/*
 * Copyright 2017 the original author or authors.
 *
 * 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 org.gradle.internal.snapshot.impl;

import com.google.common.collect.ImmutableList;
import org.gradle.internal.snapshot.ValueSnapshot;
import org.gradle.internal.snapshot.ValueSnapshotter;

public class ArrayValueSnapshot extends AbstractArraySnapshot<ValueSnapshot> implements ValueSnapshot {
    public static final ArrayValueSnapshot EMPTY = new ArrayValueSnapshot(ImmutableList.of());

    public ArrayValueSnapshot(ImmutableList<ValueSnapshot> elements) {
        super(elements);
    }

    @Override
    public ValueSnapshot snapshot(Object value, ValueSnapshotter snapshotter) {
        ValueSnapshot other = snapshotter.snapshot(value);
        if (isEqualArrayValueSnapshot(other)) {
            return this;
        }
        return other;
    }

    private boolean isEqualArrayValueSnapshot(ValueSnapshot other) {
        if (other instanceof ArrayValueSnapshot) {
            ArrayValueSnapshot otherArray = (ArrayValueSnapshot) other;
            if (elements.equals(otherArray.elements)) {
                return true;
            }
        }
        return false;
    }
}
