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CPO is a persistence layer that allows you to persist POJOs. cpo-core is the persistence agnostic classes that are used for all persistence types.
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/*
 * Copyright (C) 2003-2012 David E. Berry
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * A copy of the GNU Lesser General Public License may also be found at
 * http://www.gnu.org/licenses/lgpl.txt
 */
package org.synchronoss.cpo;

import org.synchronoss.cpo.meta.domain.CpoAttribute;
import org.synchronoss.cpo.meta.domain.CpoClass;

import java.util.*;

/**
 * BindableWhereBuilder is an interface for specifying the sort order in which objects are returned from the Datasource.
 *
 * @author david berry
 */
public class BindableWhereBuilder implements NodeVisitor {

  private StringBuilder whereClause = new StringBuilder();
  private CpoClass cpoClass = null;
  private Collection bindValues = new ArrayList<>();

  public String getWhereClause() {
    return whereClause.toString();
  }

  public Collection getBindValues() {
    return this.bindValues;
  }

  @SuppressWarnings("unused")
  private BindableWhereBuilder() {
  }

  public BindableWhereBuilder(CpoClass cpoClass) {
    this.cpoClass = cpoClass;
  }

  /**
   * This is called by composite nodes prior to visiting children
   *
   * @param node The node to be visited
   * @return a boolean (false) to end visit or (true) to continue visiting
   */
  @Override
  public boolean visitBegin(Node node) throws Exception {
    BindableCpoWhere jcw = (BindableCpoWhere) node;
    whereClause.append(jcw.toString(cpoClass));
    if (jcw.hasParent() || jcw.getLogical() != CpoWhere.LOGIC_NONE) {
      whereClause.append(" (");
    } else {
      whereClause.append(" ");
    }

    return true;
  }

  /**
   * This is called for composite nodes between visiting children
   *
   * @param node The node to be visited
   * @return a boolean (false) to end visit or (true) to continue visiting
   */
  @Override
  public boolean visitMiddle(Node node) throws Exception {
    return true;
  }

  /**
   * This is called by composite nodes after visiting children
   *
   * @param node The node to be visited
   * @return a boolean (false) to end visit or (true) to continue visiting
   */
  @Override
  public boolean visitEnd(Node node) throws Exception {
    BindableCpoWhere bcw = (BindableCpoWhere) node;
    if (bcw.hasParent() || bcw.getLogical() != CpoWhere.LOGIC_NONE) {
      whereClause.append(")");
    }
    return true;
  }

  /**
   * This is called for component elements which have no children
   *
   * @param node The element to be visited
   * @return a boolean (false) to end visit or (true) to continue visiting
   */
  @Override
  public boolean visit(Node node) throws Exception {
    BindableCpoWhere bcw = (BindableCpoWhere) node;
    CpoAttribute attribute;
    whereClause.append(bcw.toString(cpoClass));
    if (bcw.getValue() != null) {
      attribute = cpoClass.getAttributeJava(bcw.getAttribute());
      if (attribute == null) {
        attribute = cpoClass.getAttributeJava(bcw.getRightAttribute());
      }
      if (attribute == null) {
        if (bcw.getComparison() == CpoWhere.COMP_IN && bcw.getValue() instanceof Collection) {
          for (Object obj : (Collection) bcw.getValue()) {
            bindValues.add(new BindAttribute(bcw.getAttribute() == null ? bcw.getRightAttribute() : bcw.getAttribute(), obj));
          }
        } else {
          bindValues.add(new BindAttribute(bcw.getAttribute() == null ? bcw.getRightAttribute() : bcw.getAttribute(), bcw.getValue()));
        }
      } else {
        if (bcw.getComparison() == CpoWhere.COMP_IN && bcw.getValue() instanceof Collection) {
          for (Object obj : (Collection) bcw.getValue()) {
            bindValues.add(new BindAttribute(attribute, obj));
          }
        } else {
          bindValues.add(new BindAttribute(attribute, bcw.getValue()));
        }
      }
    }
    return true;
  }
}