#919 - io.ebean package initial

src/main/java/io/ebeaninternal/server/expression/ArrayIsEmptyExpression.java

@@ -0,0 +1,59 @@
+package io.ebeaninternal.server.expression;
+
+import io.ebeaninternal.api.HashQueryPlanBuilder;
+import io.ebeaninternal.api.SpiExpression;
+import io.ebeaninternal.api.SpiExpressionRequest;
+
+import java.io.IOException;
+
+/**
+ * IsEmpty expression for ARRAY type.
+ */
+public class ArrayIsEmptyExpression extends AbstractExpression {
+
+  private final boolean empty;
+
+  protected ArrayIsEmptyExpression(String propName, boolean empty) {
+    super(propName);
+    this.empty = empty;
+  }
+
+  @Override
+  public void writeDocQuery(DocQueryContext context) throws IOException {
+    context.writeExists(!empty, propName);
+  }
+
+  @Override
+  public void queryPlanHash(HashQueryPlanBuilder builder) {
+    builder.add(ArrayIsEmptyExpression.class).add(propName);
+  }
+
+  @Override
+  public int queryBindHash() {
+    return empty ? 0 : 92821;
+  }
+
+  @Override
+  public boolean isSameByPlan(SpiExpression other) {
+    if (!(other instanceof ArrayIsEmptyExpression)) {
+      return false;
+    }
+    ArrayIsEmptyExpression that = (ArrayIsEmptyExpression) other;
+    return this.propName.equals(that.propName) && this.empty == that.empty;
+  }
+
+  @Override
+  public boolean isSameByBind(SpiExpression other) {
+    return true;
+  }
+
+  @Override
+  public void addSql(SpiExpressionRequest request) {
+    request.getDbPlatformHandler().arrayIsEmpty(request, propName, empty);
+  }
+
+  @Override
+  public void addBindValues(SpiExpressionRequest request) {
+    // nothing to bind
+  }
+}