/*
 * Copyright 2009-2010 by The Regents of the University of California
 * 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 from
 * 
 *     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 edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical;

import java.util.ArrayList;
import java.util.List;

import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
import edu.uci.ics.hyracks.algebricks.core.algebra.base.IPhysicalOperator;
import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment;
import edu.uci.ics.hyracks.algebricks.core.algebra.properties.VariablePropagationPolicy;
import edu.uci.ics.hyracks.algebricks.core.algebra.typing.ITypingContext;
import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionReferenceTransform;
import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;

/**
 * @author rico
 */
public class ExtensionOperator extends AbstractLogicalOperator {

    private IOperatorExtension delegate;

    public ExtensionOperator(IOperatorExtension delegate) {
        super();
        if (delegate == null) {
            throw new IllegalArgumentException("delegate cannot be null!");
        }
        this.delegate = delegate;
        setExecutionMode(delegate.getExecutionMode());
    }

    @Override
    public void recomputeSchema() throws AlgebricksException {
        schema = new ArrayList<LogicalVariable>(inputs.get(0).getValue().getSchema());
        delegate.setSchema(schema);
    }

    @Override
    public boolean acceptExpressionTransform(ILogicalExpressionReferenceTransform transform) throws AlgebricksException {
        return delegate.acceptExpressionTransform(transform);
    }

    @Override
    public <R, T> R accept(ILogicalOperatorVisitor<R, T> visitor, T arg) throws AlgebricksException {
        return visitor.visitExtensionOperator(this, arg);
    }

    @Override
    public boolean isMap() {
        return this.delegate.isMap();
    }

    @Override
    public VariablePropagationPolicy getVariablePropagationPolicy() {
        return VariablePropagationPolicy.ALL;
    }

    @Override
    public IVariableTypeEnvironment computeOutputTypeEnvironment(ITypingContext ctx) throws AlgebricksException {
        return this.createPropagatingAllInputsTypeEnvironment(ctx);
    }

    @Override
    public LogicalOperatorTag getOperatorTag() {
        return LogicalOperatorTag.EXTENSION_OPERATOR;
    }

    public IOperatorExtension getNewInstanceOfDelegateOperator() {
        return delegate.newInstance();
    }

    @Override
    public List<LogicalVariable> getSchema() {
        return this.schema;
    }

    @Override
    public ExecutionMode getExecutionMode() {
        return delegate.getExecutionMode();
    }

    @Override
    public void setExecutionMode(ExecutionMode mode) {
        delegate.setExecutionMode(mode);
    }

    @Override
    public IPhysicalOperator getPhysicalOperator() {
        return delegate.getPhysicalOperator();
    }

    @Override
    public IVariableTypeEnvironment computeInputTypeEnvironment(ITypingContext ctx) throws AlgebricksException {
        return this.createPropagatingAllInputsTypeEnvironment(ctx);
    }

    @Override
    public String toString() {
        return delegate.toString();
    }
    
    public IOperatorExtension getDelegate() {
        return delegate;
    }

}