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agents-flex-store/agents-flex-store-pgvector/src/main/java/com/agentsflex/store/pgvector/PgvectorUtil.java

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+/*
+ *  Copyright (c) 2023-2025, Agents-Flex (fuhai999@gmail.com).
+ *  <p>
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *  <p>
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *  <p>
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package com.agentsflex.store.pgvector;
+
+import org.postgresql.util.PGobject;
+import java.sql.SQLException;
+
+public class PgvectorUtil {
+    /**
+     * 转化为vector.
+     * 如果需要half vector或者sparse vector 对应实现即可
+     * @param src 向量
+     * @return
+     * @throws SQLException
+     */
+    public static PGobject toPgVector(double[] src) throws SQLException {
+        PGobject vector = new PGobject();
+        vector.setType("vector");
+        if (src.length == 0) {
+            vector.setValue("[]");
+            return vector;
+        }
+
+        StringBuilder sb = new StringBuilder("[");
+        for (double v : src) {
+            sb.append(v);
+            sb.append(",");
+        }
+        vector.setValue(sb.substring(0, sb.length() - 1) + "]");
+
+        return vector;
+    }
+
+    public static double[] fromPgVector(String src) {
+        if (src.equals("[]")) {
+            return new double[0];
+        }
+
+        String[] strs = src.substring(1, src.length() - 1).split(",");
+        double[] output = new double[strs.length];
+        for (int i = 0; i < strs.length; i++) {
+            try {
+                output[i] = Double.parseDouble(strs[i]);
+            } catch (Exception ignore) {
+                output[i] = 0;
+            }
+        }
+        return output;
+    }
+}