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/*******************************************************************************
* Copyright (c) 2009, 2017 Cloudsmith Inc. 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:
* Cloudsmith Inc. - initial API and implementation
*******************************************************************************/
package org.eclipse.equinox.internal.p2.metadata.expression;
import java.util.Iterator;
import java.util.NoSuchElementException;
import org.eclipse.equinox.p2.metadata.expression.IEvaluationContext;
/**
* An array of expressions
*/
final class Array extends NAry {
final class ArrayIterator implements Iterator<Object> {
private final IEvaluationContext context;
private int pos = -1;
public ArrayIterator(IEvaluationContext context) {
this.context = context;
}
@Override
public boolean hasNext() {
return pos + 1 < operands.length;
}
@Override
public Object next() {
if (++pos >= operands.length) {
--pos;
throw new NoSuchElementException();
}
return operands[pos].evaluate(context);
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
}
Array(Expression[] operands) {
super(assertLength(operands, 0, OPERATOR_ARRAY));
}
@Override
public Object evaluate(IEvaluationContext context) {
return evaluateAsIterator(context);
}
@Override
public Iterator<?> evaluateAsIterator(IEvaluationContext context) {
return new ArrayIterator(context);
}
@Override
public int getExpressionType() {
return TYPE_ARRAY;
}
@Override
public void toString(StringBuffer bld, Variable rootVariable) {
bld.append('[');
elementsToString(bld, rootVariable, operands);
bld.append(']');
}
@Override
public String getOperator() {
return OPERATOR_ARRAY;
}
@Override
public int getPriority() {
return PRIORITY_FUNCTION;
}
}
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