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'jdbacl' stands for 'Java DataBase ACcess Layer' and provides utilities for accessing JDBC databases from Java programs, retrieving meta information in an object model and querying database data. 'rapiddweller jdbacl' is forked from Databene jdbacl by Volker Bergmann.
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/*
 * (c) Copyright 2011 by Volker Bergmann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, is permitted under the terms of the
 * GNU General Public License (GPL).
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * WITHOUT A WARRANTY OF ANY KIND. ALL EXPRESS OR IMPLIED CONDITIONS,
 * REPRESENTATIONS AND WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE
 * HEREBY EXCLUDED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

package com.rapiddweller.jdbacl.model;

import com.rapiddweller.common.CollectionUtil;
import com.rapiddweller.common.StringUtil;
import com.rapiddweller.jdbacl.sql.ColumnExpression;
import com.rapiddweller.jdbacl.sql.SQLParserUtil;
import com.rapiddweller.jdbacl.sql.parser.ANTLRNoCaseStringStream;
import com.rapiddweller.common.Expression;
import com.rapiddweller.script.expression.WrapperExpression;

import java.util.HashSet;
import java.util.Set;

/**
 * Represents a database check constraint.


 * Created: 01.06.2011 12:40:30
 *
 * @author Volker Bergmann
 * @since 0.6.8
 */
public class DBCheckConstraint extends DBConstraint {

  private static final long serialVersionUID = 3766067048212751458L;

  private final String tableName;
  private final String conditionText;
  private final Expression condition;
  private final String[] columnNames;

  /**
   * Instantiates a new Db check constraint.
   *
   * @param name              the name
   * @param nameDeterministic the name deterministic
   * @param owner             the owner
   * @param conditionText     the condition text
   */
  public DBCheckConstraint(String name, boolean nameDeterministic, DBTable owner, String conditionText) {
    this(name, nameDeterministic, owner.getName(), conditionText);
    owner.addCheckConstraint(this);
  }

  /**
   * Instantiates a new Db check constraint.
   *
   * @param name              the name
   * @param nameDeterministic the name deterministic
   * @param tableName         the table name
   * @param conditionText     the condition text
   */
  public DBCheckConstraint(String name, boolean nameDeterministic, String tableName, String conditionText) {
    super(name, nameDeterministic, "check constraint", null);
    this.tableName = tableName;
    this.conditionText = conditionText;
    this.condition = SQLParserUtil.parseExpression(new ANTLRNoCaseStringStream(conditionText));
    this.columnNames = getColumnNames(condition);
  }

  /**
   * Gets table name.
   *
   * @return the table name
   */
  public String getTableName() {
    return tableName;
  }

  @Override
  public boolean isIdentical(DBObject other) {
    if (this == other) {
      return true;
    }
    if (other == null || !(other instanceof DBCheckConstraint)) {
      return false;
    }
    DBCheckConstraint that = (DBCheckConstraint) other;
    return this.name.equals(that.getName())
        && this.conditionText.equals(that.getConditionText());
  }

  /**
   * Is equivalent boolean.
   *
   * @param that the that
   * @return the boolean
   */
  public boolean isEquivalent(DBCheckConstraint that) {
    return this.tableName.equals(that.tableName)
        && StringUtil.normalizeSpace(this.conditionText).equals(StringUtil.normalizeSpace(that.getConditionText()));
  }

  /**
   * Gets condition text.
   *
   * @return the condition text
   */
  public String getConditionText() {
    return conditionText;
  }

  @Override
  public String[] getColumnNames() {
    return columnNames;
  }

  @Override
  public String toString() {
    return (name != null ? "CONSTRAINT " + name : "") + "CHECK " + conditionText;
  }

  private String[] getColumnNames(Expression condition) {
    return CollectionUtil.toArray(scanForColumns(condition, new HashSet<>()), String.class);
  }

  private Set scanForColumns(Expression expression, Set result) {
    if (expression instanceof ColumnExpression) {
      result.add(((ColumnExpression) expression).getColumnName());
    } else if (expression instanceof WrapperExpression) {
      for (Expression sourceExpression : ((WrapperExpression) expression).getSourceExpressions()) {
        scanForColumns(sourceExpression, result);
      }
    }
    return result;
  }

}