/*******************************************************************************
* Copyright (c) 2006, 2013 Oracle and/or its affiliates. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
* which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
* Oracle - initial API and implementation
*
******************************************************************************/
package org.eclipse.persistence.jpa.jpql.tools.spi.java;
import java.util.HashMap;
import java.util.Map;
import org.eclipse.persistence.jpa.jpql.tools.TypeHelper;
import org.eclipse.persistence.jpa.jpql.tools.spi.IType;
import org.eclipse.persistence.jpa.jpql.tools.spi.ITypeRepository;
/**
* The concrete implementation of {@link ITypeRepository} that is wrapping the Java class loader.
*
* @version 2.4
* @since 2.3
* @author Pascal Filion
*/
@SuppressWarnings("nls")
public class JavaTypeRepository implements ITypeRepository {
/**
* The repository used to access the application's classes.
*/
private final ClassLoader classLoader;
/**
* The helper that gives access to the most common {@link IType types}.
*/
private TypeHelper typeHelper;
/**
* The types that have been cached for faster access.
*/
private final Map<String, JavaType> types;
/**
* The {@link IType} that represents a unresolvable or simply an unknown type, which is created
* when {@link #getType(String)} is invoked with {@link IType#UNRESOLVABLE_TYPE}.
*/
private JavaType unresolvableType;
/**
* Creates a new <code>JavaTypeRepository</code>.
*
* @param classLoader The repository used to access the application's classes
*/
public JavaTypeRepository(ClassLoader classLoader) {
super();
this.classLoader = classLoader;
this.types = new HashMap<String, JavaType>();
}
/**
* Retrieves the Java type for the given type name, which has to be the fully qualified type name.
*
* @param typeName The fully qualified type name
* @return The Java type if it could be retrieved; <code>null</code> otherwise
*/
protected Class<?> attemptLoadType(String typeName) {
if (typeName.equals("boolean")) return Boolean .TYPE;
if (typeName.equals("byte")) return Byte .TYPE;
if (typeName.equals("char")) return Character.TYPE;
if (typeName.equals("double")) return Double .TYPE;
if (typeName.equals("float")) return Float .TYPE;
if (typeName.equals("int")) return Integer .TYPE;
if (typeName.equals("long")) return Long .TYPE;
if (typeName.equals("short")) return Short .TYPE;
try {
return classLoader.loadClass(typeName);
}
catch (ClassNotFoundException e) {
return null;
}
}
protected JavaType buildType(Class<?> javaType) {
JavaType type = new JavaType(this, javaType);
types.put(javaType.getName(), type);
return type;
}
protected JavaType buildType(String typeName) {
return new JavaType(this, typeName);
}
/**
* Returns the {@link ClassLoader} that is used to load Java classes.
*
* @return The {@link ClassLoader} that is used to load Java classes
*/
public ClassLoader getClassLoader() {
return classLoader;
}
/**
* {@inheritDoc}
*/
public IType getEnumType(String enumTypeName) {
// Get the position of the last dot so we can remove the constant
int lastDotIndex = enumTypeName.lastIndexOf(".");
if (lastDotIndex == -1) {
return null;
}
// Retrieve the fully qualified enum type name
String typeName = enumTypeName.substring(0, lastDotIndex);
// Attempt to load the enum type
IType type = loadTypeImp(typeName);
return type.isEnum() ? type : null;
}
/**
* {@inheritDoc}
*/
public JavaType getType(Class<?> javaClass) {
return getType(javaClass.getName());
}
/**
* {@inheritDoc}
*/
public JavaType getType(String typeName) {
if (typeName == IType.UNRESOLVABLE_TYPE) {
return unresolvableType();
}
if (typeName.charAt(0) == '[') {
return loadArrayType(typeName);
}
return loadTypeImp(typeName);
}
/**
* {@inheritDoc}
*/
public TypeHelper getTypeHelper() {
if (typeHelper == null) {
typeHelper = new TypeHelper(this);
}
return typeHelper;
}
protected JavaType loadArrayType(String typeName) {
JavaType type = types.get(typeName);
if (type == null) {
try {
type = new JavaType(this, Class.forName(typeName));
}
catch (ClassNotFoundException f) {
type = new JavaType(this, typeName);
}
types.put(typeName, type);
}
return type;
}
protected JavaType loadInnerType(String typeName) {
int index = typeName.lastIndexOf(".");
if (index == -1) {
return null;
}
StringBuilder sb = new StringBuilder();
sb.append(typeName.substring(0, index));
sb.append("$");
sb.append(typeName.substring(index + 1, typeName.length()));
typeName = sb.toString();
return loadTypeImp(typeName);
}
protected JavaType loadTypeImp(String typeName) {
JavaType type = types.get(typeName);
// The type was already cached, simply return it
if (type != null) {
return type;
}
// Attempt to load the Java type
Class<?> javaType = attemptLoadType(typeName);
// A Java type exists, return it
if (javaType != null) {
return buildType(javaType);
}
// Now try with a possible inner type
type = loadInnerType(typeName);
if (type == null) {
type = buildType(typeName);
}
return type;
}
protected JavaType unresolvableType() {
if (unresolvableType == null) {
unresolvableType = new JavaType(this, IType.UNRESOLVABLE_TYPE);
}
return unresolvableType;
}
}