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Cayenne Object Persistence Framework
/*****************************************************************
* 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.io.Serializable;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import org.apache.commons.lang.builder.EqualsBuilder;
import org.apache.commons.lang.builder.HashCodeBuilder;
import org.apache.commons.lang.builder.ToStringBuilder;
import org.apache.cayenne.dba.TypesMapping;
import org.apache.cayenne.map.DbAttribute;
import org.apache.cayenne.map.ObjAttribute;
import org.apache.cayenne.map.ProcedureParameter;
/**
* A descriptor of a ResultSet column.
*
* @since 1.1
* @author Andrei Adamchik
*/
public class ColumnDescriptor implements Serializable {
protected String tableName;
protected String procedureName;
// identifies column in result set
protected String name;
protected String qualifiedColumnName;
// identifies column in a DataRow
protected String label;
/**
* @deprecated since 1.2
*/
protected boolean primaryKey;
protected int jdbcType;
protected String javaClass;
/**
* Creates a ColumnDescriptor
*/
public ColumnDescriptor() {
}
/**
* Creates a column descriptor with user-specified parameters.
*
* @since 1.2
*/
public ColumnDescriptor(String columnName, int jdbcType, String javaClass) {
this.name = columnName;
this.qualifiedColumnName = columnName;
this.label = columnName;
this.jdbcType = jdbcType;
this.javaClass = javaClass;
}
/**
* Creates a ColumnDescriptor from Cayenne ObjAttribute and DbAttribute.
*
* @deprecated since 1.2 use constructor with column alias parameter.
*/
public ColumnDescriptor(ObjAttribute objAttribute, DbAttribute dbAttribute) {
this(objAttribute, dbAttribute, null);
}
/**
* Creates a ColumnDescriptor from Cayenne DbAttribute.
*
* @since 1.2
*/
public ColumnDescriptor(DbAttribute attribute, String columnAlias) {
this.name = attribute.getName();
this.qualifiedColumnName = attribute.getAliasedName(columnAlias);
this.label = name;
this.jdbcType = attribute.getType();
this.primaryKey = attribute.isPrimaryKey();
this.javaClass = getDefaultJavaClass(attribute.getMaxLength(), attribute
.getPrecision());
if (attribute.getEntity() != null) {
this.tableName = attribute.getEntity().getName();
}
}
/**
* @since 1.2
*/
public ColumnDescriptor(ObjAttribute objAttribute, DbAttribute dbAttribute,
String columnAlias) {
this(dbAttribute, columnAlias);
this.label = objAttribute.getDbAttributePath();
this.javaClass = objAttribute.getType();
}
/**
* Creates a ColumnDescriptor from stored procedure parameter.
*
* @since 1.2
*/
public ColumnDescriptor(ProcedureParameter parameter) {
this.name = parameter.getName();
this.qualifiedColumnName = name;
this.label = name;
this.jdbcType = parameter.getType();
this.javaClass = getDefaultJavaClass(parameter.getMaxLength(), parameter
.getPrecision());
if (parameter.getProcedure() != null) {
this.procedureName = parameter.getProcedure().getName();
}
}
/**
* Creates a ColumnDescriptor using ResultSetMetaData.
*
* @since 1.2
*/
public ColumnDescriptor(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;
}
}
this.name = name;
this.qualifiedColumnName = name;
this.label = name;
this.jdbcType = metaData.getColumnType(position);
this.javaClass = getDefaultJavaClass(metaData.getColumnDisplaySize(position),
metaData.getScale(position));
}
/**
* 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
*/
public boolean equals(Object o) {
if (!(o instanceof ColumnDescriptor)) {
return false;
}
ColumnDescriptor rhs = (ColumnDescriptor) o;
return new EqualsBuilder()
.append(name, rhs.name)
.append(qualifiedColumnName, rhs.qualifiedColumnName)
.append(procedureName, rhs.procedureName)
.append(label, rhs.label)
.append(tableName, rhs.tableName)
.isEquals();
}
/**
* @since 1.2
*/
public int hashCode() {
return new HashCodeBuilder(23, 43)
.append(name)
.append(qualifiedColumnName)
.append(procedureName)
.append(tableName)
.append(label)
.toHashCode();
}
/**
* @since 1.2
*/
public String toString() {
ToStringBuilder builder = new ToStringBuilder(this);
builder.append("namePrefix", getQualifiedColumnName());
builder.append("name", getName());
builder.append("label", getLabel());
builder.append("tableName", getTableName());
builder.append("procedureName", getProcedureName());
builder.append("javaClass", getJavaClass());
builder.append("jdbcType", getJdbcType());
return builder.toString();
}
/**
* Returns a default Java class for an internal JDBC type.
*
* @since 1.2
*/
public String getDefaultJavaClass(int size, int scale) {
return TypesMapping.getJavaBySqlType(getJdbcType(), size, scale);
}
/**
* Returns "qualifiedColumnName" property.
*
* @since 1.2
*/
public String getQualifiedColumnName() {
return qualifiedColumnName != null ? qualifiedColumnName : name;
}
public int getJdbcType() {
return jdbcType;
}
/**
* Retunrs column name. Name is an unqualified column name in a query.
*/
public String getName() {
return name;
}
public void setJdbcType(int i) {
jdbcType = i;
}
public void setName(String name) {
this.name = name;
}
/**
* @deprecated since 1.2
*/
public boolean isPrimaryKey() {
return primaryKey;
}
public String getJavaClass() {
return javaClass;
}
/**
* @deprecated since 1.2
*/
public void setPrimaryKey(boolean b) {
primaryKey = b;
}
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 1.2
*/
public void setQualifiedColumnName(String namePrefix) {
this.qualifiedColumnName = namePrefix;
}
/**
* Returns "label" used in a DataRow for column value.
*
* @since 1.2
*/
public String getLabel() {
return (label != null) ? label : getName();
}
/**
* @since 1.2
*/
public void setLabel(String columnName) {
this.label = columnName;
}
}
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