modules/core/src/main/java/org/apache/ignite/internal/jdbc2/JdbcResultSetMetadata.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.ignite.internal.jdbc2;

import java.sql.*;
import java.util.*;

/**
 * JDBC result set metadata implementation.
 */
public class JdbcResultSetMetadata implements ResultSetMetaData {
    /** Column width. */
    private static final int COL_WIDTH = 30;

    /** Table names. */
    private final List<String> tbls;

    /** Column names. */
    private final List<String> cols;

    /** Class names. */
    private final List<String> types;

    /**
     * @param tbls Table names.
     * @param cols Column names.
     * @param types Types.
     */
    JdbcResultSetMetadata(List<String> tbls, List<String> cols, List<String> types) {
        assert cols != null;
        assert types != null;

        this.tbls = tbls;
        this.cols = cols;
        this.types = types;
    }

    /** {@inheritDoc} */
    @Override public int getColumnCount() throws SQLException {
        return cols.size();
    }

    /** {@inheritDoc} */
    @Override public boolean isAutoIncrement(int col) throws SQLException {
        return false;
    }

    /** {@inheritDoc} */
    @Override public boolean isCaseSensitive(int col) throws SQLException {
        return false;
    }

    /** {@inheritDoc} */
    @Override public boolean isSearchable(int col) throws SQLException {
        return false;
    }

    /** {@inheritDoc} */
    @Override public boolean isCurrency(int col) throws SQLException {
        return false;
    }

    /** {@inheritDoc} */
    @Override public int isNullable(int col) throws SQLException {
        return columnNullable;
    }

    /** {@inheritDoc} */
    @Override public boolean isSigned(int col) throws SQLException {
        return true;
    }

    /** {@inheritDoc} */
    @Override public int getColumnDisplaySize(int col) throws SQLException {
        return COL_WIDTH;
    }

    /** {@inheritDoc} */
    @Override public String getColumnLabel(int col) throws SQLException {
        return cols.get(col - 1);
    }

    /** {@inheritDoc} */
    @Override public String getColumnName(int col) throws SQLException {
        return cols.get(col - 1);
    }

    /** {@inheritDoc} */
    @Override public String getSchemaName(int col) throws SQLException {
        return "";
    }

    /** {@inheritDoc} */
    @Override public int getPrecision(int col) throws SQLException {
        return 0;
    }

    /** {@inheritDoc} */
    @Override public int getScale(int col) throws SQLException {
        return 0;
    }

    /** {@inheritDoc} */
    @Override public String getTableName(int col) throws SQLException {
        return tbls != null ? tbls.get(col - 1) : "";
    }

    /** {@inheritDoc} */
    @Override public String getCatalogName(int col) throws SQLException {
        return "";
    }

    /** {@inheritDoc} */
    @Override public int getColumnType(int col) throws SQLException {
        return JdbcUtils.type(types.get(col - 1));
    }

    /** {@inheritDoc} */
    @Override public String getColumnTypeName(int col) throws SQLException {
        return JdbcUtils.typeName(types.get(col - 1));
    }

    /** {@inheritDoc} */
    @Override public boolean isReadOnly(int col) throws SQLException {
        return true;
    }

    /** {@inheritDoc} */
    @Override public boolean isWritable(int col) throws SQLException {
        return false;
    }

    /** {@inheritDoc} */
    @Override public boolean isDefinitelyWritable(int col) throws SQLException {
        return false;
    }

    /** {@inheritDoc} */
    @Override public String getColumnClassName(int col) throws SQLException {
        return types.get(col - 1);
    }

    /** {@inheritDoc} */
    @SuppressWarnings("unchecked")
    @Override public <T> T unwrap(Class<T> iface) throws SQLException {
        if (!isWrapperFor(iface))
            throw new SQLException("Result set meta data is not a wrapper for " + iface.getName());

        return (T)this;
    }

    /** {@inheritDoc} */
    @Override public boolean isWrapperFor(Class<?> iface) throws SQLException {
        return iface == ResultSetMetaData.class;
    }
}