org.apache.empire.db.codegen.WriterService Maven / Gradle / Ivy
/*
* 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.
*/
package org.apache.empire.db.codegen;
import java.lang.reflect.Method;
import java.math.BigDecimal;
import java.util.Date;
import java.util.HashSet;
import java.util.Set;
import org.apache.empire.commons.StringUtils;
import org.apache.empire.data.DataType;
import org.apache.empire.db.DBColumn;
import org.apache.empire.db.DBRecord;
import org.apache.empire.db.DBRowSet;
import org.apache.empire.db.DBTable;
import org.apache.empire.db.DBTableColumn;
import org.apache.empire.db.DBView;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This class is used by the velocity templates.
*/
public class WriterService {
private static final Logger log = LoggerFactory.getLogger(WriterService.class);
private final CodeGenConfig config;
private final Set dbrecMethodNames;
public WriterService(CodeGenConfig config)
{
this.dbrecMethodNames = loadDBRecordMethodNames();
this.config = config;
}
/**
* Some g/setters like getState() can conflict with DBRecord
* methods. To check for conflicts, we'll need to know
* the method names.
* @return the DBRecord method's names
*/
private Set loadDBRecordMethodNames()
{
Method[] dbrecMethods = DBRecord.class.getMethods();
Set names = new HashSet(dbrecMethods.length);
for(Method method : dbrecMethods)
{
names.add(method.getName());
}
return names;
}
/**
* Returns the instance name of a table
*/
public String getTableName(DBTable t) {
return StringUtils.toString(config.getTableNamePrefix(), "")
+ deriveAttributeName(t.getName());
}
/**
* Returns the instance name of a view
*/
public String getViewName(DBView v) {
return StringUtils.toString(config.getViewNamePrefix(), "")
+ deriveAttributeName(v.getName());
}
/**
* Returns the instance name of a rowset
*/
public String getRowsetName(DBRowSet r) {
// use same as table
return StringUtils.toString(config.getTableNamePrefix(), "")
+ deriveAttributeName(r.getName());
}
/**
* Returns the instance name of a column
*/
public String getColumnName(DBColumn c) {
return StringUtils.toString(config.getColumnNamePrefix(), "")
+ deriveAttributeName(c.getName());
}
/**
* Returns the java table class name for a given table name.
*/
public String getTableClassName(String tableName)
{
return StringUtils.toString(config.getTableClassPrefix(), "")
+ deriveClassName(tableName)
+ StringUtils.toString(config.getTableClassSuffix(),"");
}
/**
* Returns the java table class name for a given view name.
*/
public String getViewClassName(String viewName)
{
return StringUtils.toString(config.getViewClassPrefix(), "")
+ deriveClassName(viewName)
+ StringUtils.toString(config.getViewClassSuffix(), "");
}
/**
* Returns the java record class name for a given table name.
*
* @param tableName the table name
*/
public String getRecordClassName(String tableName)
{
return deriveClassName(tableName) + "Record";
}
/**
* Returns the "getter" name for a given DBColumn.
* @param column the column
*/
public String getAccessorName(DBColumn column)
{
return deriveAccessorName(column.getName(), getJavaType(column));
}
/**
* Returns the "setter" name for a given DBColumn
* @param column the column
*/
public String getMutatorName(DBColumn column)
{
return deriveMutatorName(column.getName(), getJavaType(column));
}
/**
* Returns the attribute name for a given DBColumn
public String getAttributeName(DBColumn c)
{
return deriveAttributeName(c.getName());
}
*/
/**
* Returns whether the given table uses BigDecimal class or not. Velocity
* uses this information to generate the neccessary import expression.
*
* @param table the table to inspect
*/
public boolean hasBigDecimalField(DBTable table)
{
for (DBColumn column : table.getColumns())
{
if (getJavaType(column) == BigDecimal.class)
{
return true;
}
}
return false;
}
/**
* Returns whether the given table uses Date class or not. Velocity
* uses this information to generate the neccessary import expression.
*
* @param table the table to inspect
*/
public boolean hasDateField(DBTable table)
{
for (DBColumn column : table.getColumns())
{
if (getJavaType(column) == Date.class)
{
return true;
}
}
return false;
}
/**
* Returns whether the given table has a locking column or not.
*
* @param table the table to inspect
*/
public boolean hasLockingColumn(DBTable table)
{
return table.getTimestampColumn() != null;
}
/**
* Returns the corresponding java type of the given empire DataType.
*
* @param column the column to get the type for
*/
public Class getJavaType(DBColumn column)
{
DataType type = getDataType(column);
// We added the attribute of original datatype to AUTOINC columns
// in CodeGenParser.addColumn(). Now we need to use it so that
// the g/setters deal with the right Java type.
// If the original data type was not set as an attribute for some
// reason this will just fall through to the bottom and
// return "Byte[]", so no problem.
if (DataType.AUTOINC.equals(type) && null != column.getAttribute("AutoIncDataType"))
{
type = (DataType)column.getAttribute("AutoIncDataType");
}
// TODO might be better to add this to the enum
// TODO use primitives for non-nullable columns?
switch(type){
case INTEGER:
return Long.class;
case TEXT:
return String.class;
case DATE:
return Date.class;
case DATETIME:
return Date.class;
case CHAR:
return String.class;
case FLOAT:
return Double.class;
case DECIMAL:
return BigDecimal.class;
case BOOL:
return Boolean.class;
case CLOB:
return String.class;
case BLOB:
return Byte[].class;
case UNKNOWN:
return Byte[].class;
default:
log.warn("SQL column type " + type.toString() + " not supported, falling back to byte array.");
return Byte[].class;
}
}
/**
* Returns the empire DataType of the given DBColumn.
*/
public DataType getDataType(DBColumn c)
{
DBTableColumn dbC = (DBTableColumn) c;
return dbC.getDataType();
}
/**
* Returns the default value of the given DBColumn.
*/
public String getDefaultValue(DBColumn c)
{
DBTableColumn dbC = (DBTableColumn) c;
Object val = dbC.getDefaultValue();
if (val == null)
{
return "null";
}
return "\"" + val + "\"";
}
/**
* Derives a java class name from a database table name.
*/
private String deriveClassName(String name)
{
// PreserverCharacterCase
if (config.isPreserverCharacterCase()) {
return name;
}
// Build camel case string
StringBuilder sb = new StringBuilder();
sb.append(Character.toUpperCase(name.charAt(0)));
// Tables might already be camel case. Let's skip this if no '_' anywhere.
/*
if(name.substring(1).indexOf('_') <= 0)
{
if(name.length() > 1)
sb.append(name.substring(1).toLowerCase());
return sb.toString();
}
*/
boolean nextCharacterUppercase = false;
for (int i = 1; i < name.length(); i++)
{
char c = name.charAt(i);
if (c == '_') {
nextCharacterUppercase = true;
continue;
}
if (nextCharacterUppercase)
sb.append(Character.toUpperCase(c));
else
sb.append(Character.toLowerCase(c));
nextCharacterUppercase = false;
}
return sb.toString();
}
/**
* Derives the accessor method name based on the attribute name.
*
* @param attribute
* @param isBoolean
* @return
*/
private String deriveAccessorName(String attribute, Class type)
{
return deriveRecordMethodName(attribute, type, true);
}
/**
* We need to alter both getter and setter if the method name will
* conflict with existing methods DBRecord. This will check both
* so that getter and setter have matching suffixes if one or
* the other conflicts with an existing method.
*/
private String deriveRecordMethodName(String attribute, Class type, boolean isGetter) {
attribute = deriveAttributeName(attribute);
StringBuilder attributeName = new StringBuilder();
attributeName.append(Character.toUpperCase(attribute.charAt(0)));
// convert the method's name to CamelCase
boolean nextCharacterUppercase = false;
for (int i = 1; i < attribute.length(); i++)
{
char c = attribute.charAt(i);
if (c == '_') {
nextCharacterUppercase = true;
continue;
}
if (nextCharacterUppercase)
attributeName.append(Character.toUpperCase(c));
else
attributeName.append(Character.toLowerCase(c));
nextCharacterUppercase = false;
}
StringBuilder sbGet = new StringBuilder(getGetterPrefix(type));
sbGet.append(attributeName);
StringBuilder sbSet = new StringBuilder("set");
sbSet.append(attributeName);
attributeName = isGetter ? sbGet : sbSet;
if(dbrecMethodNames.contains(sbGet.toString()) || dbrecMethodNames.contains(sbSet.toString()))
{
// Any change will resolve the conflict.
attributeName.append("Column");
}
return attributeName.toString();
}
private String getGetterPrefix(Class type){
if (type == boolean.class || type == Boolean.class)
{
return "is";
}
else
{
return "get";
}
}
/**
* Derives the mutator method name based on the attribute name.
*
* @param attribute
* @return
*/
private String deriveMutatorName(String attribute, Class type)
{
return deriveRecordMethodName(attribute, type, false);
}
/**
* Derives the attribute name based on the column name.
*
* @param attribute
* @return
*/
private String deriveAttributeName(String column)
{
return column.replace(' ', '_');
}
}