added functionality to spoonacular lib to convert units

backend/src/main/spoonaccular/AmountConversion.java

@@ -0,0 +1,34 @@
+package spoonaccular;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import io.github.cdimascio.dotenv.Dotenv;
+import okhttp3.OkHttpClient;
+import okhttp3.Request;
+import okhttp3.Response;
+import spoonaccular.models.amount_conversion.ConvertedAmount;
+
+import java.io.IOException;
+
+public class AmountConversion {
+
+    private static final OkHttpClient client =  new OkHttpClient();
+    private static final Dotenv dotenv = Dotenv.configure().ignoreIfMissing().ignoreIfMalformed().load();
+
+    private AmountConversion(){
+    }
+
+    public static double convertAmount(String ingrdientName, Double sourceAmount, String sourceUnit, String targetUnit) throws IOException {
+        Request request = APIAuthentication.addAuthHeaders(
+                new Request.Builder()
+                        .url("https://" + dotenv.get("X-RapidAPI-Host") +
+                        "recipes/convert?ingredientName=" + ingrdientName +
+                        "&targetUnit=" + targetUnit +
+                        "&sourceUnit=" + sourceUnit +
+                        "&sourceAmount=" + sourceAmount)
+        ).build();
+        Response response = client.newCall(request).execute();
+        String responseString = response.body().string();
+        return new ObjectMapper().readValue(responseString, ConvertedAmount.class).getTargetAmount();
+    }
+
+}

backend/src/main/spoonaccular/models/amount_conversion/ConvertedAmount.java

@@ -0,0 +1,110 @@
+package spoonaccular.models.amount_conversion;
+
+import java.util.HashMap;
+import java.util.Map;
+import javax.annotation.Generated;
+import com.fasterxml.jackson.annotation.JsonAnyGetter;
+import com.fasterxml.jackson.annotation.JsonAnySetter;
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonPropertyOrder;
+
+@JsonInclude(JsonInclude.Include.NON_NULL)
+@JsonPropertyOrder({
+        "sourceAmount",
+        "sourceUnit",
+        "targetAmount",
+        "targetUnit",
+        "answer",
+        "type"
+})
+@Generated("jsonschema2pojo")
+public class ConvertedAmount {
+
+    @JsonProperty("sourceAmount")
+    private Double sourceAmount;
+    @JsonProperty("sourceUnit")
+    private String sourceUnit;
+    @JsonProperty("targetAmount")
+    private Double targetAmount;
+    @JsonProperty("targetUnit")
+    private String targetUnit;
+    @JsonProperty("answer")
+    private String answer;
+    @JsonProperty("type")
+    private String type;
+    @JsonIgnore
+    private Map<String, Object> additionalProperties = new HashMap<String, Object>();
+
+    @JsonProperty("sourceAmount")
+    public Double getSourceAmount() {
+        return sourceAmount;
+    }
+
+    @JsonProperty("sourceAmount")
+    public void setSourceAmount(Double sourceAmount) {
+        this.sourceAmount = sourceAmount;
+    }
+
+    @JsonProperty("sourceUnit")
+    public String getSourceUnit() {
+        return sourceUnit;
+    }
+
+    @JsonProperty("sourceUnit")
+    public void setSourceUnit(String sourceUnit) {
+        this.sourceUnit = sourceUnit;
+    }
+
+    @JsonProperty("targetAmount")
+    public Double getTargetAmount() {
+        return targetAmount;
+    }
+
+    @JsonProperty("targetAmount")
+    public void setTargetAmount(Double targetAmount) {
+        this.targetAmount = targetAmount;
+    }
+
+    @JsonProperty("targetUnit")
+    public String getTargetUnit() {
+        return targetUnit;
+    }
+
+    @JsonProperty("targetUnit")
+    public void setTargetUnit(String targetUnit) {
+        this.targetUnit = targetUnit;
+    }
+
+    @JsonProperty("answer")
+    public String getAnswer() {
+        return answer;
+    }
+
+    @JsonProperty("answer")
+    public void setAnswer(String answer) {
+        this.answer = answer;
+    }
+
+    @JsonProperty("type")
+    public String getType() {
+        return type;
+    }
+
+    @JsonProperty("type")
+    public void setType(String type) {
+        this.type = type;
+    }
+
+    @JsonAnyGetter
+    public Map<String, Object> getAdditionalProperties() {
+        return this.additionalProperties;
+    }
+
+    @JsonAnySetter
+    public void setAdditionalProperty(String name, Object value) {
+        this.additionalProperties.put(name, value);
+    }
+
+}