com.arcadedb.query.sql.parser.IfStatement Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of arcadedb-engine Show documentation
There is a newer version: 24.11.1
/*
 * Copyright © 2021-present Arcade Data Ltd ([email protected])
 *
 * 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.
 *
 * SPDX-FileCopyrightText: 2021-present Arcade Data Ltd ([email protected])
 * SPDX-License-Identifier: Apache-2.0
 */
/* Generated By:JJTree: Do not edit this line. IfStatement.java Version 4.3 */
/* JavaCCOptions:MULTI=true,NODE_USES_PARSER=false,VISITOR=true,TRACK_TOKENS=true,NODE_PREFIX=O,NODE_EXTENDS=,NODE_FACTORY=,SUPPORT_USERTYPE_VISIBILITY_PUBLIC=true */
package com.arcadedb.query.sql.parser;

import com.arcadedb.database.Database;
import com.arcadedb.query.sql.executor.BasicCommandContext;
import com.arcadedb.query.sql.executor.CommandContext;
import com.arcadedb.query.sql.executor.EmptyStep;
import com.arcadedb.query.sql.executor.ExecutionStepInternal;
import com.arcadedb.query.sql.executor.IfExecutionPlan;
import com.arcadedb.query.sql.executor.IfStep;
import com.arcadedb.query.sql.executor.ResultSet;
import com.arcadedb.query.sql.executor.SelectExecutionPlan;
import com.arcadedb.query.sql.executor.UpdateExecutionPlan;

import java.util.*;
import java.util.stream.*;

public class IfStatement extends Statement {
  protected BooleanExpression expression;
  protected List   statements     = new ArrayList();
  protected List   elseStatements = new ArrayList();//TODO support ELSE in the SQL syntax

  public IfStatement(final int id) {
    super(id);
  }

  @Override
  public boolean isIdempotent() {
    for (final Statement stm : statements) {
      if (!stm.isIdempotent()) {
        return false;
      }
    }
    for (final Statement stm : elseStatements) {
      if (!stm.isIdempotent()) {
        return false;
      }
    }
    return true;
  }

  @Override
  public ResultSet execute(final Database db, final Object[] args, final CommandContext parentcontext, final boolean usePlanCache) {
    final BasicCommandContext context = new BasicCommandContext();
    if (parentcontext != null) {
      context.setParentWithoutOverridingChild(parentcontext);
    }
    context.setDatabase(db);
    context.setInputParameters(args);
    final IfExecutionPlan executionPlan;
    if (usePlanCache) {
      executionPlan = createExecutionPlan(context, false);
    } else {
      executionPlan = (IfExecutionPlan) createExecutionPlanNoCache(context, false);
    }

    ExecutionStepInternal last = executionPlan.executeUntilReturn();
    if (last == null) {
      last = new EmptyStep(context, false);
    }
    if (isIdempotent()) {
      final SelectExecutionPlan finalPlan = new SelectExecutionPlan(context);
      finalPlan.chain(last);
      return new LocalResultSet(finalPlan);
    } else {
      final UpdateExecutionPlan finalPlan = new UpdateExecutionPlan(context);
      finalPlan.chain(last);
      finalPlan.executeInternal();
      return new LocalResultSet(finalPlan);
    }
  }

  @Override
  public ResultSet execute(final Database db, final Map params, final CommandContext parentcontext, final boolean usePlanCache) {
    final BasicCommandContext context = new BasicCommandContext();
    if (parentcontext != null) {
      context.setParentWithoutOverridingChild(parentcontext);
    }
    context.setDatabase(db);
    context.setInputParameters(params);

    final IfExecutionPlan executionPlan;
    if (usePlanCache) {
      executionPlan = createExecutionPlan(context, false);
    } else {
      executionPlan = (IfExecutionPlan) createExecutionPlanNoCache(context, false);
    }

    ExecutionStepInternal last = executionPlan.executeUntilReturn();
    if (last == null) {
      last = new EmptyStep(context, false);
    }
    if (isIdempotent()) {
      final SelectExecutionPlan finalPlan = new SelectExecutionPlan(context);
      finalPlan.chain(last);
      return new LocalResultSet(finalPlan);
    } else {
      final UpdateExecutionPlan finalPlan = new UpdateExecutionPlan(context);
      finalPlan.chain(last);
      finalPlan.executeInternal();
      return new LocalResultSet(finalPlan);
    }
  }

  @Override
  public IfExecutionPlan createExecutionPlan(final CommandContext context, final boolean enableProfiling) {
    final IfExecutionPlan plan = new IfExecutionPlan(context);

    final IfStep step = new IfStep(context, enableProfiling);
    step.setCondition(this.expression);
    plan.chain(step);

    step.positiveStatements = statements;
    step.negativeStatements = elseStatements;
    return plan;
  }

  @Override
  public void toString(final Map params, final StringBuilder builder) {
    builder.append("IF(");
    expression.toString(params, builder);
    builder.append("){\n");
    for (final Statement stm : statements) {
      stm.toString(params, builder);
      builder.append(";\n");
    }
    builder.append("}");
    if (elseStatements.size() > 0) {
      builder.append("\nELSE {\n");
      for (final Statement stm : elseStatements) {
        stm.toString(params, builder);
        builder.append(";\n");
      }
      builder.append("}");
    }
  }

  @Override
  public IfStatement copy() {
    final IfStatement result = new IfStatement(-1);
    result.expression = expression == null ? null : expression.copy();
    result.statements = statements == null ? null : statements.stream().map(Statement::copy).collect(Collectors.toList());
    result.elseStatements = elseStatements == null ? null : elseStatements.stream().map(Statement::copy).collect(Collectors.toList());
    return result;
  }

  @Override
  protected Object[] getIdentityElements() {
    return new Object[] { expression, statements, elseStatements };
  }

  public List getStatements() {
    return statements;
  }

  public boolean containsReturn() {
    for (final Statement stm : this.statements) {
      if (stm instanceof ReturnStatement) {
        return true;
      }
      if (stm instanceof ForEachBlock && ((ForEachBlock) stm).containsReturn()) {
        return true;
      }
      if (stm instanceof IfStatement && ((IfStatement) stm).containsReturn()) {
        return true;
      }
    }

    if (elseStatements != null) {
      for (final Statement stm : this.elseStatements) {
        if (stm instanceof ReturnStatement) {
          return true;
        }
        if (stm instanceof ForEachBlock && ((ForEachBlock) stm).containsReturn()) {
          return true;
        }
        if (stm instanceof IfStatement && ((IfStatement) stm).containsReturn()) {
          return true;
        }
      }
    }
    return false;
  }
}

/* JavaCC - OriginalChecksum=a8cd4fb832a4f3b6e71bb1a12f8d8819 (do not edit this line) */