added option to ignore import mappings in model generation.

modules/swagger-codegen-cli/src/main/java/io/swagger/codegen/cmd/Generate.java

@@ -175,6 +175,9 @@ public class Generate implements Runnable {
     @Option(name = {"--skip-alias-generation"}, title = "skip alias generation.", description = "skip code generation for models identified as alias.")
     private Boolean skipAliasGeneration;
 
+    @Option(name = {"--ignore-import-mapping"}, title = "ignore import mapping", description = "allow generate model classes using names previously listed on import mappings.")
+    private String ignoreImportMappings;
+
     @Override
     public void run() {
 
@@ -280,6 +283,10 @@ public void run() {
             configurator.setSkipAliasGeneration(removeOperationIdPrefix);
         }
 
+        if (ignoreImportMappings != null) {
+            additionalProperties.add(String.format("%s=%s", CodegenConstants.IGNORE_IMPORT_MAPPING_OPTION, Boolean.parseBoolean(ignoreImportMappings)));
+        }
+
         applySystemPropertiesKvpList(systemProperties, configurator);
         applyInstantiationTypesKvpList(instantiationTypes, configurator);
         applyImportMappingsKvpList(importMappings, configurator);

modules/swagger-codegen/src/main/java/io/swagger/codegen/CodegenConfig.java

@@ -226,4 +226,10 @@ public interface CodegenConfig {
 
     Boolean getSkipAliasGeneration();
 
+    boolean getIgnoreImportMapping();
+
+    void setIgnoreImportMapping(boolean ignoreImportMapping);
+
+    boolean defaultIgnoreImportMappingOption();
+
 }

modules/swagger-codegen/src/main/java/io/swagger/codegen/CodegenConstants.java

@@ -234,4 +234,6 @@ public static enum ENUM_PROPERTY_NAMING_TYPE {camelCase, PascalCase, snake_case,
     public static final String ASP_NET_CORE_VERSION = "aspnetCoreVersion";
     public static final String INTERFACE_ONLY = "interface-only";
     public static final String INTERFACE_CONTROLLER = "interface-controller";
+
+    public static final String IGNORE_IMPORT_MAPPING_OPTION = "ignoreImportMappings";
 }

modules/swagger-codegen/src/main/java/io/swagger/codegen/DefaultCodegen.java

@@ -104,6 +104,7 @@ public class DefaultCodegen {
     protected String httpUserAgent;
     protected Boolean hideGenerationTimestamp = true;
     protected Boolean skipAliasGeneration;
+    protected boolean ignoreImportMapping;
     // How to encode special characters like $
     // They are translated to words like "Dollar" and prefixed with '
     // Then translated back during JSON encoding and decoding
@@ -163,6 +164,12 @@ public void processOpts() {
             this.setRemoveOperationIdPrefix(Boolean.valueOf(additionalProperties
                     .get(CodegenConstants.REMOVE_OPERATION_ID_PREFIX).toString()));
         }
+
+        if (additionalProperties.get(CodegenConstants.IGNORE_IMPORT_MAPPING_OPTION) != null) {
+            setIgnoreImportMapping(Boolean.parseBoolean( additionalProperties.get(CodegenConstants.IGNORE_IMPORT_MAPPING_OPTION).toString()));
+        } else {
+            setIgnoreImportMapping(defaultIgnoreImportMappingOption());
+        }
     }
 
     // override with any special post-processing for all models
@@ -3958,4 +3965,16 @@ protected void configureDataForTestTemplate(CodegenOperation codegenOperation) {
         }
         codegenOperation.testPath = path;
     }
+
+    public boolean getIgnoreImportMapping() {
+        return ignoreImportMapping;
+    }
+
+    public void setIgnoreImportMapping(boolean ignoreImportMapping) {
+        this.ignoreImportMapping = ignoreImportMapping;
+    }
+
+    public boolean defaultIgnoreImportMappingOption() {
+        return false;
+    }
 }

modules/swagger-codegen/src/main/java/io/swagger/codegen/DefaultGenerator.java

@@ -378,7 +378,7 @@ private Model getParent(Model model) {
         for (String name : modelKeys) {
             try {
                 //don't generate models that have an import mapping
-                if (config.importMapping().containsKey(name)) {
+                if (!config.getIgnoreImportMapping() && config.importMapping().containsKey(name)) {
                     LOGGER.info("Model " + name + " not imported due to import mapping");
                     continue;
                 }
@@ -409,7 +409,7 @@ private Model getParent(Model model) {
             models.put("modelPackage", config.modelPackage());
             try {
                 //don't generate models that have an import mapping
-                if (config.importMapping().containsKey(modelName)) {
+                if (!config.getIgnoreImportMapping() && config.importMapping().containsKey(modelName)) {
                     continue;
                 }
                 Map<String, Object> modelTemplate = (Map<String, Object>) ((List<Object>) models.get("models")).get(0);

modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/AbstractJavaCodegen.java

@@ -603,7 +603,7 @@ public String toParamName(String name) {
     public String toModelName(final String name) {
         // We need to check if import-mapping has a different model for this class, so we use it
         // instead of the auto-generated one.
-        if (importMapping.containsKey(name)) {
+        if (!getIgnoreImportMapping() && importMapping.containsKey(name)) {
             return importMapping.get(name);
         }
 
@@ -1349,4 +1349,8 @@ public String sanitizeTag(String tag) {
         return tag;
     }
 
+    public boolean defaultIgnoreImportMappingOption() {
+        return true;
+    }
+
 }