Android Open Source - DKO Join

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License

The source code is released under:
GNU Lesser General Public License
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Java Source Code

package org.kered.dko;
//w w w. j  a va2  s .c om
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import javax.sql.DataSource;
import org.kered.dko.Field.FK;

/**
 * This class represents a join across 2 tables. It contains 2 typed references
 * ('l' and 'r') to the join row components. (each of them containing all the
 * columns they contributed to the join)
 */
public class Join<L extends Table, R extends Table> extends Table {

  List<Class<?>> types = null;
  Collection<Field<?>> fields = null;

  public final L l;
  public final R r;

  public Join(final L l, final R r) {
    this.l = l;
    this.r = r;
  }

  Join(final Object[] oa) {
    this(oa, oa.length);
  }

  @SuppressWarnings("unchecked")
  Join(final Object[] oa, final int end) {
    if (end==2) l = (L) oa[0];
    else l = (L) new Join(oa, end-1);
    r = (R) oa[end-1];
  }

  @SuppressWarnings("unchecked")
  Join(final Object[] oa, final int offset, Collection<Field<?>> fields) {
    l = (L) oa[offset + 0];
    r = (R) oa[offset + 1];
    this.fields = fields;
  }

  @Override
  protected String SCHEMA_NAME() {
    return (l == null ? null : l.SCHEMA_NAME()) + " + " + (r == null ? null : r.SCHEMA_NAME());
  }

  @Override
  protected String TABLE_NAME() {
    return (l == null ? null : l.TABLE_NAME()) + " + " + (r == null ? null : r.TABLE_NAME());
  }

  @Override
  public List<Field<?>> fields() {
    List<Field<?>> fields = new ArrayList<Field<?>>();
    if (l != null)
      fields.addAll(l.fields());
    if (r != null)
      fields.addAll(r.fields());
    fields = Collections.unmodifiableList(fields);
    return fields;
  }

  private static final FK[] fks = {};
  @SuppressWarnings("rawtypes")
  @Override
  protected FK[] FKS() {
    return fks;
  }

  @Override
  public <S> S get(final Expression.Select<S> field) {
    if (l != null) {
      S o = l.get(field);
      if (o!=null) return o;
    }
    if (r != null) {
      S o = r.get(field);
      if (o!=null) return o;
    }
    if (fields!=null && fields.contains(field)) return null;
    //throw new IllegalArgumentException("unknown field " + field);
    return null;
  }

  @Override
  public <S> Table set(final Expression.Select<S> field, final S value) {
    try {
      l.set(field, value);
      return this;
    } catch (final IllegalArgumentException e) { /* ignore */ }
    try {
      r.set(field, value);
      return this;
    } catch (final IllegalArgumentException e) { /* ignore */ }
    if (fields != null && fields.contains(field))
      throw new RuntimeException("you can't set this field because the joined object is null (some join types can return nulls from the database): " + field);
    ;
    throw new IllegalArgumentException("unknown field " + field);
  }

  @Override
  public boolean insert() throws SQLException {
    return (l != null && l.insert()) && (r != null && r.insert());
  }

  @Override
  public boolean insert(DataSource ds) throws SQLException {
    return (l != null && l.insert(ds)) && (r != null && r.insert(ds));
  }

  @Override
  public boolean update() throws SQLException {
    return (l != null && l.update()) && (r != null && r.update());
  }

  @Override
  public boolean update(DataSource ds) throws SQLException {
    return (l != null && l.update(ds)) && (r != null && r.update(ds));
  }

  @Override
  public boolean delete() throws SQLException {
    return (l != null && l.delete()) && (r != null && r.delete());
  }

  @Override
  public boolean delete(DataSource ds) throws SQLException {
    return (l != null && l.delete(ds)) && (r != null && r.delete(ds));
  }

  @Override
  public boolean save() throws SQLException {
    return (l != null && l.save()) && (r != null && r.save());
  }

  @Override
  public boolean save(DataSource ds) throws SQLException {
    return (l != null && l.save(ds)) && (r != null && r.save(ds));
  }

  @Override
  public boolean exists() throws SQLException {
    return (l != null && l.exists()) || (r != null && r.exists());
  }

  @Override
  public boolean exists(DataSource ds) throws SQLException {
    return (l != null && l.exists(ds)) || (r != null && r.exists(ds));
  }

  @Override
  protected Object __NOSCO_PRIVATE_mapType(final Object o) {
    return l.__NOSCO_PRIVATE_mapType(o);
  }

  @Override
  public String toString() {
    return l + "+" + r;
  }

  @Override
  public String toStringDetailed() {
    return (l == null ? l : l.toStringDetailed()) + "+"
        + (r == null ? r : r.toStringDetailed());
  }

  @Override
  public int hashCode() {
    final int prime = 31;
    int result = super.hashCode();
    result = prime * result + ((fields == null) ? 0 : fields.hashCode());
    result = prime * result + ((l == null) ? 0 : l.hashCode());
    result = prime * result + ((r == null) ? 0 : r.hashCode());
    result = prime * result + ((types == null) ? 0 : types.hashCode());
    return result;
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj)
      return true;
    if (getClass() != obj.getClass())
      return false;
    Join other = (Join) obj;
    if (fields == null) {
      if (other.fields != null)
        return false;
    } else if (!fields.equals(other.fields))
      return false;
    if (l == null) {
      if (other.l != null)
        return false;
    } else if (!l.equals(other.l))
      return false;
    if (r == null) {
      if (other.r != null)
        return false;
    } else if (!r.equals(other.r))
      return false;
    if (types == null) {
      if (other.types != null)
        return false;
    } else if (!types.equals(other.types))
      return false;
    return true;
  }

}
Java Source Code List
