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/*
* JQLC.java
*
* Created on March 8, 2000
*/
package com.sun.jdo.spi.persistence.support.sqlstore.query.jqlc;
import java.io.Reader;
import java.io.StringReader;
import java.util.*;
import persistence.antlr.TokenBuffer;
import persistence.antlr.ANTLRException;
import com.sun.jdo.api.persistence.support.JDOQueryException;
import com.sun.jdo.api.persistence.support.JDOUnsupportedOptionException;
import com.sun.jdo.api.persistence.support.JDOFatalInternalException;
import com.sun.jdo.spi.persistence.utility.I18NHelper;
import com.sun.jdo.spi.persistence.utility.StringHelper;
import com.sun.jdo.spi.persistence.support.sqlstore.PersistenceManager;
import com.sun.jdo.spi.persistence.support.sqlstore.RetrieveDesc;
import com.sun.jdo.spi.persistence.support.sqlstore.ExtentCollection;
import com.sun.jdo.spi.persistence.utility.logging.Logger;
import com.sun.jdo.spi.persistence.support.sqlstore.query.util.type.TypeTable;
/**
*
* @author Michael Bouschen
* @version 0.1
*
* Note: this class allows to override its fields even after all the processing
* is done via the corresponding setXXX methods. This is not expected behavior.
* A better solution would be to change all setters to be private and have use
* a constructor to populate all the values. The constructor will call private
* setters to process the arguments.
*/
public class JQLC
{
/** */
protected TypeTable typetab;
/** */
protected ErrorMsg errorMsg;
/** */
protected Class candidateClass;
/** */
protected JQLAST filterAST = null;
/** */
protected JQLAST importsAST = null;
/** */
protected JQLAST varsAST = null;
/** */
protected JQLAST paramsAST = null;
/** */
protected JQLAST orderingAST = null;
/** */
protected JQLAST resultAST = null;
/** */
protected JQLAST queryAST = null;
/** */
private boolean prefetchEnabled;
/**
* RD cache, key is a string build from actual param values
* (see ParameterTable.getKeyForRetrieveDescCache).
* It's ok to use WeakHashMap from java.util, because the key is a string
* which is not referenced by the RD.
*/
protected Map retrieveDescCache = new HashMap();
/** I18N support */
protected final static ResourceBundle messages =
I18NHelper.loadBundle(JQLC.class);
/** The logger */
private static Logger logger = LogHelperQueryCompilerJDO.getLogger();
/**
*
*/
public JQLC()
{
this.errorMsg = new ErrorMsg();
}
/**
*
*/
public void setClass(Class candidateClass)
{
// check valid candidate class definition
if (candidateClass == null)
{
JDOQueryException ex = new JDOQueryException(I18NHelper.getMessage(
messages, "jqlc.jqlc.generic.nocandidateclass")); //NOI18N
logger.throwing("jqlc.JQLC", "setClass", ex); //NOI18N
throw ex;
}
this.candidateClass = candidateClass;
}
/**
*
*/
public void declareImports(String imports)
{
if (imports == null)
{
importsAST = null;
return;
}
try
{
JQLParser parser = createStringParser(imports);
parser.parseImports();
importsAST = (JQLAST)parser.getAST();
}
catch (ANTLRException ex)
{
JQLParser.handleANTLRException(ex, errorMsg);
}
}
/**
*
*/
public void declareParameters(String parameters)
{
if (parameters == null)
{
paramsAST = null;
return;
}
try
{
JQLParser parser = createStringParser(parameters);
parser.parseParameters();
paramsAST = (JQLAST)parser.getAST();
}
catch (ANTLRException ex)
{
JQLParser.handleANTLRException(ex, errorMsg);
}
}
/**
*
*/
public void declareVariables(String variables)
{
if (variables == null)
{
varsAST = null;
return;
}
try
{
JQLParser parser = createStringParser(variables);
parser.parseVariables();
varsAST = (JQLAST)parser.getAST();
}
catch (ANTLRException ex)
{
JQLParser.handleANTLRException(ex, errorMsg);
}
}
/**
*
*/
public void setOrdering(String ordering)
{
if (ordering == null)
{
orderingAST = null;
return;
}
try
{
JQLParser parser = createStringParser(ordering);
parser.parseOrdering();
orderingAST = (JQLAST)parser.getAST();
}
catch (ANTLRException ex)
{
JQLParser.handleANTLRException(ex, errorMsg);
}
}
/**
*
*/
public void setResult(String result)
{
if (result == null)
{
resultAST = null;
return;
}
try
{
JQLParser parser = createStringParser(result);
parser.parseResult();
resultAST = (JQLAST)parser.getAST();
}
catch (ANTLRException ex)
{
JQLParser.handleANTLRException(ex, errorMsg);
}
}
/**
*
*/
public void setFilter(String filter)
{
if (StringHelper.isEmpty(filter))
{
// If there is no filter specified use "true" as filter.
// This is the case if
// - setFilter is not called at all (filter == null)
// - the filter is empty or contians whitespecace only.
// Internally the filter has to be specified,
// otherwise semantic analysis has problems with empty AST.
filter = "true"; //NOI18N
}
try
{
JQLParser parser = createStringParser(filter);
parser.parseFilter();
filterAST = (JQLAST)parser.getAST();
}
catch (ANTLRException ex)
{
JQLParser.handleANTLRException(ex, errorMsg);
}
}
/**
*
*/
public void setPrefetchEnabled(boolean prefetchEnabled)
{
this.prefetchEnabled = prefetchEnabled;
}
/**
*
*/
public void semanticCheck(ParameterTable paramtab)
{
boolean finer = logger.isLoggable(Logger.FINER);
boolean finest = logger.isLoggable(Logger.FINEST);
this.typetab = TypeTable.getInstance(candidateClass.getClassLoader());
paramtab.init();
Semantic semantic = new Semantic();
semantic.init(typetab, paramtab, errorMsg);
semantic.setASTFactory(JQLAST.Factory.getInstance());
// create complete tree representation
JQLAST classAST = semantic.checkCandidateClass(candidateClass);
queryAST = semantic.createQueryAST(classAST, importsAST, paramsAST, varsAST,
orderingAST, resultAST, filterAST);
if (finest) logger.finest("LOG_JQLCDumpTree", queryAST.getTreeRepr("(AST)")); //NOI18N
// start semantic check
try
{
if (finer) logger.finer("LOG_JQLCStartPass", "semantic analysis"); //NOI18N
semantic.query(queryAST);
queryAST = (JQLAST)semantic.getAST();
if (finest) logger.finest("LOG_JQLCDumpTree", queryAST.getTreeRepr("(typed AST)")); //NOI18N
}
catch (ANTLRException ex)
{
errorMsg.fatal("JQLC.semanticCheck unexpected exception", ex); //NOI18N
}
}
/**
*
*/
public RetrieveDesc codeGen(PersistenceManager pm, ParameterTable paramtab)
{
boolean finer = logger.isLoggable(Logger.FINER);
boolean finest = logger.isLoggable(Logger.FINEST);
RetrieveDesc rd = null;
// check if a RetrieveDescriptor for the actual parameter constellation
// is already available in the cache
String key = paramtab.getKeyForRetrieveDescCache();
synchronized(retrieveDescCache)
{
if (key != null)
rd = (RetrieveDesc)retrieveDescCache.get(key);
if (rd == null) {
Optimizer optimizer = new Optimizer();
optimizer.init(typetab, paramtab, errorMsg);
optimizer.setASTFactory(JQLAST.Factory.getInstance());
CodeGeneration codeGen = new CodeGeneration();
codeGen.init(pm, typetab, paramtab, errorMsg, prefetchEnabled);
codeGen.setASTFactory(JQLAST.Factory.getInstance());
try
{
JQLAST ast = queryAST;
// The optimizer should treat query parameters as constant values,
// so I cannot call the optimzer before the query parameter values
// are known. That's why optimization is part of codeGen which is
// called by Query.execute and not called by Query.compile.
if (finer) logger.finer("LOG_JQLCStartPass", "optimizer"); //NOI18N
optimizer.query(ast);
// Do not store the optimizer result in the instance variable queryAST,
// it cannot be reused by the next execution of this query. The next execute
// might have different query parameter values, so the optimized AST is different.
ast = (JQLAST)optimizer.getAST();
if (finest) logger.finest("LOG_JQLCDumpTree", ast.getTreeRepr("(optimized AST)")); //NOI18N
if (finer) logger.finer("LOG_JQLCStartPass", "code generation"); //NOI18N
codeGen.query(ast);
rd = codeGen.getRetrieveDesc();
// add the current RetrieveDescriptor to the cache,
// if the key is not null
if (key != null)
retrieveDescCache.put(key, rd);
}
catch (ANTLRException ex)
{
errorMsg.fatal("JQLC.codeGen unexpected exception", ex); //NOI18N
}
}
else {
if (finer) logger.finest("LOG_JQLCReuseRetrieveDesc"); //NOI18N
}
}
return rd;
}
/**
*
*/
public void checkCandidates(Class candidateClass, Collection candidateCollection)
{
if (candidateClass == null)
throw new JDOQueryException(
I18NHelper.getMessage(messages, "jqlc.jqlc.generic.nocandidateclass")); //NOI18N
if (!(candidateCollection instanceof ExtentCollection))
throw new JDOUnsupportedOptionException(
I18NHelper.getMessage(messages, "jqlc.jqlc.checkcandidates.memorycollection")); //NOI18N
Class candidatePCClass = ((ExtentCollection)candidateCollection).getPersistenceCapableClass();
if (candidatePCClass == null)
throw new JDOFatalInternalException(
I18NHelper.getMessage(messages, "jqlc.jqlc.checkcandidates.nullpc")); //NOI18N
if (!candidateClass.getName().equals(candidatePCClass.getName()))
throw new JDOQueryException(
I18NHelper.getMessage(messages, "jqlc.jqlc.checkcandidates.mismatch", candidateClass.getName())); //NOI18N
}
/** */
private JQLParser createStringParser(String text)
{
return createStringParser(text, errorMsg);
}
/**
* Returns a JQLParser instance parsing the specified text.
*/
public static JQLParser createStringParser(String text, ErrorMsg errorMsg)
{
Reader in = new StringReader(text);
JQLLexer lexer = new JQLLexer(in);
lexer.init(errorMsg);
TokenBuffer buffer = new TokenBuffer(lexer);
JQLParser parser = new JQLParser(buffer);
parser.init(errorMsg);
parser.setASTFactory(JQLAST.Factory.getInstance());
return parser;
}
}
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