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/*******************************************************************************
* Copyright (c) 2005, 2008 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.core.internal.utility.jdt;
import org.eclipse.jdt.core.dom.IMethodBinding;
import org.eclipse.jdt.core.dom.ITypeBinding;
import org.eclipse.jdt.core.dom.IVariableBinding;
import org.eclipse.jdt.core.dom.Modifier;
public class JPTTools {
/**
* Return whether the specified field may be "persisted".
* According to the spec, "All non-transient instance variables that are not
* annotated with the Transient annotation are persistent."
*/
public static boolean fieldIsPersistable(IVariableBinding field) {
int modifiers = field.getModifiers();
if (Modifier.isStatic(modifiers)) {
return false;
}
if (Modifier.isTransient(modifiers)) {
return false;
}
return true;
}
/**
* Return whether the specified method is a "getter" method that
* represents a property that may be "persisted".
*/
public static boolean methodIsPersistablePropertyGetter(IMethodBinding methodBinding) {
if (methodHasBadModifiers(methodBinding)) {
return false;
}
ITypeBinding returnType = methodBinding.getReturnType();
if (returnType == null) {
return false;
}
String returnTypeName = returnType.getQualifiedName();
if (returnTypeName.equals("void")) { //$NON-NLS-1$
return false;
}
if (methodBinding.getParameterTypes().length != 0) {
return false;
}
String methodName = methodBinding.getName();
int beginIndex = 0;
boolean booleanGetter = false;
if (methodName.startsWith("is")) { //$NON-NLS-1$
if (returnTypeName.equals("boolean")) { //$NON-NLS-1$
beginIndex = 2;
} else {
return false;
}
} else {
if (methodName.startsWith("get")) { //$NON-NLS-1$
beginIndex = 3;
if (returnTypeName.equals("boolean")) { //$NON-NLS-1$
booleanGetter = true;
}
} else {
return false;
}
}
String capitalizedAttributeName = methodName.substring(beginIndex);
// if the type has both methods:
// boolean isProperty()
// boolean getProperty()
// then #isProperty() takes precedence and we ignore #getProperty()
// (see the JavaBeans spec 1.01)
if (booleanGetter) {
IMethodBinding isMethod = methodBindingNoParameters(methodBinding.getDeclaringClass(), "is" + capitalizedAttributeName); //$NON-NLS-1$
if (isMethod == null) {
return false;
}
if (isMethod.getReturnType().getName().equals("boolean")) { //$NON-NLS-1$
return false;
}
}
IMethodBinding setMethod = methodBindingOneParameter(methodBinding.getDeclaringClass(), "set" + capitalizedAttributeName, returnTypeName); //$NON-NLS-1$
if (setMethod == null) {
return false;
}
if (methodHasBadModifiers(setMethod)) {
return false;
}
if ( ! setMethod.getReturnType().getName().equals("void")) { //$NON-NLS-1$
return false;
}
return true;
}
private static IMethodBinding methodBindingNoParameters(ITypeBinding typeBinding, String methodName) {
for (IMethodBinding method : typeBinding.getDeclaredMethods()) {
if (method.getName().equals(methodName)) {
if (method.getParameterTypes().length == 0) {
return method;
}
}
}
return null;
}
private static IMethodBinding methodBindingOneParameter(ITypeBinding typeBinding, String methodName, String parameterTypeName) {
for (IMethodBinding method : typeBinding.getDeclaredMethods()) {
if (method.getName().equals(methodName)) {
if (method.getParameterTypes().length == 1) {
if (method.getParameterTypes()[0].getQualifiedName().equals(parameterTypeName)) {
return method;
}
}
}
}
return null;
}
/**
* Return whether the specified method's modifiers prevent it
* from being a getter or setter for a "persistent" property.
*/
private static boolean methodHasBadModifiers(IMethodBinding methodBinding) {
if (methodBinding.isConstructor()) {
return true;
}
int modifiers = methodBinding.getModifiers();
if (Modifier.isStatic(modifiers)) {
return true;
}
if (Modifier.isFinal(modifiers)) {
return true;
}
if ( ! (Modifier.isPublic(modifiers) || Modifier.isProtected(modifiers))) {
return true;
}
return false;
}
/**
* Return whether the type may be "persisted", ie marked as Entity, MappedSuperclass, Embeddable
*/
//TODO should persistability be dependent on having a no-arg constructor or should that just be validation?
//seems like final, or a member type being static could be dealt with through validation instead of filtering them out.
public static boolean typeIsPersistable(ITypeBinding typeBinding) {
if (typeBinding.isInterface()) {
return false;
}
if (typeBinding.isAnnotation()) {
return false;
}
if (typeBinding.isEnum()) {
return false;
}
if (typeBinding.isLocal()) {
return false;
}
if (typeBinding.isAnonymous()) {
return false;
}
int modifiers = typeBinding.getModifiers();
if (Modifier.isFinal(modifiers)) {
return false;
}
if (typeBinding.isMember()) {
if (!Modifier.isStatic(modifiers)) {
return false;
}
}
return true;
}
}
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