package org.eclipse.jdt.internal.core;

/*
 * (c) Copyright IBM Corp. 2000, 2001.
 * All Rights Reserved.
 */
import org.eclipse.core.resources.*;

import org.eclipse.jdt.core.*;
import org.eclipse.jdt.core.jdom.*;

/**
 * <p>This operation creates a field declaration in a type.
 *
 * <p>Required Attributes:<ul>
 *  <li>Containing Type
 *  <li>The source code for the declaration. No verification of the source is
 *      performed.
 * </ul>
 */
public class CreateFieldOperation extends CreateTypeMemberOperation {
/**
 * When executed, this operation will create a field with the given name
 * in the given type with the specified source.
 *
 * <p>By default the new field is positioned after the last existing field
 * declaration, or as the first member in the type if there are no
 * field declarations.
 */
public CreateFieldOperation(IType parentElement, String source, boolean force) {
	super(parentElement, source, force);
}
/**
 * @see CreateTypeMemberOperation#generateElementDOM
 */
protected IDOMNode generateElementDOM() throws JavaModelException {
	if (fDOMNode == null) {
		fDOMNode = (new DOMFactory()).createField(fSource);
		if (fDOMNode == null) {
			fDOMNode = generateSyntaxIncorrectDOM();
		}
		if (fAlteredName != null && fDOMNode != null) {
			fDOMNode.setName(fAlteredName);
		}
	}
	return fDOMNode;
}
/**
 * @see CreateElementInCUOperation#generateResultHandle
 */
protected IJavaElement generateResultHandle() {
	return getType().getField(fDOMNode.getName());
}
/**
 * @see CreateElementInCUOperation#getMainTaskName
 */
public String getMainTaskName(){
	return Util.bind("operation.createFieldProgress"/*nonNLS*/);
}
/**
 * By default the new field is positioned after the last existing field
 * declaration, or as the first member in the type if there are no
 * field declarations.
 */
protected void initializeDefaultPosition() {
	IType parentElement = getType();
	try {
		IJavaElement[] elements = parentElement.getFields();
		if (elements != null && elements.length > 0) {
			createAfter(elements[elements.length - 1]);
		} else {
			elements = parentElement.getChildren();
			if (elements != null && elements.length > 0) {
				createBefore(elements[0]);
			}
		}
	} catch (JavaModelException e) {
	}
}
/**
 * @see CreateTypeMemberOperation#verifyNameCollision
 */
protected IJavaModelStatus verifyNameCollision() {
	IType type= getType();
	if (type.getField(fDOMNode.getName()).exists()) {
		return new JavaModelStatus(IJavaModelStatusConstants.NAME_COLLISION);
	}
	return JavaModelStatus.VERIFIED_OK;
}
}