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feilong is a suite of core and expanded libraries that include utility classes, http, excel,cvs, io classes, and much much more.
package com.feilong.lib.digester3;
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
import static java.lang.String.format;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.xml.sax.Attributes;
import com.feilong.lib.beanutils.MethodUtils;
/**
* Abstract implementation for {@link com.feilong.lib.digester3.SetNextRule},
* {@link com.feilong.lib.digester3.SetRootRule} and {@link com.feilong.lib.digester3.SetTopRule} rules.
*
* @since 3.0
*/
public abstract class AbstractMethodRule extends Rule{
/** The Constant log. */
private static final Logger LOGGER = LoggerFactory.getLogger(AbstractMethodRule.class);
//---------------------------------------------------------------
/**
* 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 paramTypeName = null;
/**
* The Java class name of the parameter type expected by the method.
*/
protected Class paramType;
/**
* Should we use exact matching. Default is no.
*/
protected boolean useExactMatch = false;
/**
* Should this rule be invoked when {@link #begin(String, String, Attributes)} (true)
* or {@link #end(String, String)} (false) methods are invoked, false by default.
*/
protected boolean fireOnBegin = false;
/**
* Construct a "set next" 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 AbstractMethodRule(String methodName){
this(methodName, (String) null);
}
/**
* Construct a "set next" 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 AbstractMethodRule(String methodName, Class paramType){
this(methodName, paramType.getName());
this.paramType = paramType;
}
/**
* Construct a "set next" rule with the specified method name.
*
* @param methodName
* Method name of the parent method to call
* @param paramTypeName
* 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 AbstractMethodRule(String methodName, String paramTypeName){
this.methodName = methodName;
this.paramTypeName = paramTypeName;
}
/**
*
* 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 if exact matching is enabled
* @since Digester Release 1.1.1
*/
public boolean isExactMatch(){
return useExactMatch;
}
/**
* Sets this rule be invoked when {@link #begin(String, String, Attributes)} (true)
* or {@link #end(String, String)} (false) methods are invoked, false by default.
*
* @param fireOnBegin
* flag to mark this rule be invoked when {@link #begin(String, String, Attributes)} (true)
* or {@link #end(String, String)} (false) methods are invoked, false by default.
*/
public void setFireOnBegin(boolean fireOnBegin){
this.fireOnBegin = fireOnBegin;
}
/**
* Returns the flag this rule be invoked when {@link #begin(String, String, Attributes)} (true)
* or {@link #end(String, String)} (false) methods are invoked, false by default.
*
* @return the flag this rule be invoked when {@link #begin(String, String, Attributes)} (true)
* or {@link #end(String, String)} (false) methods are invoked, false by default.
*/
public boolean isFireOnBegin(){
return fireOnBegin;
}
/**
*
* 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;
}
/**
* {@inheritDoc}
*/
@Override
public void begin(String namespace,String name,Attributes attributes) throws Exception{
if (fireOnBegin){
invoke();
}
}
/**
* {@inheritDoc}
*/
@Override
public void end(String namespace,String name) throws Exception{
if (!fireOnBegin){
invoke();
}
}
/**
* Just performs the method execution.
*
* @throws Exception
* if any error occurs.
*/
private void invoke() throws Exception{
// Identify the objects to be used
Object child = getChild();
Object parent = getParent();
if (LOGGER.isDebugEnabled()){
if (parent == null){
LOGGER.debug(
format(
"[%s]{%s} Call [NULL PARENT].%s(%s)",
getClass().getSimpleName(),
getDigester().getMatch(),
methodName,
child));
}else{
LOGGER.debug(
format(
"[%s]{%s} Call %s.%s(%s)",
getClass().getSimpleName(),
getDigester().getMatch(),
parent.getClass().getName(),
methodName,
child));
}
}
// Call the specified method
Class paramTypes[] = new Class[1];
if (paramType != null){
paramTypes[0] = getDigester().getClassLoader().loadClass(paramTypeName);
}else{
paramTypes[0] = child.getClass();
}
if (useExactMatch){
MethodUtils.invokeExactMethod(parent, methodName, new Object[] { child }, paramTypes);
}else{
MethodUtils.invokeMethod(parent, methodName, new Object[] { child }, paramTypes);
}
}
/**
* Returns the argument object of method has to be invoked.
*
* @return the argument object of method has to be invoked.
*/
protected abstract Object getChild();
/**
* Returns the target object of method has to be invoked.
*
* @return the target object of method has to be invoked.
*/
protected abstract Object getParent();
/**
* {@inheritDoc}
*/
@Override
public final String toString(){
return format(
"%s[methodName=%s, paramType=%s, paramTypeName=%s, useExactMatch=%s, fireOnBegin=%s]",
getClass().getSimpleName(),
methodName,
paramType,
paramTypeName,
useExactMatch,
fireOnBegin);
}
}