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AspectJ tools most notably contains the AspectJ compiler (AJC). AJC applies aspects to Java classes during compilation, fully replacing Javac for plain Java classes and also compiling native AspectJ or annotation-based @AspectJ syntax. Furthermore, AJC can weave aspects into existing class files in a post-compile binary weaving step. This library is a superset of AspectJ weaver and hence also of AspectJ runtime.

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/*******************************************************************************
 * Copyright (c) 2000, 2013 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.aspectj.org.eclipse.jdt.internal.core;

import java.util.Iterator;

import org.aspectj.org.eclipse.jdt.core.ICompilationUnit;
import org.aspectj.org.eclipse.jdt.core.IField;
import org.aspectj.org.eclipse.jdt.core.IJavaElement;
import org.aspectj.org.eclipse.jdt.core.IJavaModelStatus;
import org.aspectj.org.eclipse.jdt.core.IJavaModelStatusConstants;
import org.aspectj.org.eclipse.jdt.core.IType;
import org.aspectj.org.eclipse.jdt.core.JavaModelException;
import org.aspectj.org.eclipse.jdt.core.dom.ASTNode;
import org.aspectj.org.eclipse.jdt.core.dom.FieldDeclaration;
import org.aspectj.org.eclipse.jdt.core.dom.SimpleName;
import org.aspectj.org.eclipse.jdt.core.dom.VariableDeclarationFragment;
import org.aspectj.org.eclipse.jdt.core.dom.rewrite.ASTRewrite;
import org.aspectj.org.eclipse.jdt.internal.core.util.Messages;

/**
 * This operation creates a field declaration in a type.
 *
 * 
Required Attributes:

 *  Containing Type
 *  
The source code for the declaration. No verification of the source is
 *      performed.
 * 
 */
@SuppressWarnings("rawtypes")
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.
 *
 * 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);
}
@Override
protected ASTNode generateElementAST(ASTRewrite rewriter, ICompilationUnit cu) throws JavaModelException {
	ASTNode node = super.generateElementAST(rewriter, cu);
	if (node.getNodeType() != ASTNode.FIELD_DECLARATION)
		throw new JavaModelException(new JavaModelStatus(IJavaModelStatusConstants.INVALID_CONTENTS));
	return node;
}
/**
 * @see CreateElementInCUOperation#generateResultHandle
 */
@Override
protected IJavaElement generateResultHandle() {
	return getType().getField(getASTNodeName());
}
/**
 * @see CreateElementInCUOperation#getMainTaskName()
 */
@Override
public String getMainTaskName(){
	return Messages.operation_createFieldProgress;
}
private VariableDeclarationFragment getFragment(ASTNode node) {
	Iterator fragments =  ((FieldDeclaration) node).fragments().iterator();
	if (this.anchorElement != null) {
		VariableDeclarationFragment fragment = null;
		String fragmentName = this.anchorElement.getElementName();
		while (fragments.hasNext()) {
			fragment = (VariableDeclarationFragment) fragments.next();
			if (fragment.getName().getIdentifier().equals(fragmentName)) {
				return fragment;
			}
		}
		return fragment;
	} else {
		return (VariableDeclarationFragment) fragments.next();
	}
}
/**
 * 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.
 */
@Override
protected void initializeDefaultPosition() {
	IType parentElement = getType();
	try {
		IField[] fields = parentElement.getFields();
		if (fields != null && fields.length > 0) {
			final IField lastField = fields[fields.length - 1];
			if (parentElement.isEnum()) {
				IField field = lastField;
				if (!field.isEnumConstant()) {
					createAfter(lastField);
				}
			} else {
				createAfter(lastField);
			}
		} else {
			IJavaElement[] elements = parentElement.getChildren();
			if (elements != null && elements.length > 0) {
				createBefore(elements[0]);
			}
		}
	} catch (JavaModelException e) {
		// type doesn't exist: ignore
	}
}
/**
 * @see CreateTypeMemberOperation#verifyNameCollision
 */
@Override
protected IJavaModelStatus verifyNameCollision() {
	if (this.createdNode != null) {
		IType type= getType();
		String fieldName = getASTNodeName();
		if (type.getField(fieldName).exists()) {
			return new JavaModelStatus(
				IJavaModelStatusConstants.NAME_COLLISION,
				Messages.bind(Messages.status_nameCollision, fieldName));
		}
	}
	return JavaModelStatus.VERIFIED_OK;
}
private String getASTNodeName() {
	if (this.alteredName != null) return this.alteredName;
	return getFragment(this.createdNode).getName().getIdentifier();
}
@Override
protected SimpleName rename(ASTNode node, SimpleName newName) {
	VariableDeclarationFragment fragment = getFragment(node);
	SimpleName oldName = fragment.getName();
	fragment.setName(newName);
	return oldName;
}
}