com.avaje.ebeaninternal.server.expression.IdExpression Maven / Gradle / Ivy
package com.avaje.ebeaninternal.server.expression;
import com.avaje.ebeaninternal.api.HashQueryPlanBuilder;
import com.avaje.ebeaninternal.api.ManyWhereJoins;
import com.avaje.ebeaninternal.api.SpiExpression;
import com.avaje.ebeaninternal.api.SpiExpressionRequest;
import com.avaje.ebeaninternal.api.SpiExpressionValidation;
import com.avaje.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 (int i = 0; i < bindIdValues.length; i++) {
request.addBindValue(bindIdValues[i]);
}
}
@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);
}
}