com.opengamma.engine.function.NoOpFunction.java Source code

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Here is the source code for com.opengamma.engine.function.NoOpFunction.java

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/**
 * Copyright (C) 2012 - present by OpenGamma Inc. and the OpenGamma group of companies
 * 
 * Please see distribution for license.
 */
package com.opengamma.engine.function;

import java.util.Set;

import com.google.common.collect.Sets;
import com.opengamma.engine.ComputationTarget;
import com.opengamma.engine.cache.MissingOutput;
import com.opengamma.engine.value.ComputedValue;
import com.opengamma.engine.value.ValueRequirement;
import com.opengamma.engine.value.ValueSpecification;

/**
 * A no-op function. This will never be selected during graph construction, but can be present in an execution plan as a placeholder for a suppressed function.
 * <p>
 * This should be present in all function repositories with its preferred identifier.
 */
public final class NoOpFunction extends IntrinsicFunction {

    /**
     * Shared instance.
     */
    public static final NoOpFunction INSTANCE = new NoOpFunction();

    /**
     * Preferred identifier this function will be available in a repository as.
     */
    public static final String UNIQUE_ID = "No-op";

    public NoOpFunction() {
        super(UNIQUE_ID);
    }

    // FunctionInvoker

    @Override
    public Set<ComputedValue> execute(final FunctionExecutionContext executionContext, final FunctionInputs inputs,
            final ComputationTarget target, final Set<ValueRequirement> desiredValues) {
        final Set<ComputedValue> result = Sets.newHashSetWithExpectedSize(desiredValues.size());
        for (ValueRequirement desiredValue : desiredValues) {
            result.add(new ComputedValue(new ValueSpecification(desiredValue.getValueName(),
                    target.toSpecification(), desiredValue.getConstraints()), MissingOutput.SUPPRESSED));
        }
        return result;
    }

}