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135 lines
2.8 KiB
135 lines
2.8 KiB
package mightypork.gamecore.resources;
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import java.io.IOException;
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import mightypork.utils.annotations.Alias;
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import mightypork.utils.interfaces.Destroyable;
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import mightypork.utils.logging.Log;
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import mightypork.utils.math.timing.Profiler;
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import mightypork.utils.string.StringUtil;
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/**
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* Deferred resource abstraction.
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*
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* @author Ondřej Hruška (MightyPork)
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*/
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@Alias(name = "Resource")
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public abstract class BaseLazyResource implements LazyResource, Destroyable {
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private final String resource;
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private volatile boolean loadFailed = false;
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private volatile boolean loadAttempted = false;
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/**
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* @param resource resource path / name; this string is later used in
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* loadResource()
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*/
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public BaseLazyResource(String resource) {
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this.resource = resource;
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}
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@Override
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public synchronized final void load()
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{
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if (!loadFailed && loadAttempted) return;
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//
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// if (loadFailed) return;
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// if (loadAttempted) return;
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//
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loadAttempted = true;
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loadFailed = false;
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try {
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if (resource == null) {
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throw new NullPointerException("Resource string cannot be null for non-null resource.");
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}
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final long time = Profiler.begin();
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Log.f3("(res) + Load: " + this);
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loadResource(resource);
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Log.f3("(res) - Done: " + this + " in " + Profiler.endStr(time));
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} catch (final Throwable t) {
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loadFailed = true;
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Log.e("(res) Failed to load: " + this, t);
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}
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}
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@Override
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public synchronized final boolean isLoaded()
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{
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return loadAttempted && !loadFailed;
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}
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/**
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* Check if the resource is loaded; if not, try to do so.
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*
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* @return true if it's loaded now.
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*/
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public synchronized final boolean ensureLoaded()
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{
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if (isLoaded()) {
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return true;
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} else {
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if (loadFailed) return false;
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Log.f3("(res) !! Loading on access: " + this);
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load();
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}
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return isLoaded();
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}
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/**
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* Load the resource. Called from load() - once only.
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*
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* @param resource the path / name of a resource
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* @throws IOException when some problem prevented the resource from being
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* loaded.
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*/
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protected abstract void loadResource(String resource) throws IOException;
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@Override
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public abstract void destroy();
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@Override
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public String toString()
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{
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return StringUtil.fromLastChar(resource, '/');
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}
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@Override
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public int hashCode()
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{
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final int prime = 31;
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int result = 1;
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result = prime * result + ((resource == null) ? 0 : resource.hashCode());
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return result;
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}
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@Override
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public boolean equals(Object obj)
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{
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if (this == obj) return true;
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if (obj == null) return false;
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if (!(obj instanceof BaseLazyResource)) return false;
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final BaseLazyResource other = (BaseLazyResource) obj;
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if (resource == null) {
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if (other.resource != null) return false;
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} else if (!resource.equals(other.resource)) return false;
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return true;
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}
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}
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