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JMapper Framework is a java bean mapper based on javassist. JMapper exposes
interesting features as relational mapping, dynamic conversions and more
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/**
* Copyright (C) 2012 - 2016 Alessandro Vurro.
*
* Licensed 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.
*/
package com.googlecode.jmapper.operations;
import static com.googlecode.jmapper.api.enums.MappingType.ONLY_NULL_FIELDS;
import static com.googlecode.jmapper.conversions.implicit.ConversionHandler.getConversion;
import static com.googlecode.jmapper.util.ClassesManager.isBoxing;
import static com.googlecode.jmapper.util.ClassesManager.isUnBoxing;
import static com.googlecode.jmapper.util.GeneralUtility.isCastCase;
import static com.googlecode.jmapper.util.GeneralUtility.isNull;
import static com.googlecode.jmapper.util.GeneralUtility.newLine;
import com.googlecode.jmapper.enums.ConversionType;
import com.googlecode.jmapper.operations.beans.MappedField;
import com.googlecode.jmapper.operations.info.NestedMappedField;
/**
* This abstract class represents an abstract operation that adds,
* to basic mapping, a mapping type control.
*
* @author Alessandro Vurro
*
*/
public abstract class AGeneralOperation extends AGeneralOperationAccessor{
/** @return the nested mapping */
protected StringBuilder getNestedMapping() {
if(isNull(this.nestedMappingInfo))
return null;
return this.nestedMappingInfo.isSource()
? calculateSourceNestedMapping()
: calculateDestinationNestedMapping();
}
private StringBuilder calculateSourceNestedMapping(){
StringBuilder mapping = new StringBuilder();
// this represent the intermediate variables
String actualField = this.initialSGetPath;
int index = 0;
String nestedField = "nestedField"+ ++index;
//TODO creo un try catch intorno all'operazione
// se va in errore vedo se era definito un safeOperator
// se ? definito allora vado a vedere che tipo di mapping type
// del source ho e decido se passare null a destination
// oppure lasciare il valore originario
for (NestedMappedField nestedMappedField : this.nestedMappingInfo.getNestedFields()) {
tryCatch(mapping, nestedField, actualField, nestedMappedField);
// in case of last no mapping necessary, but wrote only for checks null field
if(this.nestedMappingInfo.isLastField(nestedMappedField))
break;
actualField = nestedField;
nestedField = "nestedField" + ++index;
}
//TODO utilizzare questo spezzone per il try catch esterno sopra descritto
// write(mapping, " }catch(",NestedBeanNullException.class.getName(), " e){",
// newLine, " if(!e.isSafeNavigationOperator()){",
// newLine, " throw e;",
// newLine, " }",
// newLine, " }",newLine);
this.initialSGetPath = actualField;
return mapping;
}
private void tryCatch(StringBuilder mapping, String nestedField, String actualField, NestedMappedField nestedMappedField){
MappedField mappedField = nestedMappedField.getField();
boolean safeNavigationOperatorDefined = nestedMappedField.isSafeNavigationOperatorDefined();
Class nestedClass = mappedField.getValue().getType();
String getField = mappedField.getMethod();
String destinationClass = this.nestedMappingInfo.getConfiguredClass().getSimpleName();
String destinationField = this.nestedMappingInfo.getConfiguredField().getName();
String sourceClass = this.nestedMappingInfo.getFirstNestedClass().getSimpleName();
String sourceField = this.nestedMappingInfo.getFirstNestedField().getName();
write(mapping, " ",nestedClass.getName()," ",nestedField," = null;",
newLine, " try{",
newLine, " ",nestedField," = ",actualField,".",getField,"();",
newLine, " }catch(",NullPointerException.class.getName()," e){",
newLine, " com.googlecode.jmapper.config.Error.nestedBeanNull(\"",mappedField.getName(),"\", \"",destinationClass,"\", \"",destinationField,"\", \"",sourceClass,"\", \"",sourceField,"\", ",safeNavigationOperatorDefined,");",
newLine, " }", newLine);
}
private StringBuilder calculateDestinationNestedMapping(){
StringBuilder mapping = new StringBuilder();
// this represent the intermediate variables
String actualField = this.initialDGetPath;
int index = 0;
String nestedField = "nestedField"+ ++index;
for (NestedMappedField nestedMappedField : this.nestedMappingInfo.getNestedFields()) {
// in case of last no mapping necessary
if(this.nestedMappingInfo.isLastField(nestedMappedField))
break;
MappedField field = nestedMappedField.getField();
Class nestedClass = field.getValue().getType();
nestedMapping(mapping, nestedClass, nestedField, actualField, field);
actualField = nestedField;
nestedField = "nestedField" + ++index;
}
this.initialDSetPath = actualField;
this.initialDGetPath = actualField;
return mapping;
}
private void nestedMapping(StringBuilder mapping, Class nestedClass, String nestedField, String actualField, MappedField mappedField){
String getField = mappedField.getMethod();
String setField = mappedField.setMethod();
write(mapping, " ",nestedClass.getName()," ",nestedField," = ",actualField,".",getField,"();",
newLine, " if(", nestedField," == null){",
newLine, " ",nestedField," = new ",nestedClass.getName(),"();",
newLine, " ",actualField,".",setField,"(",nestedField,");",
newLine, " }", newLine);
}
/**
* @return a StringBuilder calculated at runtime representing the complete set destination path.
*
for example: destination.setField;
*/
protected final StringBuilder setDestination() {
return write(initialDSetPath,".",destinationField.setMethod());
}
/**
* Returns a StringBuilder that contains setDestination(content); operation.
* @param content content to set
* @return a StringBuilder with setDestination(content); operation
*/
protected final StringBuilder setDestination(Object content){
return write(" ",setDestination(),"(",content,");");
}
/**
* @return a StringBuilder calculated at runtime representing the complete get destination path.
*
for example: destination.getField()
*/
protected final StringBuilder getDestination() {
return write(initialDGetPath,".",destinationField.getMethod(),"()");
}
/**
* @return a StringBuilder calculated at runtime representing the complete get source path.
*
for example: source.getField()
*/
protected final StringBuilder getSource() {
return write(initialSGetPath,".",sourceField.getMethod(),"()");
}
/**
* this method adds a mapping type control to the basic mapping.
* @param content mapping that will be wrapped with mappingType control
* @return a String that contains a single operation
*/
@SuppressWarnings("incomplete-switch")
protected final StringBuilder addMappingTypeControl(StringBuilder content){
StringBuilder sb = new StringBuilder();
int openBracket = 0;
boolean isDPrimitive = destinationType().isPrimitive();
boolean isSPrimitive = sourceType().isPrimitive();
if(!isDPrimitive && isNullSetting())
content = avoidSet ? write(newLine)
: write(setDestination("null"),newLine);
if( ((isDPrimitive || isSPrimitive) && isNullSetting())
|| ((isDPrimitive && mtd == ONLY_NULL_FIELDS)))
// it's impossible to apply the mapping type requested
return write(newLine);
if(!isDPrimitive)
switch(mtd){case ONLY_VALUED_FIELDS: write(sb," if(",getDestination(),"!=null){",newLine); openBracket++;break;
case ONLY_NULL_FIELDS: write(sb," if(",getDestination(),"==null){",newLine); openBracket++;break;}
if(!isSPrimitive)
if(!isDPrimitive)
switch(mts){case ONLY_VALUED_FIELDS: write(sb," if(",getSource(),"!=null){",newLine); openBracket++;break;
case ONLY_NULL_FIELDS: write(sb," if(",getSource(),"==null){",newLine); openBracket++;break;}
else switch(mts){case ONLY_VALUED_FIELDS: write(sb," if(",getSource(),"!=null){",newLine); openBracket++;break;}
sb.append(content);
while(openBracket-->0) write(sb," }",newLine);
return sb;
}
/**
* @return a StringBuilder calculated at runtime representing the explicit conversion.
*/
protected final StringBuilder applyExplicitConversion(){
// construction of the conversion method path
String conversionMethod = "";
switch (conversionMembership) {
case MAPPER: conversionMethod = conversion.getName(); break;
case DESTINATION: conversionMethod = initialDGetPath +"."+ conversion.getName(); break;
case SOURCE: conversionMethod = initialSGetPath +"."+ conversion.getName(); break;
default: break;
}
switch (conversion.getParameterNumber()) {
case ZERO:return setDestination(conversionMethod+"()");
case ONE: return setDestination(conversionMethod+"("+getSource()+")");
case TWO:
String mapping = conversionMethod+"("+getDestination()+", "+getSource()+")";
return conversion.isAvoidSet()
? new StringBuilder(" "+mapping+";")
: setDestination(mapping);
}
return null;
}
/**
* This method returns the source content modified, analyzing conversion type, destination and source classes.
*
* @param conversionType type of conversion
* @param dClass destination Class
* @param sClass source Class
* @param sourceContent content of source
* @return a string that containts literal conversion
*/
protected final Object applyImplicitConversion(final ConversionType conversionType,final Class dClass,final Class sClass,final Object sourceContent){
if(!conversionType.isAbsent()){
// add conversion
if(!conversionType.isUndefined())
return getConversion(conversionType,sourceContent);
// in case of explicit cast, for example: Integer i = (Integer) object;
if(isCastCase(dClass, sClass))
return write("(",dClass.getName(),")",sourceContent);
// if info is undefined, probably is an autoboxing operation
}else{
// is a boxing operation
if(isBoxing(dClass, sClass))
return write("new ",dClass.getName(),"(",sourceContent,")");
// is an unboxing operation
if(isUnBoxing(dClass, sClass))
return write(sourceContent,".",dClass.getName(),"Value()");
}
return sourceContent;
}
/**
*
* @return true if is a null setting, false otherwise
*/
private boolean isNullSetting(){
return mts == ONLY_NULL_FIELDS;
}
/**
* Returns true if the source is to be converted, false otherwise
* @return true if the source is to be converted, false otherwise
*/
protected boolean theSourceIsToBeConverted(){
return !info.getConversionType().isAbsent();
}
}