hammant 01/11/01 01:22:01
Added: apps/db/src/java/org/apache/avalon/db/bcel/parser
BaseBCELParser.java
Log:
Split of BCEL parser into parent class and SQL impl
Revision Changes Path
1.1
jakarta-avalon-cornerstone/apps/db/src/java/org/apache/avalon/db/bcel/parser/BaseBCELParser.java
Index: BaseBCELParser.java
===================================================================
/*
* Copyright (C) The Apache Software Foundation. All rights reserved.
*
* This software is published under the terms of the Apache Software License
* version 1.1, a copy of which has been included with this distribution in
* the LICENSE file.
*/
package org.apache.avalon.db.bcel.parser;
import org.apache.avalon.db.services.SQLParser;
import org.apache.avalon.db.services.DatabasePersistor;
import org.apache.avalon.db.actions.Action;
import org.apache.avalon.db.actions.Select;
import org.apache.avalon.db.actions.CreateTable;
import org.apache.avalon.db.actions.Insert;
import org.apache.avalon.db.transport.Request;
import org.apache.avalon.db.transport.SelectRequest;
import org.apache.avalon.db.transport.CreateTableRequest;
import org.apache.avalon.db.transport.InsertRequest;
import org.apache.avalon.db.bcel.actions.BCELCreateTable;
import org.apache.avalon.db.bcel.actions.BCELInsertSingleValue;
import org.apache.avalon.db.bcel.data.BCELTable;
import org.apache.avalon.db.data.Table;
import org.apache.avalon.db.data.Column;
import org.apache.avalon.db.data.impl.DefaultColumn;
import org.apache.avalon.phoenix.Block;
import org.apache.avalon.framework.context.Contextualizable;
import org.apache.avalon.framework.context.Context;
import org.apache.avalon.framework.context.ContextException;
import org.apache.avalon.framework.component.Composable;
import org.apache.avalon.framework.component.ComponentManager;
import org.apache.avalon.framework.component.ComponentException;
import org.apache.avalon.framework.configuration.Configurable;
import org.apache.avalon.framework.configuration.Configuration;
import org.apache.avalon.framework.configuration.ConfigurationException;
import org.apache.avalon.framework.activity.Initializable;
import org.apache.avalon.framework.logger.AbstractLoggable;
import org.apache.bcel.Constants;
import org.apache.bcel.generic.ConstantPoolGen;
import org.apache.bcel.generic.Type;
import org.apache.bcel.generic.ClassGen;
import org.apache.bcel.generic.FieldGen;
import org.apache.bcel.generic.InstructionList;
import org.apache.bcel.generic.MethodGen;
import org.apache.bcel.classfile.Field;
import java.util.StringTokenizer;
import java.util.Vector;
import java.util.HashMap;
/**
* Class BCELSQLParser
*
*
* @author Paul Hammant <a href="mailto:[EMAIL PROTECTED]">[EMAIL
PROTECTED]</a>
* @version $Revision: 1.1 $
*/
public abstract class BaseBCELParser extends AbstractLoggable
implements Block, SQLParser, Contextualizable, Composable,
Configurable, Initializable {
protected DatabasePersistor mDatabasePersistor;
protected GeneratedObjectClassLoader mGenClassLoader = new
GeneratedObjectClassLoader();
protected static int mGenObjSeq;
protected HashMap mGeneratedObjTranslation = new HashMap();
/**
* Method createAction
*
*
* @param request
*
* @return
*
*/
public Action createAction(Request request) {
return null;
}
/**
* Method contextualize
*
*
* @param context
*
* @throws ContextException
*
*/
public void contextualize(Context context) throws ContextException {}
/**
* Method compose
*
*
* @param componentManager
*
* @throws ComponentException
*
*/
public void compose(ComponentManager componentManager) throws
ComponentException {
mDatabasePersistor =
(DatabasePersistor)
componentManager.lookup(DatabasePersistor.class.getName());
}
/**
* Method configure
*
*
* @param configuration
*
* @throws ConfigurationException
*
*/
public void configure(Configuration configuration) throws
ConfigurationException {}
/**
* Method initialize
*
*
* @throws Exception
*
*/
public void initialize() throws Exception {}
/**
* Method createSelectAction
*
*
* @param request
*
* @return
*
*/
public Select createSelectAction(SelectRequest request) {
return null;
}
protected String getWordOne(String str) {
int ix0 = str.indexOf(' ');
if (ix0 == -1) {
ix0 = str.length();
}
return str.substring(0, ix0);
}
protected String getWordTwo(String str) {
int ix0 = str.indexOf(' ');
int ix1 = str.indexOf(' ', ix0 + 1);
if (ix1 == -1) {
ix1 = str.length();
}
return str.substring(ix0 + 1, ix1);
}
protected String getWordThree(String str) {
int ix0 = str.indexOf(' ');
int ix1 = str.indexOf(' ', ix0 + 1);
int ix2 = str.indexOf(' ', ix1 + 1);
if (ix2 == -1) {
ix2 = str.length();
}
return str.substring(ix1 + 1, ix2);
}
protected String getWordFour(String str) {
int ix0 = str.indexOf(' ');
int ix1 = str.indexOf(' ', ix0 + 1);
int ix2 = str.indexOf(' ', ix1 + 1);
int ix3 = str.indexOf(' ', ix2 + 1);
if (ix3 == -1) {
ix3 = str.length();
}
return str.substring(ix2 + 1, ix3);
}
protected String getBracketedExpr(String str) {
int ix0 = str.indexOf('(');
int ix1 = str.lastIndexOf(')');
System.out.println("str=" + str);
System.out.println("ix0=" + ix0);
System.out.println("ix1=" + ix1);
return str.substring(ix0 + 1, ix1);
}
protected Type getType(String type) {
System.out.println("Type=(" + type + ")");
if (type.equals("varchar")) {
return Type.STRING;
} else if (type.equals("char")) {
return Type.STRING;
}
return Type.VOID;
}
protected void createField(ConstantPoolGen cp, ClassGen cg, Type
fieldType, String name) {
System.out.println("fn=" + name);
System.out.println("Type2=" + fieldType);
FieldGen fg = new FieldGen(Constants.ACC_PUBLIC, fieldType, name, cp);
cg.addField(fg.getField());
}
protected void createSetter(ConstantPoolGen cp, ClassGen cg, Type
fieldType, String name,
String table) {
InstructionList il = new InstructionList();
MethodGen mg = new MethodGen(Constants.ACC_PUBLIC, // access flags
Type.VOID, // return type
new Type[]{ fieldType }, new String[]{
"value" }, // arg names
"set" + name, table, // method, class
il, cp);
mg.stripAttributes(true);
mg.setMaxStack();
mg.setMaxLocals();
cg.addMethod(mg.getMethod());
}
//private Insert createNamedColumnsInsert(Table table, String sql ) {
//}
protected Insert createAllValuesInsert(Table table, String sql) {
String values = getBracketedExpr(sql);
StringTokenizer st = new StringTokenizer(values, ",");
Vector valuesVec = new Vector();
while (st.hasMoreTokens()) {
valuesVec.add(st.nextToken().trim());
}
//TODO get columns from table.
return new BCELInsertSingleValue(table, null, valuesVec);
}
//private Insert createSelectInsert(Table table, String sql) {
//}
public void addGeneratedClass(String name, byte[] bytes) {
mGenClassLoader.addGeneratedClass(name, bytes);
}
public Object getGeneratedInstance(String name) {
return mGenClassLoader.getGeneratedInstance(name);
}
public Class getGeneratedClass(String name) {
return mGenClassLoader.findClass(name);
}
public String createUniqueClassName(String sqlObjectName){
String className = "gen.A" + mGenObjSeq++;
mGeneratedObjTranslation.put(sqlObjectName, className);
return className;
}
public String getGeneratedClassName(String sqlObjectName){
return (String) mGeneratedObjTranslation.get(sqlObjectName);
}
}
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