package com.avaje.ebeaninternal.server.persist.dml;
import java.sql.SQLException;
import com.avaje.ebean.annotation.ConcurrencyMode;
import com.avaje.ebean.bean.EntityBean;
import com.avaje.ebeaninternal.server.core.PersistRequestBean;
import com.avaje.ebeaninternal.server.deploy.BeanDescriptor;
import com.avaje.ebeaninternal.server.persist.dmlbind.Bindable;
import com.avaje.ebeaninternal.server.persist.dmlbind.BindableId;
/**
* Meta data for delete handler. The meta data is for a particular bean type. It
* is considered immutable and is thread safe.
*/
public final class DeleteMeta {
private final String sqlVersion;
private final String sqlNone;
private final BindableId id;
private final Bindable version;
private final String tableName;
private final boolean emptyStringAsNull;
public DeleteMeta(boolean emptyStringAsNull, BeanDescriptor<?> desc, BindableId id, Bindable version) {
this.emptyStringAsNull = emptyStringAsNull;
this.tableName = desc.getBaseTable();
this.id = id;
this.version = version;
this.sqlNone = genSql(ConcurrencyMode.NONE);
this.sqlVersion = genSql(ConcurrencyMode.VERSION);
}
public boolean isEmptyStringAsNull() {
return emptyStringAsNull;
}
/**
* Return the table name.
*/
public String getTableName() {
return tableName;
}
/**
* Bind the request based on the concurrency mode.
*/
public void bind(PersistRequestBean<?> persist, DmlHandler bind) throws SQLException {
EntityBean bean = persist.getEntityBean();
id.dmlBind(bind, bean);
switch (persist.getConcurrencyMode()) {
case VERSION:
version.dmlBind(bind, bean);
break;
default:
break;
}
}
/**
* get or generate the sql based on the concurrency mode.
*/
public String getSql(PersistRequestBean<?> request) throws SQLException {
if (id.isEmpty()) {
throw new IllegalStateException("Can not deleteById on " + request.getFullName() + " as no @Id property");
}
switch (request.determineConcurrencyMode()) {
case NONE:
return sqlNone;
case VERSION:
return sqlVersion;
default:
throw new RuntimeException("Invalid mode " + request.determineConcurrencyMode());
}
}
private String genSql(ConcurrencyMode conMode) {
// delete ... where bcol=? and bc1=? and bc2 is null and ...
GenerateDmlRequest request = new GenerateDmlRequest(emptyStringAsNull);
request.append("delete from ").append(tableName);
request.append(" where ");
request.setWhereIdMode();
id.dmlAppend(request);
if (ConcurrencyMode.VERSION.equals(conMode)) {
if (version == null) {
return null;
}
version.dmlAppend(request);
}
return request.toString();
}
}