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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
****************************************************************/
package org.apache.cayenne.access.jdbc;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import org.apache.cayenne.dba.TypesMapping;
import org.apache.cayenne.map.DbAttribute;
import org.apache.cayenne.map.ObjAttribute;
import org.apache.cayenne.map.ProcedureParameter;
import org.apache.cayenne.util.EqualsBuilder;
import org.apache.cayenne.util.HashCodeBuilder;
import org.apache.cayenne.util.ToStringBuilder;
/**
* A descriptor of a ResultSet column.
*
* @since 1.1
*/
public class ColumnDescriptor {
protected DbAttribute attribute;
protected String tableName;
protected String procedureName;
// identifies column in result set
protected String name;
protected String namePrefix;
// identifies column in a DataRow
protected String dataRowKey;
protected int jdbcType;
protected String javaClass;
/**
* @since 4.0
*/
protected boolean isExpression;
/**
* Creates a ColumnDescriptor
*/
public ColumnDescriptor() {
}
/**
* Creates a column descriptor with user-specified parameters.
*
* @since 3.1
*/
public ColumnDescriptor(String columnName, int jdbcType) {
this.name = columnName;
this.dataRowKey = columnName;
this.jdbcType = jdbcType;
this.javaClass = TypesMapping.getJavaBySqlType(jdbcType);
}
/**
* Creates a ColumnDescriptor from Cayenne DbAttribute.
*
* @since 1.2
*/
public ColumnDescriptor(DbAttribute attribute, String tableAlias) {
this(attribute.getName(), attribute.getType());
this.attribute = attribute;
this.namePrefix = tableAlias;
if (attribute.getEntity() != null) {
this.tableName = attribute.getEntity().getName();
}
}
/**
* @since 1.2
*/
public ColumnDescriptor(ObjAttribute objAttribute, DbAttribute dbAttribute, String columnAlias) {
this(dbAttribute, columnAlias);
this.dataRowKey = objAttribute.getDbAttributePath();
this.javaClass = objAttribute.getType();
}
/**
* Creates a ColumnDescriptor from stored procedure parameter.
*
* @since 1.2
*/
public ColumnDescriptor(ProcedureParameter parameter) {
this(parameter.getName(), parameter.getType());
if (parameter.getProcedure() != null) {
this.procedureName = parameter.getProcedure().getName();
}
}
/**
* Creates a ColumnDescriptor using ResultSetMetaData.
*
* @since 3.1
*/
public ColumnDescriptor(String columnName, ResultSetMetaData metaData, int position) throws SQLException {
this(columnName, metaData.getColumnType(position));
}
/**
* Creates a ColumnDescriptor using ResultSetMetaData.
*
* @since 1.2
*/
public ColumnDescriptor(ResultSetMetaData metaData, int position) throws SQLException {
this(getColumnNameFromMeta(metaData, position), metaData, position);
}
private static String getColumnNameFromMeta(ResultSetMetaData metaData, int position) throws SQLException {
String name = metaData.getColumnLabel(position);
if (name == null || name.length() == 0) {
name = metaData.getColumnName(position);
if (name == null || name.length() == 0) {
name = "column_" + position;
}
}
return name;
}
/**
* Returns a DbAttribute for this column. Since columns descriptors can be
* initialized in a context where a DbAttribite is unknown, this method may
* return null.
*
* @since 4.0
*/
public DbAttribute getAttribute() {
return attribute;
}
/**
* Returns true if another object is a ColumnDescriptor with the same name,
* name prefix, table and procedure names. Other fields are ignored in the
* equality test.
*
* @since 1.2
*/
@Override
public boolean equals(Object o) {
if (!(o instanceof ColumnDescriptor)) {
return false;
}
ColumnDescriptor rhs = (ColumnDescriptor) o;
return new EqualsBuilder().append(name, rhs.name).append(namePrefix, rhs.namePrefix)
.append(procedureName, rhs.procedureName).append(dataRowKey, rhs.dataRowKey)
.append(tableName, rhs.tableName).isEquals();
}
/**
* @since 1.2
*/
@Override
public int hashCode() {
return new HashCodeBuilder(23, 43).append(name).append(namePrefix).append(procedureName).append(tableName)
.append(dataRowKey).toHashCode();
}
/**
* @since 1.2
*/
@Override
public String toString() {
ToStringBuilder builder = new ToStringBuilder(this);
builder.append("namePrefix", namePrefix);
builder.append("name", getName());
builder.append("dataRowKey", getDataRowKey());
builder.append("tableName", getTableName());
builder.append("procedureName", getProcedureName());
builder.append("javaClass", getJavaClass());
builder.append("jdbcType", getJdbcType());
return builder.toString();
}
/**
* Returns "qualifiedColumnName" property.
*
* @since 1.2
*/
public String getQualifiedColumnName() {
return (namePrefix != null) ? namePrefix + '.' + name : name;
}
public int getJdbcType() {
return jdbcType;
}
/**
* Returns column name. Name is an unqualified column name in a query.
*/
public String getName() {
return name;
}
/**
* @since 4.0
*/
public String getNamePrefix() {
return namePrefix;
}
public void setJdbcType(int i) {
jdbcType = i;
}
public void setName(String name) {
this.name = name;
}
public String getJavaClass() {
return javaClass;
}
public void setJavaClass(String string) {
javaClass = string;
}
/**
* Returns the name of the parent table.
*
* @since 1.2
*/
public String getTableName() {
return tableName;
}
/**
* @since 1.2
*/
public void setTableName(String tableName) {
this.tableName = tableName;
}
/**
* Returns the name of the parent stored procedure.
*
* @since 1.2
*/
public String getProcedureName() {
return procedureName;
}
/**
* @since 1.2
*/
public void setProcedureName(String procedureName) {
this.procedureName = procedureName;
}
/**
* @since 3.0
*/
public String getDataRowKey() {
return dataRowKey != null ? dataRowKey : getName();
}
/**
* @since 3.0
*/
public void setDataRowKey(String dataRowKey) {
this.dataRowKey = dataRowKey;
}
/**
* @since 4.0
* @param isExpression is this column is an expression
*/
public void setIsExpression(boolean isExpression) {
this.isExpression = isExpression;
}
/**
* @since 4.0
* @return is this column is an expression
*/
public boolean isExpression() {
return isExpression;
}
}