/*******************************************************************************
 * Copyright (c) 2001, 2004 IBM Corporation and others.
 * 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:
 *     IBM Corporation - initial API and implementation
 *     Jens Lukowski/Innoopract - initial renaming/restructuring
 *     
 *******************************************************************************/
package org.eclipse.wst.dtd.core.internal;

import org.eclipse.wst.sse.core.text.IStructuredDocumentRegion;

// base class for an Element's contentmodel
public abstract class CMNode extends DTDNode {
	public static final String ANY = DTDCoreMessages._UI_LABEL_CM_NODE_ANY; //$NON-NLS-1$
	public static final String CHILDREN = DTDCoreMessages._UI_LABEL_CM_NODE_CHILD_CONTENT; //$NON-NLS-1$

	public static final String EMPTY = DTDCoreMessages._UI_LABEL_CM_NODE_EMPTY; //$NON-NLS-1$
	public static final String MIXED = DTDCoreMessages._UI_LABEL_CM_NODE_MIX_CONTENT; //$NON-NLS-1$
	public static final String PCDATA = DTDCoreMessages._UI_LABEL_CM_NODE_PCDATA; //$NON-NLS-1$


	boolean rootElementContent;

	public CMNode(DTDFile file, IStructuredDocumentRegion flatNode) {
		super(file, flatNode);
	}

	// this is only valid to ask if the content is a root element content
	abstract public String getType();

	/**
	 * Get the value of rootElementContent. This tells us whether this element
	 * content's parent is a direct decendent of the containing element
	 * 
	 * @return value of rootElementContent.
	 */
	public boolean isRootElementContent() {
		return rootElementContent;
	}

	// if this is a root element, change the content to children
	// ie . (child1)
	public void setChildrenContent(String newChild) {
		if (isRootElementContent()) {
			if (!newChild.equals("")) { //$NON-NLS-1$
				beginRecording(this, DTDCoreMessages._UI_LABEL_CM_NODE_SET_CHILD_CONTENT); //$NON-NLS-1$
				replaceText(this, getStartOffset(), getNodeLength(), "(" + newChild + ")"); //$NON-NLS-1$ //$NON-NLS-2$
				endRecording(this);
				return;
			}

			if (!getType().equals(CHILDREN)) {
				beginRecording(this, DTDCoreMessages._UI_LABEL_CM_NODE_SET_CHILD_CONTENT); //$NON-NLS-1$
				if (this instanceof CMBasicNode) {
					replaceText(this, getStartOffset(), getNodeLength(), "(newChild)"); //$NON-NLS-1$
				}
				else {
					// now must convert from mixed content to this one. must
					// preserve the remaining children
					CMGroupNode group = (CMGroupNode) this;
					CMNode firstChild = (CMNode) group.getFirstChild();
					if (firstChild.getType().equals(PCDATA)) {
						group.delete(firstChild);
					}
				}

				endRecording(this);
			}
		}
	}

	public void setContent(String content) {
		if (isRootElementContent()) {
			beginRecording(this, DTDCoreMessages._UI_LABEL_CM_NODE_SET + " " + content + " " + DTDCoreMessages._UI_LABEL_CM_NODE_CONTENT); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
			replaceText(this, getStartOffset(), getNodeLength(), content);
			endRecording(this);
		}
	}

	// if this is a root element, change the content to mixed
	// ie . (#PCDATA, child1)
	public void setMixedContent() {
		if (isRootElementContent()) {
			if (!getType().equals(MIXED)) {
				beginRecording(this, DTDCoreMessages._UI_LABEL_CM_NODE_SET_MIX_CONTENT); //$NON-NLS-1$
				if (this instanceof CMBasicNode) {
					replaceText(this, getStartOffset(), getNodeLength(), "(#PCDATA | newChild)*"); //$NON-NLS-1$
				}
				else {
					// now must convert from children content to this one.
					// must
					// preserve the children
					CMGroupNode group = (CMGroupNode) this;
					group.setConnector(CMGroupNode.CHOICE);
					group.setOccurrence(CMRepeatableNode.ZERO_OR_MORE);
					CMNode firstChild = (CMNode) group.getFirstChild();
					if (!firstChild.getType().equals(PCDATA)) {
						group.insertChildNode("#PCDATA", 0); //$NON-NLS-1$
					}
				}
				endRecording(this);
			}
		}
	}

	/**
	 * Set the value of rootElementContent.
	 * 
	 * @param v
	 *            Value to assign to rootElementContent.
	 */
	public void setRootElementContent(boolean v) {
		this.rootElementContent = v;
	}

	// public void delete()
	// {
	// if (isRootElementContent())
	// {
	// // then the superclasses delete will be fine
	// super.delete();
	// return;
	// }

	// CMGroupNode parent = (CMGroupNode) getParentNode();
	// parent.removeChildNode(this);
	// }


}