org.apache.juneau.swaps.StackTraceElementSwap Maven / Gradle / Ivy

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package org.apache.juneau.swaps;

import java.util.*;

import org.apache.juneau.*;
import org.apache.juneau.swap.*;

/**
 * Transforms {@link StackTraceElement StackTraceElements} to {@code String} objects.
 *
 * 
 * The swap is identical to just calling {@link StackTraceElement#toString()}, but provides the ability to
 * parse the resulting string back into a bean.
 *
 * 
See Also:

 * 	Swaps

 * 
 */
public class StackTraceElementSwap extends ObjectSwap {

	/**
	 * Converts the specified {@link Enumeration} to a {@link List}.
	 */
	@Override /* ObjectSwap */
	public String swap(BeanSession session, StackTraceElement o) {
		return o.toString();
	}

	@Override /* ObjectSwap */
	public StackTraceElement unswap(BeanSession session, String in, ClassMeta hint) {
		String methodName = "", fileName = null;
		int lineNumber = -1;

		if (in == null)
			return null;

		int i = in.indexOf('(');
		if (i != -1) {
			String s = in.substring(i+1, in.lastIndexOf(')'));
			in = in.substring(0, i);
			i = s.indexOf(':');
			if (i != -1) {
				fileName = s.substring(0, i);
				lineNumber = Integer.parseInt(s.substring(i+1));
			} else if ("Native Method".equals(s)) {
				lineNumber = -2;
			} else if (! "Unknown Source".equals(s)) {
				fileName = s;
			}
 		}

		i = in.lastIndexOf('.');
		if (i != -1) {
			methodName = in.substring(i+1);
			in = in.substring(0, i);
		}

		return new StackTraceElement(in, methodName, fileName, lineNumber);
	}
}