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Introduce a `Lookup` on context to be able to reach some Resolver components. Add demo doing it as well (and demo runs with "static" and "sisu" standalone runtimes, but also embedded in maven as "maven-plugin"). Fixes #94
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context/src/main/java/eu/maveniverse/maven/mima/context/Lookup.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,24 @@ | ||
| package eu.maveniverse.maven.mima.context; | ||
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| import java.util.Optional; | ||
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| /** | ||
| * A simple "lookup" that allows to lookup various components. Lookup shares lifecycle with {@link Context}. | ||
| * <p> | ||
| * Note: this component offers access to Resolver internals, but it is up to caller to know really how to use | ||
| * this feature (for example due compatibility reasons). Ideally, you do not want to use this, or use it only | ||
| * in some "advanced scenarios". | ||
| * | ||
| * @since 2.4.10 | ||
| */ | ||
| public interface Lookup { | ||
| /** | ||
| * Performs lookup for component with passed in type, and returns it as optional, never {@code null}. | ||
| */ | ||
| <T> Optional<T> lookup(Class<T> type); | ||
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| /** | ||
| * Performs lookup for component with passed in type and name, and returns it as optional, never {@code null}. | ||
| */ | ||
| <T> Optional<T> lookup(Class<T> type, String name); | ||
| } |
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context/src/main/java/eu/maveniverse/maven/mima/context/internal/IteratingLookup.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,46 @@ | ||
| package eu.maveniverse.maven.mima.context.internal; | ||
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| import static java.util.Objects.requireNonNull; | ||
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| import eu.maveniverse.maven.mima.context.Lookup; | ||
| import java.util.*; | ||
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| /** | ||
| * A {@link Lookup} implementation that is able to iterate through several lookups, applying "first deliver wins" | ||
| * strategy. | ||
| * | ||
| * @since 2.4.10 | ||
| */ | ||
| public final class IteratingLookup implements Lookup { | ||
| private final Collection<Lookup> lookups; | ||
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| public IteratingLookup(Lookup... lookups) { | ||
| this(Arrays.asList(lookups)); | ||
| } | ||
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| public IteratingLookup(Collection<Lookup> lookups) { | ||
| this.lookups = requireNonNull(lookups); | ||
| } | ||
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| @Override | ||
| public <T> Optional<T> lookup(Class<T> type) { | ||
| for (Lookup lookup : lookups) { | ||
| Optional<T> result = lookup.lookup(type); | ||
| if (result.isPresent()) { | ||
| return result; | ||
| } | ||
| } | ||
| return Optional.empty(); | ||
| } | ||
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| @Override | ||
| public <T> Optional<T> lookup(Class<T> type, String name) { | ||
| for (Lookup lookup : lookups) { | ||
| Optional<T> result = lookup.lookup(type, name); | ||
| if (result.isPresent()) { | ||
| return result; | ||
| } | ||
| } | ||
| return Optional.empty(); | ||
| } | ||
| } |
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34 changes: 34 additions & 0 deletions
34
...ed-maven/src/main/java/eu/maveniverse/maven/mima/runtime/maven/internal/PlexusLookup.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,34 @@ | ||
| package eu.maveniverse.maven.mima.runtime.maven.internal; | ||
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| import static java.util.Objects.requireNonNull; | ||
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| import eu.maveniverse.maven.mima.context.Lookup; | ||
| import java.util.Optional; | ||
| import org.codehaus.plexus.PlexusContainer; | ||
| import org.codehaus.plexus.component.repository.exception.ComponentLookupException; | ||
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| public final class PlexusLookup implements Lookup { | ||
| private final PlexusContainer plexusContainer; | ||
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| public PlexusLookup(PlexusContainer plexusContainer) { | ||
| this.plexusContainer = requireNonNull(plexusContainer); | ||
| } | ||
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| @Override | ||
| public <T> Optional<T> lookup(Class<T> type) { | ||
| try { | ||
| return Optional.of(plexusContainer.lookup(type)); | ||
| } catch (ComponentLookupException e) { | ||
| return Optional.empty(); | ||
| } | ||
| } | ||
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| @Override | ||
| public <T> Optional<T> lookup(Class<T> type, String name) { | ||
| try { | ||
| return Optional.of(plexusContainer.lookup(type, name)); | ||
| } catch (ComponentLookupException e) { | ||
| return Optional.empty(); | ||
| } | ||
| } | ||
| } |
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