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

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

All Implemented Interfaces:
  Validatable, DependencyResolver, HasLatestStrategy

    public class ChainResolver

extends AbstractResolver

Nested Class Summary
`static class` | `ChainResolver.ResolvedModuleRevisionArtifactInfo`

Constructor Summary
`ChainResolver()`

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`.
`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 ##)
`java.util.List` | `getResolvers()`
`boolean` | `isDual()`
`boolean` | `isReturnFirst()`
`java.util.Map[]` | `listTokenValues(java.lang.String[] tokens, java.util.Map criteria)` Same as `DependencyResolver.listTokenValues(String, Map)` but more generic.
`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` | `setDual(boolean b)`
`void` | `setReturnFirst(boolean returnFirst)`

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, 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`

Constructor Detail

### ChainResolver

    public ChainResolver()

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`

### listTokenValues

    public java.util.Map[] listTokenValues(java.lang.String[] tokens,
                                           java.util.Map criteria)

  Description copied from interface: `DependencyResolver`
  Same as `DependencyResolver.listTokenValues(String, Map)` but more generic.

  Specified by:
    `listTokenValues` in interface `DependencyResolver`
  Overrides:
    `listTokenValues` in class `AbstractResolver`
  Parameters:
    `tokens` - the tokens of the query
    `criteria` - the token which have values
  Returns:
    the list of token values (Map[]), must not be `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.

### getResolvers

    public java.util.List getResolvers()

### 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`

### isReturnFirst

    public boolean isReturnFirst()

### setReturnFirst

    public void setReturnFirst(boolean returnFirst)

### 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`.

### setDual

    public void setDual(boolean b)

### isDual

    public boolean isDual()

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