// $Id: ConstructorNode.java 7460 2005-07-12 20:27:29Z steveebersole $
package org.hibernate.hql.ast.tree;
import java.lang.reflect.Constructor;
import java.util.Arrays;
import java.util.List;
import org.hibernate.PropertyNotFoundException;
import org.hibernate.hql.ast.DetailedSemanticException;
import org.hibernate.type.Type;
import org.hibernate.util.ReflectHelper;
import org.hibernate.util.StringHelper;
import antlr.SemanticException;
import antlr.collections.AST;
/**
* Represents a constructor (new) in a SELECT.
*
* @author josh Sep 24, 2004 6:46:08 PM
*/
public class ConstructorNode extends SelectExpressionList implements SelectExpression {
private Constructor constructor;
private Type[] constructorArgumentTypes;
private boolean isMap;
private boolean isList;
public boolean isMap() {
return isMap;
}
public boolean isList() {
return isList;
}
public String[] getAliases() {
SelectExpression[] selectExpressions = collectSelectExpressions();
String[] aliases = new String[selectExpressions.length] ;
for ( int i=0; i<selectExpressions.length; i++ ) {
String alias = selectExpressions[i].getAlias();
aliases[i] = alias==null ? Integer.toString(i) : alias;
}
return aliases;
}
public void setScalarColumnText(int i) throws SemanticException {
SelectExpression[] selectExpressions = collectSelectExpressions();
// Invoke setScalarColumnText on each constructor argument.
for ( int j = 0; j < selectExpressions.length; j++ ) {
SelectExpression selectExpression = selectExpressions[j];
selectExpression.setScalarColumnText( j );
}
}
protected AST getFirstSelectExpression() {
// Collect the select expressions, skip the first child because it is the class name.
return getFirstChild().getNextSibling();
}
/**
* @deprecated (tell clover to ignore this method)
*/
public Type getDataType() {
/*
// Return the type of the object created by the constructor.
AST firstChild = getFirstChild();
String text = firstChild.getText();
if ( firstChild.getType() == SqlTokenTypes.DOT ) {
DotNode dot = ( DotNode ) firstChild;
text = dot.getPath();
}
return getSessionFactoryHelper().requireEntityType( text );
*/
throw new UnsupportedOperationException( "getDataType() is not supported by ConstructorNode!" );
}
public void prepare() throws SemanticException {
constructorArgumentTypes = resolveConstructorArgumentTypes();
String path = ( ( PathNode ) getFirstChild() ).getPath();
if ( "map".equals( path.toLowerCase() ) ) {
isMap = true;
}
else if ( "list".equals( path.toLowerCase() ) ) {
isList = true;
}
else {
constructor = resolveConstructor(path);
}
}
private Type[] resolveConstructorArgumentTypes() throws SemanticException {
SelectExpression[] argumentExpressions = collectSelectExpressions();
if ( argumentExpressions == null ) {
// return an empty Type array
return new Type[]{};
}
Type[] types = new Type[argumentExpressions.length];
for ( int x = 0; x < argumentExpressions.length; x++ ) {
types[x] = argumentExpressions[x].getDataType();
}
return types;
}
private Constructor resolveConstructor(String path) throws SemanticException {
String importedClassName = getSessionFactoryHelper().getImportedClassName( path );
String className = StringHelper.isEmpty( importedClassName ) ? path : importedClassName;
if ( className == null ) {
throw new SemanticException( "Unable to locate class [" + path + "]" );
}
try {
Class holderClass = ReflectHelper.classForName( className );
return ReflectHelper.getConstructor( holderClass, constructorArgumentTypes );
}
catch ( ClassNotFoundException e ) {
throw new DetailedSemanticException( "Unable to locate class [" + className + "]", e );
}
catch ( PropertyNotFoundException e ) {
// this is the exception returned by ReflectHelper.getConstructor() if it cannot
// locate an appropriate constructor
throw new DetailedSemanticException( "Unable to locate appropriate constructor on class [" + className + "]", e );
}
}
public Constructor getConstructor() {
return constructor;
}
public List getConstructorArgumentTypeList() {
return Arrays.asList( constructorArgumentTypes );
}
public FromElement getFromElement() {
return null;
}
public boolean isConstructor() {
return true;
}
public boolean isReturnableEntity() throws SemanticException {
return false;
}
public boolean isScalar() {
// Constructors are always considered scalar results.
return true;
}
public void setAlias(String alias) {
throw new UnsupportedOperationException("constructor may not be aliased");
}
public String getAlias() {
throw new UnsupportedOperationException("constructor may not be aliased");
}
}