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/*******************************************************************************
* Copyright (c) 2013 GK Software AG.
*
* 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:
* Stephan Herrmann - initial API and implementation
*******************************************************************************/
package org.eclipse.jdt.internal.compiler.lookup;
/**
* Generalization over TypeBounds and ConstraintFormulas which both
* can be created during reduction.
*/
public abstract class ReductionResult {
protected static final ConstraintTypeFormula TRUE = new ConstraintTypeFormula() {
/* empty body just to make abstract class instantiable */
@Override
public Object reduce(InferenceContext18 context) { return this; }
@Override
public String toString() { return "TRUE"; } //$NON-NLS-1$
};
protected static final ConstraintTypeFormula FALSE = new ConstraintTypeFormula() {
/* empty body just to make abstract class instantiable */
@Override
public Object reduce(InferenceContext18 context) { return this; }
@Override
public String toString() { return "FALSE"; } //$NON-NLS-1$
};
// Relation kinds, mimic an enum:
protected static final int COMPATIBLE = 1;
protected static final int SUBTYPE = 2;
protected static final int SUPERTYPE = 3;
protected static final int SAME = 4;
protected static final int TYPE_ARGUMENT_CONTAINED = 5;
protected static final int CAPTURE = 6;
static final int EXCEPTIONS_CONTAINED = 7;
protected static final int POTENTIALLY_COMPATIBLE = 8;
protected TypeBinding right; // note that the LHS differs between sub-classes.
protected int relation;
protected static String relationToString(int relation) {
switch (relation) {
case SAME: return " = "; //$NON-NLS-1$
case COMPATIBLE: return " \u2192 "; //$NON-NLS-1$
case POTENTIALLY_COMPATIBLE: return " \u2192? "; //$NON-NLS-1$
case SUBTYPE: return " <: "; //$NON-NLS-1$
case SUPERTYPE: return " :> "; //$NON-NLS-1$
case TYPE_ARGUMENT_CONTAINED:
return " <= "; //$NON-NLS-1$
case CAPTURE:
return " captureOf "; //$NON-NLS-1$
default:
throw new IllegalArgumentException("Unknown type relation "+relation); //$NON-NLS-1$
}
}
}
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