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/*
* QueryPlan.java
*
* Created on March 3, 2000
*
*/
package com.sun.jdo.spi.persistence.support.sqlstore.sql.generator;
import org.netbeans.modules.dbschema.TableElement;
import com.sun.jdo.api.persistence.support.JDOFatalInternalException;
import com.sun.jdo.spi.persistence.support.sqlstore.ActionDesc;
import com.sun.jdo.spi.persistence.support.sqlstore.SQLStoreManager;
import com.sun.jdo.spi.persistence.support.sqlstore.model.ClassDesc;
import com.sun.jdo.spi.persistence.support.sqlstore.model.ReferenceKeyDesc;
import com.sun.jdo.spi.persistence.support.sqlstore.model.TableDesc;
import com.sun.jdo.spi.persistence.utility.I18NHelper;
import java.util.ArrayList;
import java.util.ResourceBundle;
/**
* This class is used to generate SQL statements.
*/
public abstract class QueryPlan {
public static final int ACT_UPDATE = 1;
public static final int ACT_INSERT = 2;
public static final int ACT_DELETE = 3;
public static final int ACT_SELECT = 4;
public static final int ACT_NOOP = 5;
protected static final int ST_BUILT = 0x1;
/** Array of Statement. */
public ArrayList statements;
protected ClassDesc config;
/**
* Bitmask containing one of {@link QueryPlan#ST_BUILT},
* {@link SelectQueryPlan#ST_C_BUILT}, {@link SelectQueryPlan#ST_OC_BUILT},
* {@link SelectQueryPlan#ST_JOINED}
*/
protected int status;
protected int action;
protected SQLStoreManager store;
/** Array of QueryTable. */
protected ArrayList tables;
/** I18N message handler. */
protected final static ResourceBundle messages = I18NHelper.loadBundle(
"com.sun.jdo.spi.persistence.support.sqlstore.Bundle", // NOI18N
QueryPlan.class.getClassLoader());
public QueryPlan(ActionDesc desc, SQLStoreManager store) {
this.tables = new ArrayList();
this.statements = new ArrayList();
this.store = store;
this.config = (ClassDesc) store.getPersistenceConfig(desc.getPersistenceCapableClass());
}
public QueryTable addQueryTable(TableDesc tableDesc) {
QueryTable table = new QueryTable(tableDesc);
tables.add(table);
table.setTableIndex(new TableIndex(tables.size() - 1));
return table;
}
/**
* Identifies a database table which will become part of this
* query plan. We will build a QueryTable object describing its
* use and return it.
*
* Note: No join is constructed at this point for the table added.
*
* @param tableElement Identifies which table is being added.
* @param persistenceConfig
* If we are adding a foreign table the persistenceConfig parameter
* holds the PersistenceConfig for the foreign Persistence Class.
*/
public QueryTable addQueryTable(TableElement tableElement,
ClassDesc persistenceConfig) {
ClassDesc _config = (persistenceConfig == null) ? this.config : persistenceConfig;
TableDesc tableDesc = _config.findTableDesc(tableElement);
if (tableDesc == null) {
if (tableElement != null) {
throw new JDOFatalInternalException(I18NHelper.getMessage(messages,
"core.configuration.classnotmappedtotable", // NOI18N
_config.getPersistenceCapableClass().getName(),
tableElement.getName().getName()));
} else {
throw new JDOFatalInternalException(I18NHelper.getMessage(messages,
"core.configuration.classnotmapped", // NOI18N
_config.getPersistenceCapableClass().getName()));
}
}
return addQueryTable(tableDesc);
}
/**
* Add all the tables from <code>queryTables</code> to the current
* query plan. Useful when transfering tables when joining query plans
* together.
*
* @param queryTables Query tables from the foreign plan to be added.
*/
public void addQueryTables(ArrayList queryTables) {
for (int i = 0; i < queryTables.size(); i++) {
QueryTable t = (QueryTable) queryTables.get(i);
if (tables.indexOf(t) == -1) {
tables.add(t);
t.getTableIndex().setValue(tables.size() - 1);
}
}
}
/**
* Finds the QueryTable object that this query plan is using
* to describe the TableElement indicated by the tableElement parameter.
*/
public QueryTable findQueryTable(TableElement tableElement) {
for (int i = 0; i < tables.size(); i++) {
QueryTable t = (QueryTable) tables.get(i);
if (t.getTableDesc().getTableElement() == tableElement) {
//if (t.getTableDesc().getTableElement().equals(tableElement)) {
return t;
}
}
return null;
}
/**
* Finds the QueryTable object that this query plan is using
* to describe the TableDesc indicated by the tableDesc parameter.
*/
public QueryTable findQueryTable(TableDesc tableDesc) {
for (int i = 0; i < tables.size(); i++) {
QueryTable t = (QueryTable) tables.get(i);
if (t.getTableDesc() == tableDesc) return t;
}
return null;
}
public ArrayList getStatements() {
for (int i = 0; i < statements.size(); i++) {
Statement s = (Statement) statements.get(i);
//Initialize sql text of the statement
s.getText();
}
return statements;
}
protected Statement addStatement(QueryTable t) {
Statement s = createStatement(t);
statements.add(s);
return s;
}
protected abstract Statement newStatement();
protected Statement createStatement(QueryTable t) {
Statement statement = newStatement();
statement.action = action;
statement.addQueryTable(t);
return statement;
}
protected Statement getStatement(QueryTable t) {
if (t == null) return null;
for (int i = 0; i < statements.size(); i++) {
Statement s = (Statement) statements.get(i);
if (s.tableList.indexOf(t) != -1)
return s;
}
return null;
}
public abstract void build();
/**
* This method goes through the statement list and tries to set up relationship
* between statements based on secondary table keys.
*/
protected void processStatements() {
for (int i = 0; i < statements.size(); i++) {
Statement s = (Statement) statements.get(i);
QueryTable qt = (QueryTable) s.getQueryTables().get(0);
ArrayList secondaryTableKeys = qt.getTableDesc().getSecondaryTableKeys();
if (secondaryTableKeys != null) {
for (int j = 0; j < secondaryTableKeys.size(); j++) {
ReferenceKeyDesc secondaryTableKey = (ReferenceKeyDesc) secondaryTableKeys.get(j);
s.addSecondaryTableStatement(getStatement(findQueryTable(secondaryTableKey.getTableDesc())));
}
}
}
}
public int getAction() {
return action;
}
public ClassDesc getConfig() {
return config;
}
}
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