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/*******************************************************************************
* Copyright (c) 2005, 2010 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0, which accompanies this distribution
* and is available at http://www.eclipse.org/legal/epl-v10.html.
*
* Contributors:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.common.utility.internal;
import java.io.Serializable;
import java.lang.reflect.Field;
import java.sql.Types;
/**
* Associate the Java constant and the JDBC type name.
* These are derived from java.sql.Types.
*
* @see java.sql.Types
*/
public final class JDBCType
implements Cloneable, Serializable
{
/**
* the constant name (e.g. VARCHAR)
*/
private final String name;
/**
* the JDBC code used by JDBC drivers
*/
private final int code;
private static final long serialVersionUID = 1L;
// ********** constructors **********
/**
* Construct a JDBC type with the specified name and type code.
* This is private because all the possible JDBC types are built and
* stored in the static array TYPES.
* @see #types()
*/
private JDBCType(String name, int code) {
super();
this.name = name;
this.code = code;
}
// ********** accessors **********
/**
* Return the name of the type, as defined in java.sql.Types.
*/
public String name() {
return this.name;
}
/**
* Return the type code, as defined in java.sql.Types.
*/
public int code() {
return this.code;
}
// ********** printing and displaying **********
public void appendTo(StringBuilder sb) {
sb.append(this.name);
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append(this.getClass().getSimpleName());
sb.append('(');
this.appendTo(sb);
sb.append(')');
return sb.toString();
}
@Override
public JDBCType clone() {
try {
return (JDBCType) super.clone();
} catch (CloneNotSupportedException ex) {
throw new InternalError();
}
}
// ********** static stuff **********
/**
* all the JDBC type defined in java.sql.Types
*/
private static JDBCType[] TYPES; // pseudo 'final' - lazy-initialized
public synchronized static JDBCType[] types() {
if (TYPES == null) {
TYPES = buildTypes();
}
return TYPES;
}
/**
* Return the JDBC type for the specified type code (e.g. Types.VARCHAR).
* @see java.sql.Types
*/
public static JDBCType type(int code) {
JDBCType[] types = types();
for (int i = types.length; i-- > 0; ) {
if (types[i].code() == code) {
return types[i];
}
}
throw new IllegalArgumentException("invalid JDBC type code: " + code); //$NON-NLS-1$
}
/**
* Return the JDBC type for the specified type name (e.g. "VARCHAR").
* @see java.sql.Types
*/
public static JDBCType type(String name) {
JDBCType[] types = types();
for (int i = types.length; i-- > 0; ) {
if (types[i].name().equals(name)) {
return types[i];
}
}
throw new IllegalArgumentException("invalid JDBC type name: " + name); //$NON-NLS-1$
}
/**
* build up the JDBC types via reflection
* @see java.sql.Types
*/
private static JDBCType[] buildTypes() {
Field[] fields = Types.class.getDeclaredFields();
int len = fields.length;
JDBCType[] types = new JDBCType[len];
for (int i = len; i-- > 0; ) {
String name = fields[i].getName();
int code;
try {
code = ((Integer) fields[i].get(null)).intValue();
} catch (IllegalAccessException ex) {
throw new RuntimeException(ex); // shouldn't happen...
}
types[i] = new JDBCType(name, code);
}
return types;
}
}
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