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## org.apache.ivy.plugins.resolver
Class DualResolver

    java.lang.Object
      org.apache.ivy.plugins.resolver.AbstractResolver
          org.apache.ivy.plugins.resolver.DualResolver

All Implemented Interfaces:
  Validatable, DependencyResolver, HasLatestStrategy

    public class DualResolver

extends AbstractResolver

DualResolver is used to resolve dependencies with one dependency revolver, called ivy resolver, and then download artifacts found in the resolved dependencies from a second dependency resolver, called artifact resolver. It is especially useful with resolvers using repository where there is a lot of artifact, but no ivy file, like the maven ibiblio repository. If no ivy file is found by the ivy resolver, the artifact resolver is used to check if there is artifact corresponding to the request (with default ivy file). For artifact download, however, only the artifact resolver is used. Exactly two resolvers should be added to this resolver for it to work properly. The first resolver added if the ivy resolver, the second is the artifact one.

Field Summary
`static java.lang.String` | `DESCRIPTOR_OPTIONAL`
`static java.lang.String` | `DESCRIPTOR_REQUIRED`

Constructor Summary
`DualResolver()`

Method Summary
`void` | `abortPublishTransaction()`
`void` | `add(DependencyResolver resolver)`
`void` | `beginPublishTransaction(ModuleRevisionId module, boolean overwrite)`
`void` | `commitPublishTransaction()`
`DownloadReport` | `download(Artifact[] artifacts, DownloadOptions options)` Download artifacts with specified DownloadOptions.
`ArtifactDownloadReport` | `download(ArtifactOrigin artifact, DownloadOptions options)` Default implementation downloads the artifact without taking advantage of its location
`void` | `dumpSettings()`
`boolean` | `exists(Artifact artifact)` Returns `true` if the given artifact can be located by this resolver and actually exist.
`ResolvedResource` | `findIvyFileRef(DependencyDescriptor dd, ResolveData data)` Finds the module descriptor for the specified `DependencyDescriptor`.
`DependencyResolver` | `getArtifactResolver()`
`ResolvedModuleRevision` | `getDependency(DependencyDescriptor dd, ResolveData data)` Resolve a module by id, getting its module descriptor and resolving the revision if it's a latest one (i.e. a revision uniquely identifying the revision of a module in the current environment - If this revision is not able to identify uniquelely the revision of the module outside of the current environment, then the resolved revision must begin by ##)
`DependencyResolver` | `getIvyResolver()`
`boolean` | `isAllownomd()`
`ArtifactOrigin` | `locate(Artifact artifact)` Default implementation actually download the artifact Subclasses should overwrite this to avoid the download
`void` | `publish(Artifact artifact, java.io.File src, boolean overwrite)`
`void` | `reportFailure()` Reports last resolve failure as Messages
`void` | `reportFailure(Artifact art)` Reports last artifact download failure as Messages
`void` | `setAllownomd(boolean allownomd)`
`void` | `setArtifactResolver(DependencyResolver artifactResolver)`
`void` | `setDescriptor(java.lang.String descriptorRule)` Sets the module descriptor presence rule.
`void` | `setIvyResolver(DependencyResolver ivyResolver)`

Methods inherited from class org.apache.ivy.plugins.resolver.AbstractResolver
`checkInterrupted, checkLatest, doValidate, findModuleInCache, findModuleInCache, fromSystem, fromSystem, getCacheDownloadOptions, getCacheOptions, getChangingMatcherName, getChangingPattern, getDownloadOptions, getEventManager, getLatest, getLatestStrategy, getName, getNamespace, getParserSettings, getRepositoryCacheManager, getSettings, getSystemNode, getTypeName, hidePassword, isAfter, isValidate, listModules, listOrganisations, listRevisions, listTokenValues, listTokenValues, saveModuleRevisionIfNeeded, setCache, setChangingMatcher, setChangingPattern, setCheckmodified, setEventManager, setLatest, setLatestStrategy, setName, setNamespace, setRepositoryCacheManager, setSettings, setValidate, toString, toSystem, toSystem, toSystem, toSystem, toSystem, toSystem, validate`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

### DESCRIPTOR_OPTIONAL

    public static final java.lang.String DESCRIPTOR_OPTIONAL

See Also:
  Constant Field Values

### DESCRIPTOR_REQUIRED

    public static final java.lang.String DESCRIPTOR_REQUIRED

See Also:
  Constant Field Values

Constructor Detail

### DualResolver

    public DualResolver()

Method Detail

### add

    public void add(DependencyResolver resolver)

### getDependency

    public ResolvedModuleRevision getDependency(DependencyDescriptor dd,
                                                ResolveData data)
                                         throws java.text.ParseException

  Description copied from interface: `DependencyResolver`
  Resolve a module by id, getting its module descriptor and resolving the revision if it's a latest one (i.e. a revision uniquely identifying the revision of a module in the current environment - If this revision is not able to identify uniquelely the revision of the module outside of the current environment, then the resolved revision must begin by ##)

  Throws:
    `java.text.ParseException`

### findIvyFileRef

    public ResolvedResource findIvyFileRef(DependencyDescriptor dd,
                                           ResolveData data)

  Description copied from interface: `DependencyResolver`
  Finds the module descriptor for the specified `DependencyDescriptor`. If this resolver can't find the module descriptor, `null` is returned.

  Parameters:
    `dd` - the dependency descriptor
    `data` - the resolve data
  Returns:
    the module descriptor, or `null`

### reportFailure

    public void reportFailure()

  Description copied from interface: `DependencyResolver`
  Reports last resolve failure as Messages

  Specified by:
    `reportFailure` in interface `DependencyResolver`
  Overrides:
    `reportFailure` in class `AbstractResolver`

### reportFailure

    public void reportFailure(Artifact art)

  Description copied from interface: `DependencyResolver`
  Reports last artifact download failure as Messages

  Specified by:
    `reportFailure` in interface `DependencyResolver`
  Overrides:
    `reportFailure` in class `AbstractResolver`

### download

    public DownloadReport download(Artifact[] artifacts,
                                   DownloadOptions options)

  Description copied from interface: `DependencyResolver`
  Download artifacts with specified DownloadOptions.

  The resolver will always make a best effort, and do not stop when an artifact is not available. It rather continue to attempt to download other requested artifacts, and report what has been done in the returned DownloadReport.

  The returned DownloadReport is never `null`, and always contain an `ArtifactDownloadReport` for each requested Artifact.

  Parameters:
    `artifacts` - an array of artifacts to download. Must not be `null`.
    `options` - options to apply for this download. Must not be `null`.
  Returns:
    a DownloadReport with details about each Artifact download.

### getArtifactResolver

    public DependencyResolver getArtifactResolver()

### setArtifactResolver

    public void setArtifactResolver(DependencyResolver artifactResolver)

### getIvyResolver

    public DependencyResolver getIvyResolver()

### setIvyResolver

    public void setIvyResolver(DependencyResolver ivyResolver)

### publish

    public void publish(Artifact artifact,
                        java.io.File src,
                        boolean overwrite)
                 throws java.io.IOException

  Throws:
    `java.io.IOException`

### abortPublishTransaction

    public void abortPublishTransaction()
                                 throws java.io.IOException

  Specified by:
    `abortPublishTransaction` in interface `DependencyResolver`
  Overrides:
    `abortPublishTransaction` in class `AbstractResolver`
  Throws:
    `java.io.IOException`

### beginPublishTransaction

    public void beginPublishTransaction(ModuleRevisionId module,
                                        boolean overwrite)
                                 throws java.io.IOException

  Specified by:
    `beginPublishTransaction` in interface `DependencyResolver`
  Overrides:
    `beginPublishTransaction` in class `AbstractResolver`
  Throws:
    `java.io.IOException`

### commitPublishTransaction

    public void commitPublishTransaction()
                                  throws java.io.IOException

  Specified by:
    `commitPublishTransaction` in interface `DependencyResolver`
  Overrides:
    `commitPublishTransaction` in class `AbstractResolver`
  Throws:
    `java.io.IOException`

### dumpSettings

    public void dumpSettings()

  Specified by:
    `dumpSettings` in interface `DependencyResolver`
  Overrides:
    `dumpSettings` in class `AbstractResolver`

### exists

    public boolean exists(Artifact artifact)

  Description copied from interface: `DependencyResolver`
  Returns `true` if the given artifact can be located by this resolver and actually exist.

  Specified by:
    `exists` in interface `DependencyResolver`
  Overrides:
    `exists` in class `AbstractResolver`
  Parameters:
    `artifact` - the artifact which should be tested.
  Returns:
    `true` if the given artifact can be located by this resolver and actually exist.

### locate

    public ArtifactOrigin locate(Artifact artifact)

  Description copied from class: `AbstractResolver`
  Default implementation actually download the artifact Subclasses should overwrite this to avoid the download

  Specified by:
    `locate` in interface `DependencyResolver`
  Overrides:
    `locate` in class `AbstractResolver`
  Parameters:
    `artifact` - the artifact which should be located
  Returns:
    the artifact location, or `null` if it can't be located by this resolver or doesn't exist.

### download

    public ArtifactDownloadReport download(ArtifactOrigin artifact,
                                           DownloadOptions options)

  Description copied from class: `AbstractResolver`
  Default implementation downloads the artifact without taking advantage of its location

  Specified by:
    `download` in interface `DependencyResolver`
  Overrides:
    `download` in class `AbstractResolver`
  Parameters:
    `artifact` - the location of the artifact to download. Must not be `null`.
    `options` - options to apply for this download. Must not be `null`.
  Returns:
    a report detailing how the download has gone, is never `null`.

### isAllownomd

    public boolean isAllownomd()

### setAllownomd

    public void setAllownomd(boolean allownomd)

### setDescriptor

    public void setDescriptor(java.lang.String descriptorRule)

  Sets the module descriptor presence rule. Should be one of `DESCRIPTOR_REQUIRED` or `DESCRIPTOR_OPTIONAL`.

  Parameters:
    `descriptorRule` - the descriptor rule to use with this resolver.

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