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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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package org.aspectj.apache.bcel.classfile;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;

import org.aspectj.apache.bcel.Constants;

public class AttributeUtils {

	public static Attribute[] readAttributes(DataInputStream dataInputstream, ConstantPool cpool) {
		try {
			int length = dataInputstream.readUnsignedShort();
			if (length == 0) {
				return Attribute.NoAttributes;
			}
			Attribute[] attrs = new Attribute[length];
			for (int i = 0; i < length; i++) {
				attrs[i] = Attribute.readAttribute(dataInputstream, cpool);
			}
			return attrs;
		} catch (IOException e) {
			throw new ClassFormatException("IOException whilst reading set of attributes: " + e.toString());
		}
	}

	/** Write (serialize) a set of attributes into a specified output stream */
	public static void writeAttributes(Attribute[] attributes, DataOutputStream file) throws IOException {
		if (attributes == null) {
			file.writeShort(0);
		} else {
			file.writeShort(attributes.length);
			for (Attribute attribute : attributes) {
				attribute.dump(file);
			}
		}
	}

	public static Signature getSignatureAttribute(Attribute[] attributes) {
		for (Attribute attribute : attributes) {
			if (attribute.tag == Constants.ATTR_SIGNATURE) {
				return (Signature) attribute;
			}
		}
		return null;
	}

	public static Code getCodeAttribute(Attribute[] attributes) {
		for (Attribute attribute : attributes) {
			if (attribute.tag == Constants.ATTR_CODE) {
				return (Code) attribute;
			}
		}
		return null;
	}

	public static ExceptionTable getExceptionTableAttribute(Attribute[] attributes) {
		for (Attribute attribute : attributes) {
			if (attribute.tag == Constants.ATTR_EXCEPTIONS) {
				return (ExceptionTable) attribute;
			}
		}
		return null;
	}

	public static ConstantValue getConstantValueAttribute(Attribute[] attributes) {
		for (Attribute attribute : attributes) {
			if (attribute.getTag() == Constants.ATTR_CONSTANT_VALUE) {
				return (ConstantValue) attribute;
			}
		}
		return null;
	}

	public static void accept(Attribute[] attributes, ClassVisitor visitor) {
		for (Attribute attribute : attributes) {
			attribute.accept(visitor);
		}
	}

	public static boolean hasSyntheticAttribute(Attribute[] attributes) {
		for (Attribute attribute : attributes) {
			if (attribute.tag == Constants.ATTR_SYNTHETIC) {
				return true;
			}
		}
		return false;
	}

	public static SourceFile getSourceFileAttribute(Attribute[] attributes) {
		for (Attribute attribute : attributes) {
			if (attribute.tag == Constants.ATTR_SOURCE_FILE) {
				return (SourceFile) attribute;
			}
		}
		return null;
	}

}