Added the UpdateQuery

src/main/java/de/gnmyt/sqltoolkit/queries/UpdateQuery.java

@@ -0,0 +1,82 @@
+package de.gnmyt.sqltoolkit.queries;
+
+import de.gnmyt.sqltoolkit.querybuilder.AbstractQuery;
+import de.gnmyt.sqltoolkit.querybuilder.SQLQuery;
+import de.gnmyt.sqltoolkit.querybuilder.StatementBuilder;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+
+import static de.gnmyt.sqltoolkit.querybuilder.QueryParameter.*;
+
+public class UpdateQuery extends AbstractQuery {
+
+    @Override
+    public void defaults() {
+        addParameter(TABLE_NAME, "default");
+        addParameter(WHERE_LIST, new HashMap<String, Object>());
+        addParameter(SET_LIST, new HashMap<String, Object>());
+    }
+
+    /**
+     * Builds the 'set'-list
+     *
+     * @return the 'set'-list as a string
+     */
+    public String buildSetList() {
+        StatementBuilder builder = new StatementBuilder("SET");
+
+        HashMap<String, Object> setList = (HashMap<String, Object>) getParameter(SET_LIST);
+
+        for (int i = 0; i < setList.size(); i++) {
+            if (i > 0) builder.appendDefault(",");
+            builder.append(setList.keySet().toArray()[i].toString()).append("=").append("?");
+        }
+
+        return builder.build();
+    }
+
+    /**
+     * Builds the 'where'-list
+     *
+     * @return the 'where'-list as a string
+     */
+    public String buildWhereList() {
+        StatementBuilder builder = new StatementBuilder("WHERE");
+
+        HashMap<String, Object> whereList = (HashMap<String, Object>) getParameter(WHERE_LIST);
+
+        for (int i = 0; i < whereList.size(); i++) {
+            if (i > 0) builder.append("AND");
+            builder.append(whereList.keySet().toArray()[i].toString()).append("=").append("?");
+        }
+
+        return builder.build();
+    }
+
+    /**
+     * Gets the parameters
+     *
+     * @return the parameters
+     */
+    public Object[] getParameters() {
+
+        ArrayList<Object> tempParameters = new ArrayList<>();
+
+        ((HashMap<String, Object>) getParameter(SET_LIST)).forEach((str, obj) -> tempParameters.add(obj));
+        ((HashMap<String, Object>) getParameter(WHERE_LIST)).forEach((str, obj) -> tempParameters.add(obj));
+
+        return tempParameters.toArray();
+    }
+
+    @Override
+    public SQLQuery build() {
+        StatementBuilder builder = new StatementBuilder("UPDATE").append((String) getParameter(TABLE_NAME));
+
+        if (!((HashMap<String, Object>) getParameter(SET_LIST)).isEmpty()) builder.append(buildSetList());
+
+        if (!((HashMap<String, Object>) getParameter(WHERE_LIST)).isEmpty()) builder.append(buildWhereList());
+
+        return new SQLQuery().setStatement(builder.build()).setParameters(getParameters());
+    }
+}