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/*******************************************************************************
* Copyright (c) 2009, 2017 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 java.util.Iterator;
import org.eclipse.equinox.p2.metadata.expression.IEvaluationContext;
/**
* An expression representing a variable stack in the current thread.
*/
public class Variable extends Expression {
private final String name;
public Variable(String name) {
this.name = name;
}
@Override
public int compareTo(Expression e) {
int cmp = super.compareTo(e);
if (cmp == 0)
cmp = name.compareTo(((Variable) e).name);
return cmp;
}
@Override
public boolean equals(Object o) {
return super.equals(o) && name.equals(((Variable) o).name);
}
@Override
public final Object evaluate(IEvaluationContext context) {
return context.getValue(this);
}
@Override
public Iterator<?> evaluateAsIterator(IEvaluationContext context) {
Object value = context.getValue(this);
if (value instanceof IRepeatableIterator<?>)
return ((IRepeatableIterator<?>) value).getCopy();
Iterator<?> itor = RepeatableIterator.create(value);
setValue(context, itor);
return itor;
}
@Override
public int getExpressionType() {
return TYPE_VARIABLE;
}
public String getName() {
return name;
}
@Override
public String getOperator() {
return "<variable>"; //$NON-NLS-1$
}
@Override
public int getPriority() {
return PRIORITY_VARIABLE;
}
@Override
public int hashCode() {
return name.hashCode();
}
public final void setValue(IEvaluationContext context, Object value) {
context.setValue(this, value);
}
@Override
public void toString(StringBuffer bld, Variable rootVariable) {
bld.append(name);
}
@Override
int countAccessToEverything() {
return this == ExpressionFactory.EVERYTHING ? 1 : 0;
}
}
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