who's local name matches |
| * specified tag name. |
| * |
| * @param srcNode Source Node instance. |
| * @param tagName Tag local name. |
| * @return Collection of child Element instances who's local name matches |
| * specified tag name. |
| */ |
| protected List getChildElements(Node srcNode, String tagName) { |
| List childElements = new ArrayList(); |
| NodeList childNodes = srcNode.getChildNodes(); |
| for (int i = 0; i < childNodes.getLength(); i++) { |
| Node curNode = childNodes.item(i); |
| if (curNode.getNodeType() == Node.ELEMENT_NODE) { |
| String curNodeName = curNode.getLocalName(); |
| if (curNode != null && curNodeName.equals(tagName)) { |
| childElements.add(curNode); |
| } |
| } |
| } |
| return childElements; |
| } |
| |
| } |