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package org.apache.tomcat.util.digester;
import org.glassfish.web.util.IntrospectionUtils;
import java.util.logging.Level;
/**
* Rule implementation that calls a method on the root object on the stack,
* passing the top object (child) as an argument.
* It is important to remember that this rule acts on end.
*
* This rule now supports more flexible method matching by default.
* It is possible that this may break (some) code
* written against release 1.1.1 or earlier.
* See {@link #isExactMatch()} for more details.
*/
public class SetRootRule extends Rule {
// ----------------------------------------------------------- Constructors
/**
* Construct a "set root" rule with the specified method name. The
* method's argument type is assumed to be the class of the
* child object.
*
* @param digester The associated Digester
* @param methodName Method name of the parent method to call
*
* @deprecated The digester instance is now set in the {@link Digester#addRule} method.
* Use {@link #SetRootRule(String methodName)} instead.
*/
public SetRootRule(Digester digester, String methodName) {
this(methodName);
}
/**
* Construct a "set root" rule with the specified method name.
*
* @param digester The associated Digester
* @param methodName Method name of the parent method to call
* @param paramType Java class of the parent method's argument
* (if you wish to use a primitive type, specify the corresonding
* Java wrapper class instead, such as java.lang.Boolean
* for a boolean parameter)
*
* @deprecated The digester instance is now set in the {@link Digester#addRule} method.
* Use {@link #SetRootRule(String methodName,String paramType)} instead.
*/
public SetRootRule(Digester digester, String methodName,
String paramType) {
this(methodName, paramType);
}
/**
* Construct a "set root" rule with the specified method name. The
* method's argument type is assumed to be the class of the
* child object.
*
* @param methodName Method name of the parent method to call
*/
public SetRootRule(String methodName) {
this(methodName, null);
}
/**
* Construct a "set root" rule with the specified method name.
*
* @param methodName Method name of the parent method to call
* @param paramType Java class of the parent method's argument
* (if you wish to use a primitive type, specify the corresonding
* Java wrapper class instead, such as java.lang.Boolean
* for a boolean parameter)
*/
public SetRootRule(String methodName,
String paramType) {
this.methodName = methodName;
this.paramType = paramType;
}
// ----------------------------------------------------- Instance Variables
/**
* The method name to call on the parent object.
*/
protected String methodName = null;
/**
* The Java class name of the parameter type expected by the method.
*/
protected String paramType = null;
/**
* Should we use exact matching. Default is no.
*/
protected boolean useExactMatch = false;
// --------------------------------------------------------- Public Methods
/**
* Is exact matching being used.
*
* This rule uses org.apache.commons.beanutils.MethodUtils
* to introspect the relevent objects so that the right method can be called.
* Originally, MethodUtils.invokeExactMethod was used.
* This matches methods very strictly
* and so may not find a matching method when one exists.
* This is still the behaviour when exact matching is enabled.
*
* When exact matching is disabled, MethodUtils.invokeMethod is used.
* This method finds more methods but is less precise when there are several methods
* with correct signatures.
* So, if you want to choose an exact signature you might need to enable this property.
*
* The default setting is to disable exact matches.
*
* @return true iff exact matching is enabled
* @since Digester Release 1.1.1
*/
public boolean isExactMatch() {
return useExactMatch;
}
/**
* Set whether exact matching is enabled.
*
* See {@link #isExactMatch()}.
*
* @param useExactMatch should this rule use exact method matching
* @since Digester Release 1.1.1
*/
public void setExactMatch(boolean useExactMatch) {
this.useExactMatch = useExactMatch;
}
/**
* Process the end of this element.
*/
public void end() throws Exception {
// Identify the objects to be used
Object child = digester.peek(0);
Object parent = digester.root;
if (digester.log.isLoggable(Level.FINE)) {
if (parent == null) {
digester.log.log(Level.FINE, "[SetRootRule]{" + digester.match +
"} Call [NULL ROOT]." +
methodName + "(" + child + ")");
} else {
digester.log.log(Level.FINE, "[SetRootRule]{" + digester.match +
"} Call " + parent.getClass().getName() + "." +
methodName + "(" + child + ")");
}
}
// Call the specified method
IntrospectionUtils.callMethod1(parent, methodName,
child, paramType, digester.getClassLoader());
}
/**
* Render a printable version of this Rule.
*/
public String toString() {
StringBuilder sb = new StringBuilder("SetRootRule[");
sb.append("methodName=");
sb.append(methodName);
sb.append(", paramType=");
sb.append(paramType);
sb.append("]");
return (sb.toString());
}
}