org.eclipse.jdt.internal.compiler.ast.ExpressionContext.java Source code

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Here is the source code for org.eclipse.jdt.internal.compiler.ast.ExpressionContext.java

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/*******************************************************************************
 * Copyright (c) 2013, 2014 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
 *     Stephan Herrmann - Contribution for
 *                        Bug 427438 - [1.8][compiler] NPE at org.eclipse.jdt.internal.compiler.ast.ConditionalExpression.generateCode(ConditionalExpression.java:280)
 *******************************************************************************/
package org.eclipse.jdt.internal.compiler.ast;

public enum ExpressionContext {

    /** Assignment context: potential poly-expressions are: method invocations, lambdas, reference expressions, 
       conditional expressions and allocation expressions. This is the only Java 7 context where target type
       influenced evaluation of some expression.
           
       Context induced by: ReturnStatement, ArrayInitializer, Assignment, FieldDeclaration and LocalDeclaration. 
    */
    ASSIGNMENT_CONTEXT {
        @Override
        public String toString() {
            return "assignment context"; //$NON-NLS-1$
        }

        @Override
        public boolean definesTargetType() {
            return true;
        }
    },

    /** Invocation context: potential poly-expressions are: method invocations, lambdas, reference expressions, 
       conditional expressions and allocation expressions. At this point, we don't distinguish between strict 
       and loose invocation contexts - we may have to cross the bridge some day.
           
       Context induced by: AllocationExpression, QualifiedAllocationExpression, ExplicitConstructorCall, MessageSend
       CodeSnippetAllocationExpression and CodeSnippetMessageSend.
    */
    INVOCATION_CONTEXT {
        @Override
        public String toString() {
            return "invocation context"; //$NON-NLS-1$
        }

        @Override
        public boolean definesTargetType() {
            return true;
        }
    },

    /** Casting context: potential poly-expressions are: lambdas and reference expressions
       Context induced by: CastExpression.
    */
    CASTING_CONTEXT {
        @Override
        public String toString() {
            return "casting context"; //$NON-NLS-1$
        }

        @Override
        public boolean definesTargetType() {
            return false;
        }
    },

    /** Vanilla context (string, numeric): potential poly-expressions are: NONE. This is the nonpoly context in which 
       expressions get evaluated, unless they feature in one of the above contexts. 
    */
    VANILLA_CONTEXT {
        @Override
        public String toString() {
            return "vanilla context"; //$NON-NLS-1$
        }

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

    public abstract boolean definesTargetType();
}