Added the SelectionQuery to create a 'select'-statement

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

@@ -0,0 +1,84 @@
+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 SelectionQuery extends AbstractQuery {
+
+    @Override
+    public void defaults() {
+
+        ArrayList<String> selectList = new ArrayList<>();
+        selectList.add("*");
+
+        addParameter(SELECT_LIST, selectList);
+        addParameter(WHERE_LIST, new HashMap<Object, String>());
+        addParameter(TABLE_NAME, "default");
+    }
+
+    /**
+     * Builds the selection list
+     *
+     * @return the list as a string
+     */
+    public String buildSelectionList() {
+        StringBuilder selectionString = new StringBuilder();
+
+        for (String selectItem : ((ArrayList<String>) getParameter(SELECT_LIST))) {
+            if (!selectionString.toString().isEmpty()) selectionString.append(", ");
+            selectionString.append(selectItem);
+        }
+
+        return selectionString.toString();
+    }
+
+    /**
+     * Builds the 'where'-list
+     *
+     * @return the 'where'-list as a string
+     */
+    public String buildWhereList() {
+        StatementBuilder whereString = new StatementBuilder();
+
+        HashMap<String, Object> whereList = (HashMap<String, Object>) getParameter(WHERE_LIST);
+
+        for (int i = 0; i < whereList.size(); i++) {
+            if (i == 0) whereString.append("WHERE");
+            else whereString.append("AND");
+
+            whereString.append("`"+whereList.keySet().toArray()[i]+"`").append("=").append("?");
+        }
+
+        return whereString.toString();
+    }
+
+    /**
+     * Gets the parameters
+     * @return the parameters
+     */
+    public Object[] getParameters() {
+
+        HashMap<String, Object> whereList = (HashMap<String, Object>) getParameter(WHERE_LIST);
+
+        return whereList.values().toArray();
+    }
+
+    @Override
+    public SQLQuery build() {
+
+        StatementBuilder builder = new StatementBuilder("SELECT").append(buildSelectionList()).append("FROM").append("`" + getParameter(TABLE_NAME) + "`");
+
+        builder.append(buildWhereList());
+
+        if (getParameter(LIMIT) != null) builder.append("LIMIT").append(getParameter(LIMIT).toString());
+
+        return new SQLQuery().setStatement(builder.build()).setParameters(getParameters());
+    }
+
+}