Add enum to Java docs

* Parameter enum values
* Inner enum class (model property)
* Outer enum class (enum model/definition)

samples/client/petstore/java/okhttp-gson/src/main/java/io/swagger/client/model/Animal.java

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+package io.swagger.client.model;
+
+import java.util.Objects;
+import io.swagger.annotations.ApiModel;
+import io.swagger.annotations.ApiModelProperty;
+
+import com.google.gson.annotations.SerializedName;
+
+
+
+
+
+public class Animal   {
+  
+  @SerializedName("className")
+  private String className = null;
+  
+
+  
+  /**
+   **/
+  @ApiModelProperty(required = true, value = "")
+  public String getClassName() {
+    return className;
+  }
+  public void setClassName(String className) {
+    this.className = className;
+  }
+
+  
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) {
+      return true;
+    }
+    if (o == null || getClass() != o.getClass()) {
+      return false;
+    }
+    Animal animal = (Animal) o;
+    return Objects.equals(this.className, animal.className);
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(className);
+  }
+
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder();
+    sb.append("class Animal {\n");
+    
+    sb.append("    className: ").append(toIndentedString(className)).append("\n");
+    sb.append("}");
+    return sb.toString();
+  }
+
+  /**
+   * Convert the given object to string with each line indented by 4 spaces
+   * (except the first line).
+   */
+  private String toIndentedString(Object o) {
+    if (o == null) {
+      return "null";
+    }
+    return o.toString().replace("\n", "\n    ");
+  }
+}

samples/client/petstore/java/okhttp-gson/src/main/java/io/swagger/client/model/Cat.java

@@ -0,0 +1,87 @@
+package io.swagger.client.model;
+
+import java.util.Objects;
+import io.swagger.annotations.ApiModel;
+import io.swagger.annotations.ApiModelProperty;
+import io.swagger.client.model.Animal;
+
+import com.google.gson.annotations.SerializedName;
+
+
+
+
+
+public class Cat extends Animal  {
+  
+  @SerializedName("className")
+  private String className = null;
+  
+  @SerializedName("declawed")
+  private Boolean declawed = null;
+  
+
+  
+  /**
+   **/
+  @ApiModelProperty(required = true, value = "")
+  public String getClassName() {
+    return className;
+  }
+  public void setClassName(String className) {
+    this.className = className;
+  }
+
+  
+  /**
+   **/
+  @ApiModelProperty(value = "")
+  public Boolean getDeclawed() {
+    return declawed;
+  }
+  public void setDeclawed(Boolean declawed) {
+    this.declawed = declawed;
+  }
+
+  
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) {
+      return true;
+    }
+    if (o == null || getClass() != o.getClass()) {
+      return false;
+    }
+    Cat cat = (Cat) o;
+    return Objects.equals(this.className, cat.className) &&
+        Objects.equals(this.declawed, cat.declawed) &&
+        super.equals(o);
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(className, declawed, super.hashCode());
+  }
+
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder();
+    sb.append("class Cat {\n");
+    sb.append("    ").append(toIndentedString(super.toString())).append("\n");
+    sb.append("    className: ").append(toIndentedString(className)).append("\n");
+    sb.append("    declawed: ").append(toIndentedString(declawed)).append("\n");
+    sb.append("}");
+    return sb.toString();
+  }
+
+  /**
+   * Convert the given object to string with each line indented by 4 spaces
+   * (except the first line).
+   */
+  private String toIndentedString(Object o) {
+    if (o == null) {
+      return "null";
+    }
+    return o.toString().replace("\n", "\n    ");
+  }
+}

samples/client/petstore/java/okhttp-gson/src/main/java/io/swagger/client/model/Dog.java

@@ -0,0 +1,87 @@
+package io.swagger.client.model;
+
+import java.util.Objects;
+import io.swagger.annotations.ApiModel;
+import io.swagger.annotations.ApiModelProperty;
+import io.swagger.client.model.Animal;
+
+import com.google.gson.annotations.SerializedName;
+
+
+
+
+
+public class Dog extends Animal  {
+  
+  @SerializedName("className")
+  private String className = null;
+  
+  @SerializedName("breed")
+  private String breed = null;
+  
+
+  
+  /**
+   **/
+  @ApiModelProperty(required = true, value = "")
+  public String getClassName() {
+    return className;
+  }
+  public void setClassName(String className) {
+    this.className = className;
+  }
+
+  
+  /**
+   **/
+  @ApiModelProperty(value = "")
+  public String getBreed() {
+    return breed;
+  }
+  public void setBreed(String breed) {
+    this.breed = breed;
+  }
+
+  
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) {
+      return true;
+    }
+    if (o == null || getClass() != o.getClass()) {
+      return false;
+    }
+    Dog dog = (Dog) o;
+    return Objects.equals(this.className, dog.className) &&
+        Objects.equals(this.breed, dog.breed) &&
+        super.equals(o);
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(className, breed, super.hashCode());
+  }
+
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder();
+    sb.append("class Dog {\n");
+    sb.append("    ").append(toIndentedString(super.toString())).append("\n");
+    sb.append("    className: ").append(toIndentedString(className)).append("\n");
+    sb.append("    breed: ").append(toIndentedString(breed)).append("\n");
+    sb.append("}");
+    return sb.toString();
+  }
+
+  /**
+   * Convert the given object to string with each line indented by 4 spaces
+   * (except the first line).
+   */
+  private String toIndentedString(Object o) {
+    if (o == null) {
+      return "null";
+    }
+    return o.toString().replace("\n", "\n    ");
+  }
+}