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/*
* Copyright 2000-2012 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.intellij.psi.impl.source.resolve.reference.impl;
import com.intellij.codeInsight.completion.InsertHandler;
import com.intellij.codeInsight.completion.InsertionContext;
import com.intellij.codeInsight.completion.JavaLookupElementBuilder;
import com.intellij.codeInsight.lookup.LookupElement;
import com.intellij.codeInsight.lookup.LookupElementBuilder;
import com.intellij.openapi.project.Project;
import com.intellij.psi.*;
import com.intellij.psi.codeStyle.JavaCodeStyleManager;
import com.intellij.psi.impl.source.PsiClassReferenceType;
import com.intellij.psi.search.GlobalSearchScope;
import com.intellij.psi.util.*;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.util.ArrayList;
import java.util.List;
/**
* @author Konstantin Bulenkov
*/
public class JavaLangClassMemberReference extends PsiReferenceBase<PsiLiteralExpression> implements InsertHandler<LookupElement> {
private final PsiExpression myContext;
public JavaLangClassMemberReference(PsiLiteralExpression literal, PsiExpression context) {
super(literal);
myContext = context;
}
@Override
public PsiElement resolve() {
final String name = (String)getElement().getValue();
final Type type = getType();
if (type != null) {
final PsiClass psiClass = getPsiClass();
if (psiClass != null) {
PsiMember member;
if (type == Type.FIELD || type == Type.DECLARED_FIELD) {
member = psiClass.findFieldByName(name, false);
} else {
final PsiMethod[] methods = psiClass.findMethodsByName(name, false);
member = methods.length == 0 ? null : methods[0];
}
return member;
}
}
return null;
}
@Nullable
private PsiClass getPsiClass() {
if (myContext instanceof PsiClassObjectAccessExpression) {
return PsiTypesUtil.getPsiClass(((PsiClassObjectAccessExpression)myContext).getOperand().getType());
} else if (myContext instanceof PsiMethodCallExpression) {
final PsiMethod method = ((PsiMethodCallExpression)myContext).resolveMethod();
if (method != null && "forName".equals(method.getName()) && isClass(method.getContainingClass())) {
final PsiExpression[] expressions = ((PsiMethodCallExpression)myContext).getArgumentList().getExpressions();
if (expressions.length == 1 && expressions[0] instanceof PsiLiteralExpression) {
final Object value = ((PsiLiteralExpression)expressions[0]).getValue();
if (value instanceof String) {
final Project project = myContext.getProject();
return JavaPsiFacade.getInstance(project).findClass(String.valueOf(value), GlobalSearchScope.allScope(project));
}
}
}
}
return null;
}
private static boolean isClass(PsiClass aClass) {
return aClass != null && CommonClassNames.JAVA_LANG_CLASS.equals(aClass.getQualifiedName());
}
@Nullable
private Type getType() {
boolean selfFound = false;
for (PsiElement child : myContext.getParent().getChildren()) {
if (!selfFound) {
if (child == myContext) {
selfFound = true;
}
continue;
}
if (child instanceof PsiIdentifier) {
return Type.fromString(child.getText());
}
}
return null;
}
@NotNull
@Override
public Object[] getVariants() {
final Type type = getType();
final PsiClass psiClass = getPsiClass();
if (psiClass != null && type != null) {
if (type == Type.DECLARED_FIELD) {
return psiClass.getFields();
} else if (type == Type.FIELD) {
final List<PsiField> fields = new ArrayList<PsiField>();
for (PsiField field : psiClass.getFields()) {
if (isPublic(field)) {
fields.add(field);
}
}
return fields.toArray();
} else if (type == Type.DECLARED_METHOD || type == Type.METHOD) {
final List<LookupElementBuilder> elements = new ArrayList<LookupElementBuilder>();
for (PsiMethod method : psiClass.getMethods()) {
if (type == Type.DECLARED_METHOD || isPublic(method)) {
elements.add(JavaLookupElementBuilder.forMethod(method, PsiSubstitutor.EMPTY).withInsertHandler(this));
}
}
return elements.toArray();
}
}
return EMPTY_ARRAY;
}
@Override
public void handleInsert(InsertionContext context, LookupElement item) {
final Object object = item.getObject();
if (object instanceof PsiMethod) {
final PsiElement newElement = PsiUtilCore.getElementAtOffset(context.getFile(), context.getStartOffset());
final int start = newElement.getTextRange().getEndOffset();
final PsiElement params = newElement.getParent().getParent();
final int end = params.getTextRange().getEndOffset() - 1;
final String types = getMethodTypes((PsiMethod)object);
context.getDocument().replaceString(start, end, types);
context.commitDocument();
final PsiElement firstParam = PsiUtilCore.getElementAtOffset(context.getFile(), context.getStartOffset());
final PsiMethodCallExpression methodCall = PsiTreeUtil.getParentOfType(firstParam, PsiMethodCallExpression.class);
if (methodCall != null) {
JavaCodeStyleManager.getInstance(context.getProject()).shortenClassReferences(methodCall);
}
}
}
private static boolean isPublic(final PsiMember psiField) {
return psiField.hasModifierProperty(PsiModifier.PUBLIC);
}
private static String getMethodTypes(PsiMethod method) {
final StringBuilder buf = new StringBuilder();
for (PsiParameter parameter : method.getParameterList().getParameters()) {
buf.append(", ").append(TypeConversionUtil.erasure(parameter.getType()).getPresentableText()).append(".class");
}
return buf.toString();
}
enum Type {
FIELD, DECLARED_FIELD, METHOD, DECLARED_METHOD;
@Nullable
static Type fromString(String s) {
if ("getField".equals(s)) return FIELD;
if ("getDeclaredField".equals(s)) return DECLARED_FIELD;
if ("getMethod".equals(s)) return METHOD;
if ("getDeclaredMethod".equals(s)) return DECLARED_METHOD;
return null;
}
}
}
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