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60 lines
966 B
60 lines
966 B
package mightypork.utils.math.constraints;
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/**
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* Parametrized implementation of a {@link CachedDigestable}
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*
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* @author Ondřej Hruška (MightyPork)
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* @param <D> digest class
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*/
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public abstract class DigestCache<D> implements CachedDigestable<D> {
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private D last_digest;
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private boolean caching_enabled = false;
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private boolean dirty = true;
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@Override
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public final D digest()
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{
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if (caching_enabled) {
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if (dirty || last_digest == null) {
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last_digest = createDigest();
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dirty = false;
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}
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return last_digest;
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}
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return createDigest();
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}
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/**
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* @return fresh new digest
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*/
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protected abstract D createDigest();
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@Override
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public final void enableDigestCaching(boolean yes)
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{
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caching_enabled = yes;
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markDigestDirty(); // mark dirty
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}
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@Override
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public final boolean isDigestCachingEnabled()
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{
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return caching_enabled;
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}
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@Override
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public final void markDigestDirty()
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{
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dirty = true;
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}
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}
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