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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) 1999-2001 Xerox Corporation,
 *               2002 Palo Alto Research Center, Incorporated (PARC).
 * All rights reserved.
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Public License v 2.0
 * which accompanies this distribution and is available at
 * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.txt
 *
 * Contributors:
 *     Xerox/PARC     initial implementation
 * ******************************************************************/


package org.aspectj.runtime.internal;

public final class Conversions {
	// Can't make instances of me
	private Conversions() {}

	// we might want to keep a cache of small integers around
	public static Object intObject(int i) {
		return i;
	}
	public static Object shortObject(short i) {
		return i;
	}
	public static Object byteObject(byte i) {
		return i;
	}
	public static Object charObject(char i) {
		return i;
	}
	public static Object longObject(long i) {
		return i;
	}
	public static Object floatObject(float i) {
		return i;
	}
	public static Object doubleObject(double i) {
		return i;
	}
	public static Object booleanObject(boolean i) {
		return i;
	}
	public static Object voidObject() {
		return null;
	}


	public static int intValue(Object o) {
		if (o == null) {
			return 0;
		} else if (o instanceof Number) {
			return ((Number)o).intValue();
		} else {
			throw new ClassCastException(o.getClass().getName() +
					" can not be converted to int");
		}
	}
	public static long longValue(Object o) {
		if (o == null) {
			return 0;
		} else if (o instanceof Number) {
			return ((Number)o).longValue();
		} else {
			throw new ClassCastException(o.getClass().getName() +
					" can not be converted to long");
		}
	}
	public static float floatValue(Object o) {
		if (o == null) {
			return 0;
		} else if (o instanceof Number) {
			return ((Number)o).floatValue();
		} else {
			throw new ClassCastException(o.getClass().getName() +
					" can not be converted to float");
		}
	}
	public static double doubleValue(Object o) {
		if (o == null) {
			return 0;
		} else if (o instanceof Number) {
			return ((Number)o).doubleValue();
		} else {
			throw new ClassCastException(o.getClass().getName() +
					" can not be converted to double");
		}
	}
	public static byte byteValue(Object o) {
		if (o == null) {
			return 0;
		} else if (o instanceof Number) {
			return ((Number)o).byteValue();
		} else {
			throw new ClassCastException(o.getClass().getName() +
					" can not be converted to byte");
		}
	}
	public static short shortValue(Object o) {
		if (o == null) {
			return 0;
		} else if (o instanceof Number) {
			return ((Number)o).shortValue();
		} else {
			throw new ClassCastException(o.getClass().getName() +
					" can not be converted to short");
		}
	}
	public static char charValue(Object o) {
		if (o == null) {
			return 0;
		} else if (o instanceof Character) {
			return (Character) o;
		} else {
			throw new ClassCastException(o.getClass().getName() +
					" can not be converted to char");
		}
	}
	public static boolean booleanValue(Object o) {
		if (o == null) {
			return false;
		} else if (o instanceof Boolean) {
			return (Boolean) o;
		} else {
			throw new ClassCastException(o.getClass().getName() +
					" can not be converted to boolean");
		}
	}

	// identity function for now.  This is not typed to "void" because we happen
	// to know that in Java, any void context (i.e., {@link ExprStmt})
	// can also handle a return value.
	public static Object voidValue(Object o) {
		if (o == null) {
			return o;
		} else {
			// !!! this may be an error in the future
			return o;
		}
	}
}