機會生成器

if (resource.metadata != null) {
 // push in the CustomRangeResolver before other resolvers
    if (resource.metadata.containsKey(DefaultMetadataKeys.CUSTOM_DELETE_RANGES_METADATA_KEY)
        result.push(new CustomRangeResolver());
    else if (resource.metadata.containsKey(DefaultMetadataKeys.CUSTOM_REPLACE_RANGES_METADATA_KEY))
        result.push(new CustomRangeResolver());
    if (resource.metadata.containsKey(DefaultMetadataKeys.CUSTOM_AD_MARKERS_METADATA_KEY)) {
        result.push(new CustomAdResolver());    // no ad insertion with mark ranges
    }
    else if (resource.metadata.containsKey(DefaultMetadataKeys.AUDITUDE_METADATA_KEY)) {
        if (_auditudeResolver == null) {
              _auditudeResolver = new AuditudeResolver();
        }
        result.push(_auditudeResolver);
    }
    else if (resource.metadata.containsKey(DefaultMetadataKeys.JSON_METADATA_KEY)) {
        result.push(new MetadataResolver());
    }
}

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