com.android.tools.idea.databinding.DataBindingComponentClassFinder.java Source code

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Here is the source code for com.android.tools.idea.databinding.DataBindingComponentClassFinder.java

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/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * 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.android.tools.idea.databinding;

import com.android.SdkConstants;
import com.google.common.base.Predicate;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import com.intellij.psi.PsiClass;
import com.intellij.psi.PsiElementFinder;
import com.intellij.psi.PsiManager;
import com.intellij.psi.search.GlobalSearchScope;
import com.intellij.psi.util.CachedValue;
import com.intellij.psi.util.CachedValueProvider;
import com.intellij.psi.util.CachedValuesManager;
import com.intellij.psi.util.PsiModificationTracker;
import org.jetbrains.android.facet.AndroidFacet;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.List;

public class DataBindingComponentClassFinder extends PsiElementFinder {
    private final DataBindingProjectComponent myComponent;
    private CachedValue<List<PsiClass>> myClasses;

    public DataBindingComponentClassFinder(final DataBindingProjectComponent component) {
        myComponent = component;
        myClasses = CachedValuesManager.getManager(component.getProject()).createCachedValue(() -> {
            List<PsiClass> classes = Lists.newArrayList();
            for (AndroidFacet facet : myComponent.getDataBindingEnabledFacets()) {
                if (facet.isLibraryProject()) {
                    continue;
                }
                classes.add(
                        new LightGeneratedComponentClass(PsiManager.getInstance(component.getProject()), facet));
            }
            return CachedValueProvider.Result.create(classes, myComponent,
                    PsiModificationTracker.JAVA_STRUCTURE_MODIFICATION_COUNT);
        }, false);

    }

    @Nullable
    @Override
    public PsiClass findClass(@NotNull String qualifiedName, @NotNull final GlobalSearchScope scope) {
        if (!isEnabled() || !SdkConstants.CLASS_DATA_BINDING_COMPONENT.equals(qualifiedName)) {
            return null;
        }
        return Iterables.tryFind(myClasses.getValue(), input -> check(input, scope)).orNull();
    }

    @NotNull
    @Override
    public PsiClass[] findClasses(@NotNull String qualifiedName, @NotNull final GlobalSearchScope scope) {
        if (!isEnabled() || !SdkConstants.CLASS_DATA_BINDING_COMPONENT.equals(qualifiedName)) {
            return PsiClass.EMPTY_ARRAY;
        }
        Iterable<PsiClass> filtered = Iterables.filter(myClasses.getValue(), input -> check(input, scope));
        if (filtered.iterator().hasNext()) {
            return Iterables.toArray(filtered, PsiClass.class);
        }
        return PsiClass.EMPTY_ARRAY;
    }

    private static boolean check(@Nullable PsiClass psiClass, @NotNull GlobalSearchScope scope) {
        return psiClass != null && psiClass.getProject() == scope.getProject();
    }

    private boolean isEnabled() {
        return DataBindingUtil.inMemoryClassGenerationIsEnabled() && myComponent.hasAnyDataBindingEnabledFacet();
    }
}