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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) 2003, 2017 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.osgi.internal.serviceregistry;

import java.lang.reflect.Array;
import java.util.*;
import org.eclipse.osgi.framework.util.CaseInsensitiveDictionaryMap;
import org.eclipse.osgi.internal.messages.Msg;
import org.eclipse.osgi.util.NLS;
import org.osgi.framework.Constants;

/**
 * Service properties.
 *
 * Supports case-insensitive key lookup.
 */
class ServiceProperties extends CaseInsensitiveDictionaryMap {
	/**
	 * Create a properties object from a Dictionary.
	 *
	 * @param props The properties for this service.
	 * @throws IllegalArgumentException If a case-variants of a key are
	 * in the props parameter.
	 */
	ServiceProperties(Dictionary props) {
		this(props, 0);
	}

	/**
	 * Create a properties object from a Dictionary.
	 *
	 * @param props The properties for this service.
	 * @param extra Extra capacity in the map.
	 * @throws IllegalArgumentException If a case-variants of a key are
	 * in the props parameter.
	 */
	ServiceProperties(Dictionary props, int extra) {
		super(initialCapacity((props == null) ? extra : props.size() + extra));
		if (props == null) {
			return;
		}
		synchronized (props) {
			Enumeration keysEnum = props.keys();
			while (keysEnum.hasMoreElements()) {
				Object key = keysEnum.nextElement();
				if (key instanceof String) {
					String header = (String) key;
					Object value = cloneValue(props.get(header));
					if (value != null && put(header, value) != null) {
						throw new IllegalArgumentException(NLS.bind(Msg.HEADER_DUPLICATE_KEY_EXCEPTION, key));
					}
				}
			}
		}
	}

	/**
	 * Create a properties object from a Map.
	 *
	 * @param props The properties for this service.
	 * @throws IllegalArgumentException If a case-variants of a key are
	 * in the props parameter.
	 */
	ServiceProperties(Map props) {
		super(initialCapacity((props == null) ? 0 : props.size()));
		if (props == null) {
			return;
		}
		synchronized (props) {
			for (Entry e : props.entrySet()) {
				Object key = e.getKey();
				if (key instanceof String) {
					String header = (String) key;
					Object value = cloneValue(props.get(header));
					if (value != null && put(header, value) != null) {
						throw new IllegalArgumentException(NLS.bind(Msg.HEADER_DUPLICATE_KEY_EXCEPTION, key));
					}
				}
			}
		}
	}

	/**
	 * Attempt to clone the value if necessary and possible.
	 *
	 * For some strange reason, you can test to see if an Object is
	 * Cloneable but you can't call the clone method since it is
	 * protected on Object!
	 *
	 * @param value object to be cloned.
	 * @return cloned object or original object if we didn't clone it.
	 */
	static Object cloneValue(Object value) {
		if (value == null)
			return null;
		if (value instanceof String) /* shortcut String */
			return value;
		if (value instanceof Number) /* shortcut Number */
			return value;
		if (value instanceof Character) /* shortcut Character */
			return value;
		if (value instanceof Boolean) /* shortcut Boolean */
			return value;

		Class clazz = value.getClass();
		if (clazz.isArray()) {
			// Do an array copy
			Class type = clazz.getComponentType();
			int len = Array.getLength(value);
			Object clonedArray = Array.newInstance(type, len);
			System.arraycopy(value, 0, clonedArray, 0, len);
			return clonedArray;
		}

		if (value instanceof Cloneable) {
			// must use reflection because Object clone method is protected!!
			try {
				return clazz.getMethod("clone", (Class[]) null).invoke(value, (Object[]) null); //$NON-NLS-1$
			} catch (Exception e) {
				/* clone is not a public method on value's class */
			}
		}
		return value;
	}

	@Override
	public String toString() {
		Set keys = keySet();

		StringBuilder sb = new StringBuilder(20 * keys.size());

		sb.append('{');

		int n = 0;
		for (String key : keys) {
			if (!key.equals(Constants.OBJECTCLASS)) {
				if (n > 0)
					sb.append(", "); //$NON-NLS-1$

				sb.append(key);
				sb.append('=');
				Object value = get(key);
				if (value.getClass().isArray()) {
					sb.append('[');
					int length = Array.getLength(value);
					for (int j = 0; j < length; j++) {
						if (j > 0)
							sb.append(',');
						sb.append(Array.get(value, j));
					}
					sb.append(']');
				} else {
					sb.append(value);
				}
				n++;
			}
		}

		sb.append('}');

		return sb.toString();
	}
}