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Gradle 6.5 API redistribution.

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/*
 * Copyright 2020 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.initialization;

import com.google.common.collect.ImmutableMap;
import org.gradle.api.internal.properties.GradleProperties;

import javax.annotation.Nullable;
import java.util.HashMap;
import java.util.Map;

class DefaultGradleProperties implements GradleProperties {
    final Map defaultProperties;
    final Map overrideProperties;
    final ImmutableMap gradleProperties;

    public DefaultGradleProperties(Map defaultProperties, Map overrideProperties) {
        this.defaultProperties = defaultProperties;
        this.overrideProperties = overrideProperties;
        gradleProperties = immutablePropertiesWith(ImmutableMap.of());
    }

    @Nullable
    @Override
    public String find(String propertyName) {
        return gradleProperties.get(propertyName);
    }

    @Override
    public Map mergeProperties(Map properties) {
        return properties.isEmpty()
            ? gradleProperties
            : immutablePropertiesWith(properties);
    }

    ImmutableMap immutablePropertiesWith(Map properties) {
        return ImmutableMap.copyOf(mergePropertiesWith(properties));
    }

    Map mergePropertiesWith(Map properties) {
        Map result = new HashMap<>();
        result.putAll(defaultProperties);
        result.putAll(properties);
        result.putAll(overrideProperties);
        return result;
    }
}