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/*******************************************************************************
* 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(')');
}
}
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