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/*******************************************************************************
* Copyright (c) 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;
/**
* Comparisons for magnitude.
*/
final class Compare extends Binary {
static IllegalArgumentException uncomparable(Object lval, Object rval) {
return new IllegalArgumentException("Cannot compare a " + lval.getClass().getName() + " to a " + rval.getClass().getName()); //$NON-NLS-1$//$NON-NLS-2$
}
final boolean compareLess;
final boolean equalOK;
Compare(Expression lhs, Expression rhs, boolean compareLess, boolean equalOK) {
super(lhs, rhs);
this.compareLess = compareLess;
this.equalOK = equalOK;
}
public Object evaluate(IEvaluationContext context) {
int cmpResult = CoercingComparator.coerceAndCompare(lhs.evaluate(context), rhs.evaluate(context));
return Boolean.valueOf(cmpResult == 0 ? equalOK : (cmpResult < 0 ? compareLess : !compareLess));
}
public int getExpressionType() {
return compareLess ? (equalOK ? TYPE_LESS_EQUAL : TYPE_LESS) : (equalOK ? TYPE_GREATER_EQUAL : TYPE_GREATER);
}
public String getOperator() {
return compareLess ? (equalOK ? OPERATOR_LT_EQUAL : OPERATOR_LT) : (equalOK ? OPERATOR_GT_EQUAL : OPERATOR_GT);
}
public void toLDAPString(StringBuffer buf) {
if (!equalOK)
buf.append("(!"); //$NON-NLS-1$
buf.append('(');
appendLDAPAttribute(buf);
if (equalOK)
buf.append(compareLess ? OPERATOR_LT_EQUAL : OPERATOR_GT_EQUAL);
else
buf.append(compareLess ? OPERATOR_GT_EQUAL : OPERATOR_LT_EQUAL);
appendLDAPValue(buf);
buf.append(')');
if (!equalOK)
buf.append(')');
}
}
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