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JDBC driver to allow clients to use JCR-SQL2 to query a ModeShape JCR repository within the same JVM process.
/*
* ModeShape (http://www.modeshape.org)
*
* 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 org.modeshape.jdbc;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import javax.jcr.PropertyType;
import javax.jcr.RepositoryException;
import javax.jcr.nodetype.NodeType;
import javax.jcr.nodetype.PropertyDefinition;
import javax.jcr.query.QueryResult;
import org.modeshape.jdbc.JcrType.DefaultDataTypes;
/**
* This driver's {@link ResultSetMetaData} implementation that obtains the metadata information from the JCR query result and
* (where possible) the column's corresponding property definitions.
*/
public class JcrResultSetMetaData implements ResultSetMetaData {
private final JcrConnection connection;
private final QueryResult results;
private int[] nullable;
protected JcrResultSetMetaData( JcrConnection connection,
QueryResult results ) {
this.connection = connection;
this.results = results;
}
/**
* {@inheritDoc}
*
* All columns come from the same repository (i.e., catalog).
*
*
* @see java.sql.ResultSetMetaData#getCatalogName(int)
*/
@Override
public String getCatalogName( int column ) {
return connection.info().getRepositoryName();
}
@Override
public String getColumnClassName( int column ) {
return getJcrType(column).getRepresentationClass().getName();
}
@Override
public int getColumnCount() throws SQLException {
try {
return results.getColumnNames().length;
} catch (RepositoryException e) {
throw new SQLException(e.getLocalizedMessage(), e);
}
}
/**
* {@inheritDoc}
*
* This method returns the nominal display size based upon the column's type. Therefore, the value may not reflect the optimal
* display size for any given value.
*
*
* @see java.sql.ResultSetMetaData#getColumnDisplaySize(int)
*/
@Override
public int getColumnDisplaySize( int column ) {
return getJcrType(column).getNominalDisplaySize();
}
@Override
public String getColumnLabel( int column ) throws SQLException {
try {
return results.getColumnNames()[column - 1]; // column value is 1-based
} catch (RepositoryException e) {
throw new SQLException(e.getLocalizedMessage(), e);
}
}
@Override
public String getColumnName( int column ) throws SQLException {
return getColumnLabel(column);
}
@Override
public int getColumnType( int column ) {
return getJcrType(column).getJdbcType();
}
@Override
public String getColumnTypeName( int column ) {
return getJcrType(column).getJdbcTypeName();
}
/**
* {@inheritDoc}
*
* This method always returns the nominal display size for the type.
*
*
* @see java.sql.ResultSetMetaData#getPrecision(int)
*/
@Override
public int getPrecision( int column ) {
return getJcrType(column).getNominalDisplaySize();
}
/**
* {@inheritDoc}
*
* This method returns the number of digits behind the decimal point, which is assumed to be 3 if the type is
* {@link PropertyType#DOUBLE} or 0 otherwise.
*
*
* @see java.sql.ResultSetMetaData#getScale(int)
*/
@Override
public int getScale( int column ) {
JcrType typeInfo = getJcrType(column);
if (typeInfo.getJcrType() == PropertyType.DOUBLE) {
return 3; // pulled from thin air
}
return 0;
}
/**
* {@inheritDoc}
*
* This method always returns the workspace name.
*
*
* @see java.sql.ResultSetMetaData#getSchemaName(int)
*/
@Override
public String getSchemaName( int column ) {
return connection.info().getWorkspaceName();
}
@Override
public String getTableName( int column ) throws SQLException {
try {
return results.getSelectorNames()[column - 1]; // column value is 1-based
} catch (RepositoryException e) {
throw new SQLException(e.getLocalizedMessage(), e);
}
}
/**
* {@inheritDoc}
*
* This method always returns false, since this JCR property types don't represent auto-incremented values.
*
*
* @see java.sql.ResultSetMetaData#isAutoIncrement(int)
*/
@Override
public boolean isAutoIncrement( int column ) {
return false;
}
@Override
public boolean isCaseSensitive( int column ) {
return getJcrType(column).isCaseSensitive();
}
/**
* {@inheritDoc}
*
* This method always returns false, since no JCR property types (directly) represent currency.
*
*
* @see java.sql.ResultSetMetaData#isCurrency(int)
*/
@Override
public boolean isCurrency( int column ) {
return false;
}
/**
* {@inheritDoc}
*
* This method always returns false, since this JDBC driver does not support writes.
*
*
* @see java.sql.ResultSetMetaData#isDefinitelyWritable(int)
*/
@Override
public boolean isDefinitelyWritable( int column ) {
return false;
}
@Override
public int isNullable( int column ) throws SQLException {
if (nullable == null) {
int length = getColumnCount();
nullable = new int[length];
for (int i = 0; i != length; ++i) {
nullable[i] = -1;
}
} else {
int result = nullable[column - 1];
if (result != -1) {
// Already found this value, so return it ...
return result;
}
}
// Find the node type for the column (given that the column name is the property name and
// the table name is the node type), and determine if the property definition is multi-valued or not mandatory.
String nodeTypeName = getTableName(column);
if (nodeTypeName.length() == 0) {
// There is no table for the column, so therefore we don't know the node type ...
return ResultSetMetaData.columnNullableUnknown;
}
String propertyName = getColumnName(column);
boolean singleProp = false;
boolean singleResidual = false;
boolean multiResidual = false;
NodeType type = connection.nodeType(nodeTypeName);
for (PropertyDefinition defn : type.getPropertyDefinitions()) {
if (defn.getName().equals(propertyName)) {
if (defn.isMultiple() || defn.isMandatory()) {
// We know this IS nullable
return ResultSetMetaData.columnNullable;
}
// Otherwise this is a single-valued property that is mandatory,
// but we can't return columnNotNullable because we may not have found the multi-valued property ...
singleProp = true;
} else if (defn.getName().equals("*")) { // Residual
if (defn.isMultiple() || defn.isMandatory()) multiResidual = true;
else singleResidual = true;
}
}
int result = ResultSetMetaData.columnNullableUnknown;
if (multiResidual) result = ResultSetMetaData.columnNullable;
else if (singleProp || singleResidual) result = ResultSetMetaData.columnNoNulls;
nullable[column - 1] = result;
return result;
}
/**
* {@inheritDoc}
*
* Even though the value may be writable in the JCR repository, this JDBC driver does not support writes. Therefore, this
* method always returns true.
*
*
* @see java.sql.ResultSetMetaData#isReadOnly(int)
*/
@Override
public boolean isReadOnly( int column ) {
return true;
}
/**
* {@inheritDoc}
*
* In JCR-SQL2, every property can be used in a WHERE clause. Therefore, this method always returns true.
*
*
* @see java.sql.ResultSetMetaData#isSearchable(int)
*/
@Override
public boolean isSearchable( int column ) {
return true;
}
/**
* {@inheritDoc}
*
* This method returns true if the column is a {@link PropertyType#DOUBLE}, {@link PropertyType#LONG} or
* {@link PropertyType#DATE}.
*
*
* @see java.sql.ResultSetMetaData#isSigned(int)
*/
@Override
public boolean isSigned( int column ) {
return getJcrType(column).isSigned();
}
/**
* {@inheritDoc}
*
* Even though the value may be writable in the JCR repository, this JDBC driver does not support writes. Therefore, this
* method always returns false.
*
*
* @see java.sql.ResultSetMetaData#isWritable(int)
*/
@Override
public boolean isWritable( int column ) {
return false;
}
@Override
public boolean isWrapperFor( Class iface ) /*throws SQLException*/{
return iface.isInstance(results);
}
@Override
public T unwrap( Class iface ) throws SQLException {
if (iface.isInstance(results)) {
return iface.cast(results);
}
throw new SQLException(JdbcLocalI18n.classDoesNotImplementInterface.text(ResultSetMetaData.class.getSimpleName(),
iface.getName()));
}
private JcrType getJcrType( int column ) {
JcrType typeInfo = null;
if (results instanceof org.modeshape.jcr.api.query.QueryResult) {
final String typeName = ((org.modeshape.jcr.api.query.QueryResult)results).getColumnTypes()[column - 1];
typeInfo = JcrType.typeInfo(typeName);
}
/**
* If no type is matched, then default to STRING
*/
return (typeInfo != null ? typeInfo : JcrType.typeInfo(DefaultDataTypes.STRING));
}
}