com.codecrate.shard.modifier.ModifiableObject.java Source code

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Here is the source code for com.codecrate.shard.modifier.ModifiableObject.java

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/*
 * Copyright 2004 codecrate consulting
 *
 *  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.codecrate.shard.modifier;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * 
 * @author <a href="mailto:wireframe@dev.java.net">Ryan Sonnek</a>
 */
public class ModifiableObject implements Modifiable, ModifierListenerContainer {
    private static final Log LOG = LogFactory.getLog(ModifiableObject.class);

    private int baseValue;
    private Map<ModifierType, ModifierContainer> modifiers = new HashMap<ModifierType, ModifierContainer>();
    private CompositeModifierListener listeners = new CompositeModifierListener();

    public ModifiableObject() {
        this(0);
    }

    public ModifiableObject(int baseValue) {
        this.baseValue = baseValue;
    }

    public int getValue() {
        return baseValue;
    }

    public int getModifiedValue() {
        int value = baseValue;

        for (ModifierType type : modifiers.keySet()) {
            ModifierContainer container = modifiers.get(type);
            value += type.calculateModifier(container.getModifiers());
        }
        return value;
    }

    public void addModifier(Modifier modifier) {
        ModifierType type = modifier.getModifierType();
        ModifierContainer container = getModifierContainer(type);
        container.addModifier(modifier);
        updateModifier(type, container);
    }

    public void removeModifier(Modifier modifier) {
        ModifierType type = modifier.getModifierType();
        ModifierContainer container = getModifierContainer(type);
        container.removeModifier(modifier);
        updateModifier(type, container);
    }

    protected ModifierContainer getModifierContainer(ModifierType type) {
        ModifierContainer container = modifiers.get(type);
        if (null == container) {
            LOG.debug("No modifiers found for type: " + type);
            container = new DefaultModifierContainer();
        }
        return container;
    }

    private void updateModifier(ModifierType type, ModifierContainer container) {
        modifiers.put(type, container);
        listeners.onModify();
    }

    public Collection<Modifier> getModifiers() {
        Collection<Modifier> results = new ArrayList<Modifier>();
        for (ModifierContainer container : modifiers.values()) {
            results.addAll(container.getModifiers());
        }
        return results;
    }

    /**
     * @param listener
     */
    public void addListener(ModifierListener listener) {
        listeners.addListener(listener);
    }

    /**
     * @return
     */
    public Collection<ModifierListener> getListeners() {
        return listeners.getListeners();
    }

    /**
     * @param listener
     */
    public void removeListener(ModifierListener listener) {
        listeners.removeListener(listener);
    }

    /**
     * @param i
     */
    public void setValue(int newValue) {
        this.baseValue = newValue;
    }
}