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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) 2004, 2008 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.eclipse.core.internal.content;

import java.io.*;
import org.eclipse.core.runtime.QualifiedName;
import org.eclipse.core.runtime.content.IContentDescription;
import org.eclipse.core.runtime.content.ITextContentDescriber;

/**
 * This class provides internal basis for text-based content describers.
 *
 * 
 * Note: do not add protected/public members to this class if you don't intend to
 * make them public API.
 * 
 *
 * @see org.eclipse.core.runtime.content.XMLRootElementContentDescriber2
 * @since 3.0
 */
public class TextContentDescriber implements ITextContentDescriber {

	private final static QualifiedName[] SUPPORTED_OPTIONS = {IContentDescription.BYTE_ORDER_MARK};

	@Override
	public int describe(Reader contents, IContentDescription description) throws IOException {
		// we want to be pretty loose on detecting the text content type
		return INDETERMINATE;
	}

	@Override
	public int describe(InputStream contents, IContentDescription description) throws IOException {
		if (description == null || !description.isRequested(IContentDescription.BYTE_ORDER_MARK))
			return INDETERMINATE;
		byte[] bom = Util.getByteOrderMark(contents);
		if (bom != null)
			description.setProperty(IContentDescription.BYTE_ORDER_MARK, bom);
		// we want to be pretty loose on detecting the text content type
		return INDETERMINATE;
	}

	@Override
	public QualifiedName[] getSupportedOptions() {
		return SUPPORTED_OPTIONS;
	}
}