common/device-side/bedstead/queryable/src/main/java/com/android/queryable/queries/SerializableQueryHelper.java

/*
 * Copyright (C) 2021 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.queryable.queries;

import com.android.queryable.Queryable;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

/** Implementation of {@link SerializableQuery}. */
public final class SerializableQueryHelper<E extends Queryable>
        implements SerializableQuery<E>, Serializable {

    private final E mQuery;
    private Serializable mEqualsValue;

    SerializableQueryHelper() {
        mQuery = (E) this;
    }

    public SerializableQueryHelper(E query) {
        mQuery = query;
    }

    @Override
    public E isEqualTo(Serializable serializable) {
        this.mEqualsValue = serializable;
        return mQuery;
    }

    @Override
    public boolean matches(Serializable value) {
        if (mEqualsValue != null && !mEqualsValue.equals(value)) {
            return false;
        }

        return true;
    }

    @Override
    public String describeQuery(String fieldName) {
        List<String> queryStrings = new ArrayList<>();
        if (mEqualsValue != null) {
            queryStrings.add(fieldName + "=" + mEqualsValue);
        }

        return Queryable.joinQueryStrings(queryStrings);
    }
}