| /******************************************************************************* |
| * Copyright (c) 2009, 2010 Cloudsmith Inc. and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Cloudsmith Inc. - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.equinox.internal.p2.metadata.expression; |
| |
| import org.eclipse.equinox.p2.metadata.expression.IEvaluationContext; |
| |
| /** |
| * An expression that performs the == and != comparisons |
| */ |
| final class Equals extends Binary { |
| final boolean negate; |
| |
| Equals(Expression lhs, Expression rhs, boolean negate) { |
| super(lhs, rhs); |
| this.negate = negate; |
| } |
| |
| public Object evaluate(IEvaluationContext context) { |
| boolean result = CoercingComparator.coerceAndEquals(lhs.evaluate(context), rhs.evaluate(context)); |
| if (negate) |
| result = !result; |
| return Boolean.valueOf(result); |
| } |
| |
| public int getExpressionType() { |
| return negate ? TYPE_NOT_EQUALS : TYPE_EQUALS; |
| } |
| |
| public String getOperator() { |
| return negate ? OPERATOR_NOT_EQUALS : OPERATOR_EQUALS; |
| } |
| |
| public void toLDAPString(StringBuffer buf) { |
| if (negate) |
| buf.append("(!"); //$NON-NLS-1$ |
| buf.append('('); |
| appendLDAPAttribute(buf); |
| buf.append('='); |
| appendLDAPValue(buf); |
| buf.append(')'); |
| if (negate) |
| buf.append(')'); |
| } |
| } |