org.springframework.core: public class: LocalVariableTableParameterNameDiscoverer

org.springframework.core
public class: LocalVariableTableParameterNameDiscoverer [javadoc | source]

java.lang.Object
   org.springframework.core.LocalVariableTableParameterNameDiscoverer

All Implemented Interfaces:
ParameterNameDiscoverer

Implementation of ParameterNameDiscoverer that uses the LocalVariableTable information in the method attributes to discover parameter names. Returns null if the class file was compiled without debug information.

Uses ObjectWeb's ASM library for analyzing class files. Each discoverer instance caches the ASM ClassReader for each introspected Class, in a thread-safe manner. It is recommended to reuse discoverer instances as far as possible.

author: Adrian - Colyer

author: Juergen - Hoeller

since: 2.0 -

Method from org.springframework.core.LocalVariableTableParameterNameDiscoverer Summary:
getParameterNames, getParameterNames

Methods from java.lang.Object:
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method from org.springframework.core.LocalVariableTableParameterNameDiscoverer Detail:
public String[] getParameterNames(Method method) { String[] paramNames = (String[]) this.parameterNamesCache.get(method); if (paramNames == null) { try { paramNames = visitMethod(method).getParameterNames(); if (paramNames != null) { this.parameterNamesCache.put(method, paramNames); } } catch (IOException ex) { // We couldn't load the class file, which is not fatal as it // simply means this method of discovering parameter names won't work. if (logger.isDebugEnabled()) { logger.debug("IOException whilst attempting to read '.class' file for class [" + method.getDeclaringClass().getName() + "] - unable to determine parameter names for method: " + method, ex); } } } return paramNames; }
public String[] getParameterNames(Constructor ctor) { String[] paramNames = (String[]) this.parameterNamesCache.get(ctor); if (paramNames == null) { try { paramNames = visitConstructor(ctor).getParameterNames(); if (paramNames != null) { this.parameterNamesCache.put(ctor, paramNames); } } catch (IOException ex) { // We couldn't load the class file, which is not fatal as it // simply means this method of discovering parameter names won't work. if (logger.isDebugEnabled()) { logger.debug("IOException whilst attempting to read '.class' file for class [" + ctor.getDeclaringClass().getName() + "] - unable to determine parameter names for constructor: " + ctor, ex); } } } return paramNames; }

Method from org.springframework.core.LocalVariableTableParameterNameDiscoverer Detail:

 public String[] getParameterNames(Method method) {
	    
		String[] paramNames = (String[]) this.parameterNamesCache.get(method);
		if (paramNames == null) {
			try {
				paramNames = visitMethod(method).getParameterNames();
				if (paramNames != null) {
					this.parameterNamesCache.put(method, paramNames);
				}
			}
			catch (IOException ex) {
				// We couldn't load the class file, which is not fatal as it
				// simply means this method of discovering parameter names won't work.
				if (logger.isDebugEnabled()) {
					logger.debug("IOException whilst attempting to read '.class' file for class [" +
							method.getDeclaringClass().getName() +
							"] - unable to determine parameter names for method: " + method, ex);
				}
			}
		}
		return paramNames;
}

 public String[] getParameterNames(Constructor ctor) {
		String[] paramNames = (String[]) this.parameterNamesCache.get(ctor);
		if (paramNames == null) {
			try {
				paramNames = visitConstructor(ctor).getParameterNames();
				if (paramNames != null) {
					this.parameterNamesCache.put(ctor, paramNames);
				}
			}
			catch (IOException ex) {
				// We couldn't load the class file, which is not fatal as it
				// simply means this method of discovering parameter names won't work.
				if (logger.isDebugEnabled()) {
					logger.debug("IOException whilst attempting to read '.class' file for class [" +
							ctor.getDeclaringClass().getName() +
							"] - unable to determine parameter names for constructor: " + ctor, ex);
				}
			}
		}
		return paramNames;
}