org.apache.calcite.jdbc.SimpleCalciteSchema.java Source code

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Here is the source code for org.apache.calcite.jdbc.SimpleCalciteSchema.java

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/*
 * 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.calcite.jdbc;

import org.apache.calcite.schema.Function;
import org.apache.calcite.schema.Schema;
import org.apache.calcite.schema.Table;
import org.apache.calcite.schema.TableMacro;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSortedMap;
import com.google.common.collect.ImmutableSortedSet;

import java.util.Collection;

/**
 * A concrete implementation of {@link org.apache.calcite.jdbc.CalciteSchema}
 * that maintains minimal state.
 */
class SimpleCalciteSchema extends CalciteSchema {
    /** Creates a SimpleCalciteSchema.
     *
     * <p>Use {@link CalciteSchema#createRootSchema(boolean)}
     * or {@link #add(String, Schema)}. */
    SimpleCalciteSchema(CalciteSchema parent, Schema schema, String name) {
        super(parent, schema, name);
    }

    public void setCache(boolean cache) {
        throw new UnsupportedOperationException();
    }

    public CalciteSchema add(String name, Schema schema) {
        final CalciteSchema calciteSchema = new SimpleCalciteSchema(this, schema, name);
        subSchemaMap.put(name, calciteSchema);
        return calciteSchema;
    }

    protected CalciteSchema getImplicitSubSchema(String schemaName, boolean caseSensitive) {
        // Check implicit schemas.
        Schema s = schema.getSubSchema(schemaName);
        if (s != null) {
            return new SimpleCalciteSchema(this, s, schemaName);
        }
        return null;
    }

    protected TableEntry getImplicitTable(String tableName, boolean caseSensitive) {
        // Check implicit tables.
        Table table = schema.getTable(tableName);
        if (table != null) {
            return tableEntry(tableName, table);
        }
        return null;
    }

    protected void addImplicitSubSchemaToBuilder(ImmutableSortedMap.Builder<String, CalciteSchema> builder) {
        ImmutableSortedMap<String, CalciteSchema> explicitSubSchemas = builder.build();
        for (String schemaName : schema.getSubSchemaNames()) {
            if (explicitSubSchemas.containsKey(schemaName)) {
                // explicit subschema wins.
                continue;
            }
            Schema s = schema.getSubSchema(schemaName);
            if (s != null) {
                CalciteSchema calciteSchema = new SimpleCalciteSchema(this, s, schemaName);
                builder.put(schemaName, calciteSchema);
            }
        }
    }

    protected void addImplicitTableToBuilder(ImmutableSortedSet.Builder<String> builder) {
        builder.addAll(schema.getTableNames());
    }

    protected void addImplicitFunctionsToBuilder(ImmutableList.Builder<Function> builder, String name,
            boolean caseSensitive) {
        Collection<Function> functions = schema.getFunctions(name);
        if (functions != null) {
            builder.addAll(functions);
        }
    }

    protected void addImplicitFuncNamesToBuilder(ImmutableSortedSet.Builder<String> builder) {
        builder.addAll(schema.getFunctionNames());
    }

    protected void addImplicitTablesBasedOnNullaryFunctionsToBuilder(
            ImmutableSortedMap.Builder<String, Table> builder) {
        ImmutableSortedMap<String, Table> explicitTables = builder.build();

        for (String s : schema.getFunctionNames()) {
            // explicit table wins.
            if (explicitTables.containsKey(s)) {
                continue;
            }
            for (Function function : schema.getFunctions(s)) {
                if (function instanceof TableMacro && function.getParameters().isEmpty()) {
                    final Table table = ((TableMacro) function).apply(ImmutableList.of());
                    builder.put(s, table);
                }
            }
        }
    }

    protected TableEntry getImplicitTableBasedOnNullaryFunction(String tableName, boolean caseSensitive) {
        Collection<Function> functions = schema.getFunctions(tableName);
        if (functions != null) {
            for (Function function : functions) {
                if (function instanceof TableMacro && function.getParameters().isEmpty()) {
                    final Table table = ((TableMacro) function).apply(ImmutableList.of());
                    return tableEntry(tableName, table);
                }
            }
        }
        return null;
    }

    protected boolean isCacheEnabled() {
        return false;
    }

}

// End SimpleCalciteSchema.java