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HSEARCH-2415 Unify the way we take adaptors into account when introsp…
…ecting bridges
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29 changes: 29 additions & 0 deletions
29
engine/src/main/java/org/hibernate/search/bridge/util/impl/BridgeAdaptor.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,29 @@ | ||
| /* | ||
| * Hibernate Search, full-text search for your domain model | ||
| * | ||
| * License: GNU Lesser General Public License (LGPL), version 2.1 or later | ||
| * See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>. | ||
| */ | ||
| package org.hibernate.search.bridge.util.impl; | ||
|
|
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| import org.hibernate.search.bridge.TwoWayStringBridge; | ||
| import org.hibernate.search.bridge.spi.IgnoreAnalyzerBridge; | ||
|
|
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| /** | ||
| * An interface for bridge adaptors, i.e. types exposing one bridge interface and using | ||
| * another bridge instance under the hood. | ||
| * | ||
| * <p>Implementing this interface allows {@link BridgeAdaptorUtils} to detect | ||
| * specific bridge interfaces ({@link TwoWayStringBridge}, {@link IgnoreAnalyzerBridge}, | ||
| * ...) even when the adaptor does no re-implement the interface. | ||
| * | ||
| * @author Yoann Rodiere | ||
| */ | ||
| public interface BridgeAdaptor { | ||
|
|
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| /** | ||
| * @return The bridge that is directly wrapped by this adaptor. | ||
| */ | ||
| Object unwrap(); | ||
|
|
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| } |
86 changes: 86 additions & 0 deletions
86
engine/src/main/java/org/hibernate/search/bridge/util/impl/BridgeAdaptorUtils.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| /* | ||
| * Hibernate Search, full-text search for your domain model | ||
| * | ||
| * License: GNU Lesser General Public License (LGPL), version 2.1 or later | ||
| * See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>. | ||
| */ | ||
| package org.hibernate.search.bridge.util.impl; | ||
|
|
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| import org.hibernate.search.bridge.ContainerBridge; | ||
| import org.hibernate.search.bridge.TwoWayStringBridge; | ||
| import org.hibernate.search.bridge.spi.IgnoreAnalyzerBridge; | ||
|
|
||
| /** | ||
| * Utilities allowing to take into account bridge adaptors when detecting implemented tagging | ||
| * interface (e.g. {@link IgnoreAnalyzerBridge}) or when trying to make use of specific field | ||
| * interfaces (e.g. {@link TwoWayStringBridge}). | ||
| * | ||
| * @author Yoann Rodiere | ||
| */ | ||
| public final class BridgeAdaptorUtils { | ||
|
|
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| private BridgeAdaptorUtils() { | ||
| // private constructor | ||
| } | ||
|
|
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| /** | ||
| * Return a bridge of the specified type extracted from the given bridge, | ||
| * going through {@link BridgeAdaptor adaptors} and {@link ContainerBridge container bridges} | ||
| * as necessary. | ||
| * | ||
| * <p>The returned object may be the adaptor itself, or its delegate, or a delegate of | ||
| * its delegate, and so on. | ||
| * <p>If neither the adaptor or one of its delegates is an instance of the specified type, | ||
| * {@code null} is returned. | ||
| * | ||
| * @param bridge The bridge to use as a starting point. | ||
| * @param clazz The expected bridge type. | ||
| * @return A unwrapped bridge implementing the expected bridge type, or {@code null} | ||
| * if none could be found. | ||
| */ | ||
| public static <T> T unwrapAdaptorAndContainer(Object bridge, Class<T> clazz) { | ||
| if ( clazz.isInstance( bridge ) ) { | ||
| return clazz.cast( bridge ); | ||
| } | ||
| else if ( bridge instanceof BridgeAdaptor ) { | ||
| Object delegate = ( (BridgeAdaptor) bridge ).unwrap(); | ||
| return unwrapAdaptorAndContainer( delegate, clazz ); | ||
| } | ||
| else if ( bridge instanceof ContainerBridge ) { | ||
| Object delegate = ( (ContainerBridge) bridge ).getElementBridge(); | ||
| return unwrapAdaptorAndContainer( delegate, clazz ); | ||
| } | ||
| else { | ||
| return null; | ||
| } | ||
| } | ||
|
|
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| /** | ||
| * Return a bridge of the specified type extracted from the given bridge, | ||
| * going through {@link BridgeAdaptor adaptors} as necessary, never going | ||
| * through {@link ContainerBridge container bridges}. | ||
| * | ||
| * <p>The returned object may be the adaptor itself, or its delegate, or a delegate of | ||
| * its delegate, and so on. | ||
| * <p>If neither the adaptor or one of its delegates is an instance of the specified type, | ||
| * {@code null} is returned. | ||
| * | ||
| * @param bridge The bridge to use as a starting point. | ||
| * @param clazz The expected bridge type. | ||
| * @return A unwrapped bridge implementing the expected bridge type, or {@code null} | ||
| * if none could be found. | ||
| */ | ||
| public static <T> T unwrapAdaptorOnly(Object bridge, Class<T> clazz) { | ||
| if ( clazz.isInstance( bridge ) ) { | ||
| return clazz.cast( bridge ); | ||
| } | ||
| else if ( bridge instanceof BridgeAdaptor ) { | ||
| Object delegate = ( (BridgeAdaptor) bridge ).unwrap(); | ||
| return unwrapAdaptorOnly( delegate, clazz ); | ||
| } | ||
| else { | ||
| return null; | ||
| } | ||
| } | ||
|
|
||
| } |
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