#919 - io.ebean package initial

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

@@ -0,0 +1,91 @@
+package io.ebeaninternal.server.expression;
+
+import io.ebeaninternal.api.HashQueryPlanBuilder;
+import io.ebeaninternal.api.ManyWhereJoins;
+import io.ebeaninternal.api.SpiExpression;
+import io.ebeaninternal.api.SpiExpressionRequest;
+import io.ebeaninternal.api.SpiExpressionValidation;
+import io.ebeaninternal.server.deploy.BeanDescriptor;
+
+import java.io.IOException;
+
+/**
+ * Slightly redundant as Query.setId() ultimately also does the same job.
+ */
+class IdExpression extends NonPrepareExpression implements SpiExpression {
+
+  private final Object value;
+
+  IdExpression(Object value) {
+    this.value = value;
+  }
+
+  @Override
+  public void writeDocQuery(DocQueryContext context) throws IOException {
+    context.writeId(value);
+  }
+
+  @Override
+  public String nestedPath(BeanDescriptor<?> desc) {
+    return null;
+  }
+
+  /**
+   * Always returns false.
+   */
+  @Override
+  public void containsMany(BeanDescriptor<?> desc, ManyWhereJoins manyWhereJoin) {
+
+  }
+
+  @Override
+  public void validate(SpiExpressionValidation validation) {
+    // always valid
+  }
+
+  @Override
+  public void addBindValues(SpiExpressionRequest request) {
+
+    // 'flatten' EmbeddedId and multiple Id cases
+    // into an array of the underlying scalar field values
+    DefaultExpressionRequest r = (DefaultExpressionRequest) request;
+    Object[] bindIdValues = r.getBeanDescriptor().getBindIdValues(value);
+    for (Object bindIdValue : bindIdValues) {
+      request.addBindValue(bindIdValue);
+    }
+  }
+
+  @Override
+  public void addSql(SpiExpressionRequest request) {
+
+    DefaultExpressionRequest r = (DefaultExpressionRequest) request;
+    String idSql = r.getBeanDescriptor().getIdBinderIdSql();
+
+    request.append(idSql).append(" ");
+  }
+
+  /**
+   * No properties so this is just a unique static number.
+   */
+  @Override
+  public void queryPlanHash(HashQueryPlanBuilder builder) {
+    builder.add(IdExpression.class);
+    builder.bind(1);
+  }
+
+  @Override
+  public int queryBindHash() {
+    return value.hashCode();
+  }
+
+  @Override
+  public boolean isSameByPlan(SpiExpression other) {
+    return other instanceof IdExpression;
+  }
+
+  @Override
+  public boolean isSameByBind(SpiExpression other) {
+    IdExpression that = (IdExpression) other;
+    return value.equals(that.value);
+  }
+}