com.querydsl.sql.namemapping.PreConfiguredNameMapping Maven / Gradle / Ivy

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SQL support for Querydsl
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/*
 * Copyright 2015, The Querydsl Team (http://www.querydsl.com/team)
 *
 * 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 com.querydsl.sql.namemapping;

import java.util.HashMap;
import java.util.Map;

import com.google.common.base.Optional;
import com.google.common.collect.Maps;
import com.querydsl.sql.SchemaAndTable;

/**
 * {@link NameMapping} implementation that allows specifying exact schema, table and column name mappings.
 */
public class PreConfiguredNameMapping implements NameMapping {

    private final Map schemaTables = Maps.newHashMap();

    private final Map tables = Maps.newHashMap();

    private final Map> schemaTableColumns = Maps.newHashMap();

    private final Map> tableColumns = Maps.newHashMap();

    public Optional getOverride(SchemaAndTable key) {
        if (!schemaTables.isEmpty() && key.getSchema() != null) {
            if (schemaTables.containsKey(key)) {
                return Optional.of(schemaTables.get(key));
            }
        }

        if (tables.containsKey(key.getTable())) {
            String table = tables.get(key.getTable());
            return Optional.of(new SchemaAndTable(key.getSchema(), table));
        }
        return Optional.absent();
    }

    public Optional getColumnOverride(SchemaAndTable key, String column) {
        Map columnOverrides;
        String newColumn = null;
        columnOverrides = schemaTableColumns.get(key);
        if (columnOverrides != null && (newColumn = columnOverrides.get(column)) != null) {
            return Optional.of(newColumn);
        }
        columnOverrides = tableColumns.get(key.getTable());
        if (columnOverrides != null && (newColumn = columnOverrides.get(column)) != null) {
            return Optional.of(newColumn);
        }
        return Optional.absent();
    }

    public String registerTableOverride(String oldTable, String newTable) {
        return tables.put(oldTable, newTable);
    }

    public SchemaAndTable registerTableOverride(SchemaAndTable from, SchemaAndTable to) {
        return schemaTables.put(from, to);
    }

    public String registerColumnOverride(String schema, String table, String oldColumn, String newColumn) {
        SchemaAndTable key = new SchemaAndTable(schema, table);
        Map columnOverrides = schemaTableColumns.get(key);
        if (columnOverrides == null) {
            columnOverrides = new HashMap();
            schemaTableColumns.put(key, columnOverrides);
        }
        return columnOverrides.put(oldColumn, newColumn);
    }

    public String registerColumnOverride(String table, String oldColumn, String newColumn) {
        Map columnOverrides = tableColumns.get(table);
        if (columnOverrides == null) {
            columnOverrides = new HashMap();
            tableColumns.put(table, columnOverrides);
        }
        return columnOverrides.put(oldColumn, newColumn);
    }

}