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PsiAnnotationUtil.java
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PsiAnnotationUtil.java
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package de.plushnikov.intellij.plugin.util;
import com.intellij.openapi.util.text.StringUtil;
import com.intellij.psi.*;
import com.intellij.psi.util.PsiTreeUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.lang.annotation.Annotation;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.regex.Pattern;
/**
* Some util methods for annotation processing
*
* @author peichhorn
* @author Plushnikov Michail
*/
public class PsiAnnotationUtil {
@NotNull
public static PsiAnnotation createPsiAnnotation(@NotNull PsiModifierListOwner psiModifierListOwner, @NotNull Class<? extends Annotation> annotationClass) {
return createPsiAnnotation(psiModifierListOwner, annotationClass, "");
}
@NotNull
public static PsiAnnotation createPsiAnnotation(@NotNull PsiModifierListOwner psiModifierListOwner, @NotNull Class<? extends Annotation> annotationClass, @Nullable String value) {
final PsiElementFactory elementFactory = JavaPsiFacade.getElementFactory(psiModifierListOwner.getProject());
final PsiClass psiClass = PsiTreeUtil.getParentOfType(psiModifierListOwner, PsiClass.class);
final String valueString = StringUtil.isNotEmpty(value) ? "(" + value + ")" : "";
return elementFactory.createAnnotationFromText("@" + annotationClass.getName() + valueString, psiClass);
}
@NotNull
public static <T> Collection<T> getAnnotationValues(@NotNull PsiAnnotation psiAnnotation, @NotNull String parameter, @NotNull Class<T> asClass) {
Collection<T> result = Collections.emptyList();
PsiAnnotationMemberValue attributeValue = psiAnnotation.findAttributeValue(parameter);
if (attributeValue instanceof PsiArrayInitializerMemberValue) {
final PsiAnnotationMemberValue[] memberValues = ((PsiArrayInitializerMemberValue) attributeValue).getInitializers();
result = new ArrayList<T>(memberValues.length);
for (PsiAnnotationMemberValue memberValue : memberValues) {
T value = resolveElementValue(memberValue, asClass);
if (null != value) {
result.add(value);
}
}
} else if (null != attributeValue) {
T value = resolveElementValue(attributeValue, asClass);
if (null != value) {
result = Collections.singletonList(value);
}
}
return result;
}
public static boolean hasDeclaredProperty(@NotNull PsiAnnotation psiAnnotation, @NotNull String parameter) {
return null != psiAnnotation.findDeclaredAttributeValue(parameter);
}
public static boolean getBooleanAnnotationValue(@NotNull PsiAnnotation psiAnnotation, @NotNull String parameter, boolean defaultValue) {
PsiAnnotationMemberValue attrValue = psiAnnotation.findAttributeValue(parameter);
final Boolean result = null != attrValue ? resolveElementValue(attrValue, Boolean.class) : null;
return result == null ? defaultValue : result;
}
public static String getStringAnnotationValue(@NotNull PsiAnnotation psiAnnotation, @NotNull String parameter) {
PsiAnnotationMemberValue attrValue = psiAnnotation.findAttributeValue(parameter);
return null != attrValue ? resolveElementValue(attrValue, String.class) : null;
}
@Nullable
private static <T> T resolveElementValue(@NotNull PsiElement psiElement, @NotNull Class<T> asClass) {
T value = null;
if (psiElement instanceof PsiReferenceExpression) {
final PsiElement resolved = ((PsiReferenceExpression) psiElement).resolve();
if (resolved instanceof PsiEnumConstant) {
final PsiEnumConstant psiEnumConstant = (PsiEnumConstant) resolved;
//Enums are supported as VALUE-Strings only
if (asClass.isAssignableFrom(String.class)) {
value = (T) psiEnumConstant.getName();
}
} else if (resolved instanceof PsiVariable) {
final PsiVariable psiVariable = (PsiVariable) resolved;
Object elementValue = psiVariable.computeConstantValue();
if (null != elementValue && asClass.isAssignableFrom(elementValue.getClass())) {
value = (T) elementValue;
}
}
} else if (psiElement instanceof PsiLiteralExpression) {
Object elementValue = ((PsiLiteralExpression) psiElement).getValue();
if (null != elementValue && asClass.isAssignableFrom(elementValue.getClass())) {
value = (T) elementValue;
}
} else if (psiElement instanceof PsiClassObjectAccessExpression) {
PsiTypeElement elementValue = ((PsiClassObjectAccessExpression) psiElement).getOperand();
//Enums are supported as VALUE-Strings only
if (asClass.isAssignableFrom(PsiType.class)) {
value = (T) elementValue.getType();
}
} else if (psiElement instanceof PsiAnnotation) {
if (asClass.isAssignableFrom(PsiAnnotation.class)) {
value = (T) psiElement;
}
} else if (psiElement instanceof PsiPrefixExpression) {
if (asClass.isAssignableFrom(String.class)) {
String expressionText = psiElement.getText();
value = (T) expressionText;
}
}
return value;
}
@Nullable
public static Boolean getDeclaredBooleanAnnotationValue(@NotNull PsiAnnotation psiAnnotation, @NotNull String parameter) {
PsiAnnotationMemberValue attributeValue = psiAnnotation.findDeclaredAttributeValue(parameter);
Object constValue = null;
if (null != attributeValue) {
final JavaPsiFacade javaPsiFacade = JavaPsiFacade.getInstance(psiAnnotation.getProject());
constValue = javaPsiFacade.getConstantEvaluationHelper().computeConstantExpression(attributeValue);
}
return constValue instanceof Boolean ? (Boolean) constValue : null;
}
@NotNull
public static Collection<String> collectAnnotationsToCopy(@NotNull PsiField psiField, final Pattern... patterns) {
Collection<String> annotationsToCopy = new ArrayList<String>();
PsiModifierList modifierList = psiField.getModifierList();
if (null != modifierList) {
for (PsiAnnotation psiAnnotation : modifierList.getAnnotations()) {
final String annotationName = PsiAnnotationSearchUtil.getSimpleNameOf(psiAnnotation);
for (Pattern pattern : patterns) {
if (pattern.matcher(annotationName).matches()) {
annotationsToCopy.add(psiAnnotation.getQualifiedName());
}
}
}
}
return annotationsToCopy;
}
}