/*
* Copyright 2013 Red Hat, Inc. and/or its affiliates.
*
* Licensed under the Eclipse Public License version 1.0, available at
* http://www.eclipse.org/legal/epl-v10.html
*/
package org.jboss.forge.addon.javaee.rest.generator;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.ManyToMany;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.OneToOne;
import org.jboss.forge.addon.javaee.rest.generation.RestGenerationContext;
import org.jboss.forge.addon.parser.java.facets.JavaSourceFacet;
import org.jboss.forge.addon.projects.Project;
import org.jboss.forge.roaster.model.Annotation;
import org.jboss.forge.roaster.model.Field;
import org.jboss.forge.roaster.model.JavaClass;
import org.jboss.forge.roaster.model.Member;
import org.jboss.forge.roaster.model.Method;
import org.jboss.forge.roaster.model.util.Strings;
/**
* A utlity class that provides information about the project or the JPA entity. This is to be used in the JAX-RS
* Resource generators.
*
*/
public class ResourceGeneratorUtil
{
public static String getResourcePath(RestGenerationContext context)
{
String packageName = context.getTargetPackageName();
String entityTable = getEntityTable(context.getEntity());
Project project = context.getProject();
String proposedQualifiedClassName = packageName + "." + entityTable + "Endpoint";
String proposedResourcePath = "/" + context.getInflector().pluralize(entityTable.toLowerCase());
RestResourceTypeVisitor resourceTypeVisitor = new RestResourceTypeVisitor();
resourceTypeVisitor.setFound(false);
resourceTypeVisitor.setProposedPath(proposedResourcePath);
JavaSourceFacet facet = project.getFacet(JavaSourceFacet.class);
while (true)
{
facet.visitJavaSources(resourceTypeVisitor);
if (resourceTypeVisitor.isFound())
{
if (proposedQualifiedClassName.equals(resourceTypeVisitor.getQualifiedClassNameForMatch()))
{
// The class might be overwritten later, so break out
break;
}
proposedResourcePath = proposedResourcePath.startsWith("/") ? "forge" + proposedResourcePath : "forge/"
+ proposedResourcePath;
resourceTypeVisitor.setProposedPath(proposedResourcePath);
resourceTypeVisitor.setFound(false);
}
else
{
break;
}
}
return proposedResourcePath;
}
public static String resolveIdType(JavaClass<?> entity)
{
for (Member<?> member : entity.getMembers())
{
if (member.hasAnnotation(Id.class))
{
if (member instanceof Method)
{
return ((Method<?, ?>) member).getReturnType().getName();
}
if (member instanceof Field)
{
return ((Field<?>) member).getType().getName();
}
}
}
return "Object";
}
public static String resolveIdGetterName(JavaClass<?> entity)
{
String result = null;
for (Member<?> member : entity.getMembers())
{
if (member.hasAnnotation(Id.class))
{
String name = member.getName();
String type = null;
if (member instanceof Method)
{
type = ((Method<?, ?>) member).getReturnType().getQualifiedName();
if (name.startsWith("get"))
{
name = name.substring(3);
}
}
else if (member instanceof Field)
{
type = ((Field<?>) member).getType().getQualifiedName();
}
if (type != null)
{
for (Method<?, ?> method : entity.getMethods())
{
// It's a getter
if (method.getParameters().size() == 0 && (method.getReturnType() != null && type.equals(method.getReturnType().getQualifiedName())))
{
if (method.getName().toLowerCase().contains(name.toLowerCase()))
{
result = method.getName() + "()";
break;
}
}
}
}
if (result != null)
{
break;
}
else if (type != null && member.isPublic())
{
String memberName = member.getName();
// Cheat a little if the member is public
if (member instanceof Method && memberName.startsWith("get"))
{
memberName = memberName.substring(3);
memberName = Strings.uncapitalize(memberName);
}
result = memberName;
}
}
}
if (result == null)
{
throw new RuntimeException("Could not determine @Id field and getter method for @Entity ["
+ entity.getQualifiedName()
+ "]. Aborting.");
}
return result;
}
public static String getEntityTable(final JavaClass<?> entity)
{
String table = entity.getName();
if (entity.hasAnnotation(Entity.class))
{
Annotation<?> a = entity.getAnnotation(Entity.class);
if (!Strings.isNullOrEmpty(a.getStringValue("name")))
{
table = a.getStringValue("name");
}
else if (!Strings.isNullOrEmpty(a.getStringValue()))
{
table = a.getStringValue();
}
}
return table;
}
public static String getSelectExpression(JavaClass<?> entity, String entityTable)
{
char entityVariable = getJpqlEntityVariable(entityTable);
StringBuilder expressionBuilder = new StringBuilder();
expressionBuilder.append("SELECT DISTINCT ");
expressionBuilder.append(entityVariable);
expressionBuilder.append(" FROM ");
expressionBuilder.append(entityTable);
expressionBuilder.append(" ");
expressionBuilder.append(entityVariable);
for (Member<?> member : entity.getMembers())
{
if (member.hasAnnotation(OneToOne.class) || member.hasAnnotation(OneToMany.class)
|| member.hasAnnotation(ManyToMany.class) || member.hasAnnotation(ManyToOne.class))
{
String name = member.getName();
String associationField = null;
if (member instanceof Method)
{
if (name.startsWith("get"))
{
associationField = Strings.uncapitalize(name.substring(3));
}
}
else if (member instanceof Field)
{
associationField = name;
}
if (associationField == null)
{
throw new RuntimeException("Could not compute the association field for member:" + member.getName()
+ " in entity" + entity.getName());
}
else
{
expressionBuilder.append(" LEFT JOIN FETCH ");
expressionBuilder.append(entityVariable);
expressionBuilder.append('.');
expressionBuilder.append(associationField);
}
}
}
return expressionBuilder.toString();
}
public static String getIdClause(JavaClass<?> entity, String entityTable)
{
for (Member<?> member : entity.getMembers())
{
if (member.hasAnnotation(Id.class))
{
String memberName = member.getName();
String id = null;
if (member instanceof Method)
{
// Getters are expected to obey JavaBean conventions
id = Strings.uncapitalize(memberName.substring(3));
}
if (member instanceof Field)
{
id = memberName;
}
char entityVariable = getJpqlEntityVariable(entityTable);
return "WHERE " + entityVariable + "." + id + " = " + ":entityId";
}
}
return null;
}
public static String getOrderClause(JavaClass<?> entity, char entityVariable)
{
StringBuilder expressionBuilder = new StringBuilder();
// Add the ORDER BY clause
for (Member<?> member : entity.getMembers())
{
if (member.hasAnnotation(Id.class))
{
String memberName = member.getName();
String id = null;
if (member instanceof Method)
{
// Getters are expected to obey JavaBean conventions
id = Strings.uncapitalize(memberName.substring(3));
}
if (member instanceof Field)
{
id = memberName;
}
expressionBuilder.append("ORDER BY ");
expressionBuilder.append(entityVariable);
expressionBuilder.append('.');
expressionBuilder.append(id);
}
}
return expressionBuilder.toString();
}
public static char getJpqlEntityVariable(String entityTable)
{
return entityTable.toLowerCase().charAt(0);
}
}