be.fror.ecs.Engine.java Source code

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Here is the source code for be.fror.ecs.Engine.java

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/*
 * Copyright 2015 Olivier Grgoire.
 *
 * 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 be.fror.ecs;

import com.google.common.collect.ImmutableMap;

import java.lang.reflect.Type;
import java.util.Arrays;
import java.util.Set;

/**
 *
 * @author Olivier Grgoire
 */
public final class Engine {

    final Component[][] components;
    final Processor[] processors;
    final ImmutableMap<Type, ComponentMapper<?>> componentMappers;

    Engine(EngineBuilder builder) {
        components = new Component[builder.componentTypes.size()][32];
        processors = builder.processors.toArray(new Processor[0]);
        {
            ImmutableMap.Builder<Type, ComponentMapper<?>> componentMappersBuilder = ImmutableMap.builder();
            int i = 0;
            for (Type c : builder.componentTypes) {
                componentMappersBuilder.put(c, new ComponentMapper(this, i));
                i++;
            }
            componentMappers = componentMappersBuilder.build();
        }
    }

    public void process() {
        for (int i = 0; i < processors.length; i++) {
            processors[i].doProcess();
        }
    }

    void setComponent(int componentId, int entityId, Component component) {
        Component[] c = components[componentId];
        if (c.length <= entityId) {
            components[componentId] = c = Arrays.copyOf(c, Integer.highestOneBit(entityId) << 1);
        }
        c[entityId] = component;
    }

}