org.eclipse.jdt.internal.compiler.lookup.Substitution.java Source code

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Here is the source code for org.eclipse.jdt.internal.compiler.lookup.Substitution.java

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/*******************************************************************************
 * Copyright (c) 2000, 2018 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.compiler.lookup;

/*
 * Encapsulates aspects related to type variable substitution
 */
public interface Substitution {

    /**
     * Don't substitute any type variables.
     * Enables the use of {@link Scope.Substitutor} for other purposes.
     */
    public static class NullSubstitution implements Substitution {
        LookupEnvironment environment;

        public NullSubstitution(LookupEnvironment environment) {
            this.environment = environment;
        }

        @Override
        public TypeBinding substitute(TypeVariableBinding typeVariable) {
            return typeVariable;
        }

        @Override
        public boolean isRawSubstitution() {
            return false;
        }

        @Override
        public LookupEnvironment environment() {
            return this.environment;
        }
    }

    /**
     * Returns the type substitute for a given type variable, or itself
     * if no substitution got performed.
     */
    TypeBinding substitute(TypeVariableBinding typeVariable);

    /**
     * Returns the lookup environment
     */
    LookupEnvironment environment();

    /**
     * Returns true for raw substitution
     */
    boolean isRawSubstitution();
}