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OperationImpl.java
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OperationImpl.java
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/*
* 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;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.lang.reflect.Field;
import java.util.List;
import javax.annotation.concurrent.Immutable;
import com.google.common.collect.ImmutableList;
/**
* OperationImpl is the default implementation of the Operation interface
*
* @author tiwe
*
* @param <T> expression type
*/
@Immutable
public class OperationImpl<T> extends ExpressionBase<T> implements Operation<T> {
private static final long serialVersionUID = 4796432056083507588L;
private final ImmutableList<Expression<?>> args;
private final Operator<? super T> operator;
public static <RT> Operation<RT> create(Class<? extends RT> type, Operator<? super RT> operator, Expression<?> one) {
return new OperationImpl<RT>(type, operator, ImmutableList.<Expression<?>>of(one));
}
public static <RT> Operation<RT> create(Class<? extends RT> type, Operator<? super RT> operator, Expression<?> one, Expression<?> two) {
return new OperationImpl<RT>(type, operator, ImmutableList.of(one, two));
}
protected OperationImpl(Class<? extends T> type, Operator<? super T> operator, Expression<?>... args) {
this(type, operator, ImmutableList.copyOf(args));
}
public OperationImpl(Class<? extends T> type, Operator<? super T> operator, ImmutableList<Expression<?>> args) {
super(type);
this.operator = operator;
this.args = args;
}
@Override
public final Expression<?> getArg(int i) {
return args.get(i);
}
@Override
public final List<Expression<?>> getArgs() {
return args;
}
@Override
public final Operator<? super T> getOperator() {
return operator;
}
@Override
public final boolean equals(Object o) {
if (o == this) {
return true;
} else if (o instanceof Operation<?>) {
Operation<?> op = (Operation<?>)o;
return op.getOperator() == operator
&& op.getArgs().equals(args)
&& op.getType().equals(getType());
} else {
return false;
}
}
@Override
public final <R, C> R accept(Visitor<R, C> v, C context) {
return v.visit(this, context);
}
/**
* Resets operator field to singleton version
*
* @param ois
* @throws ClassNotFoundException
* @throws IOException
*/
private void readObject(ObjectInputStream ois) throws ClassNotFoundException, IOException {
try {
ois.defaultReadObject();
Field field = OperationImpl.class.getDeclaredField("operator");
field.setAccessible(true);
field.set(this, OperatorImpl.OPS.get(operator.getId()));
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}