/*
* Copyright 2011, Mysema Ltd
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.mysema.query.types.path;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.Collection;
import javax.annotation.Nullable;
import com.mysema.query.types.ExpressionException;
import com.mysema.query.types.Path;
import com.mysema.query.types.PathImpl;
import com.mysema.query.types.PathMetadata;
import com.mysema.query.types.expr.CollectionExpressionBase;
import com.mysema.query.types.expr.SimpleExpression;
/**
* CollectionPath is a base class for collection typed paths
*
* @author tiwe
*
* @param <E> component type
* @param <Q> component query type
*/
public abstract class CollectionPathBase<C extends Collection<E>, E, Q extends SimpleExpression<? super E>>
extends CollectionExpressionBase<C, E> implements Path<C> {
private static final long serialVersionUID = -9004995667633601298L;
@Nullable
private transient volatile Constructor<?> constructor;
private volatile boolean usePathInits = false;
private final PathInits inits;
public CollectionPathBase(PathImpl<C> mixin, PathInits inits) {
super(mixin);
this.inits = inits;
}
public abstract Q any();
@SuppressWarnings("unchecked")
protected Q newInstance(Class<Q> queryType, PathMetadata<?> pm) {
try{
if (constructor == null) {
if (Constants.isTyped(queryType)) {
try {
constructor = queryType.getConstructor(Class.class, PathMetadata.class, PathInits.class);
usePathInits = true;
} catch (NoSuchMethodException e) {
constructor = queryType.getConstructor(Class.class, PathMetadata.class);
}
} else {
try {
constructor = queryType.getConstructor(PathMetadata.class, PathInits.class);
usePathInits = true;
} catch (NoSuchMethodException e) {
constructor = queryType.getConstructor(PathMetadata.class);
}
}
}
if (Constants.isTyped(queryType)) {
if (usePathInits) {
return (Q)constructor.newInstance(getElementType(), pm, inits);
} else {
return (Q)constructor.newInstance(getElementType(), pm);
}
} else {
if (usePathInits) {
return (Q)constructor.newInstance(pm, inits);
} else {
return (Q)constructor.newInstance(pm);
}
}
} catch (NoSuchMethodException e) {
throw new ExpressionException(e);
} catch (InstantiationException e) {
throw new ExpressionException(e);
} catch (IllegalAccessException e) {
throw new ExpressionException(e);
} catch (InvocationTargetException e) {
throw new ExpressionException(e);
}
}
}