AbstractJdbc3ParameterMetaData.java

/*****************************************************************************
 * Copyright (C) 2008 EnterpriseDB Corporation.
 * Copyright (C) 2011 Stado Global Development Group.
 *
 * This file is part of Stado.
 *
 * Stado is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Stado is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Stado.  If not, see <http://www.gnu.org/licenses/>.
 *
 * You can find Stado at http://www.stado.us
 *
 ****************************************************************************/
package org.postgresql.driver.jdbc3;

import java.sql.SQLException;
import java.sql.ParameterMetaData;

import org.postgresql.driver.core.BaseConnection;
import org.postgresql.driver.jdbc2.TypeInfoCache;
import org.postgresql.driver.util.GT;
import org.postgresql.driver.util.PSQLException;
import org.postgresql.driver.util.PSQLState;

public abstract class AbstractJdbc3ParameterMetaData {

    private final BaseConnection _connection;
    private final int _oids[];

    public AbstractJdbc3ParameterMetaData(BaseConnection connection, int oids[]) {
        _connection = connection;
        _oids = oids;
    }

    public String getParameterClassName(int param) throws SQLException {
        checkParamIndex(param);
        return _connection.getTypeInfo().getJavaClass(_oids[param-1]);
    }

    public int getParameterCount() {
        return _oids.length;
    }

    // For now report all parameters as inputs.  CallableStatements may
    // have one output, but ignore that for now.
    public int getParameterMode(int param) throws SQLException {
        checkParamIndex(param);
        return ParameterMetaData.parameterModeIn;
    }

    public int getParameterType(int param) throws SQLException {
        checkParamIndex(param);
        return _connection.getTypeInfo().getSQLType(_oids[param-1]);
    }

    public String getParameterTypeName(int param) throws SQLException {
        checkParamIndex(param);
        return _connection.getTypeInfo().getPGType(_oids[param-1]);
    }

    // we don't know this
    public int getPrecision(int param) throws SQLException {
        checkParamIndex(param);
        return 0;
    }

    // we don't know this
    public int getScale(int param) throws SQLException {
        checkParamIndex(param);
        return 0;
    }

    // we can't tell anything about nullability
    public int isNullable(int param) throws SQLException {
        checkParamIndex(param);
        return ParameterMetaData.parameterNullableUnknown;
    }

    // pg doesn't have unsigned numbers
    public boolean isSigned(int param) throws SQLException {
        checkParamIndex(param);
        return _connection.getTypeInfo().isSigned(_oids[param-1]);
    }

    private void checkParamIndex(int param) throws PSQLException {
        if (param < 1 || param > _oids.length)
            throw new PSQLException(GT.tr("The parameter index is out of range: {0}, number of parameters: {1}.", new Object[]{new Integer(param), new Integer(_oids.length)}), PSQLState.INVALID_PARAMETER_VALUE);
    }

}