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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.*;
import org.eclipse.equinox.internal.p2.metadata.InstallableUnit;
import org.eclipse.equinox.internal.p2.metadata.expression.Member.DynamicMember;
import org.eclipse.equinox.p2.metadata.IInstallableUnit;
import org.eclipse.equinox.p2.metadata.expression.IEvaluationContext;
import org.eclipse.equinox.p2.metadata.index.IIndexProvider;
/**
* This class represents indexed or keyed access to an indexed collection
* or a map.
*/
class At extends Binary {
protected At(Expression lhs, Expression rhs) {
super(lhs, rhs);
}
@Override
public Object evaluate(org.eclipse.equinox.p2.metadata.expression.IEvaluationContext context) {
Object lval;
if (lhs instanceof DynamicMember) {
DynamicMember lm = (DynamicMember) lhs;
Object instance = lm.operand.evaluate(context);
if (instance instanceof IInstallableUnit) {
String name = lm.getName();
if (InstallableUnit.MEMBER_TRANSLATED_PROPERTIES == name || InstallableUnit.MEMBER_PROFILE_PROPERTIES == name) {
IIndexProvider<?> indexProvider = context.getIndexProvider();
if (indexProvider == null)
throw new UnsupportedOperationException("No managed properties available to QL"); //$NON-NLS-1$
return indexProvider.getManagedProperty(instance, name, rhs.evaluate(context));
}
if (InstallableUnit.MEMBER_PROPERTIES == name) {
// Avoid full copy of the properties map just to get one member
return ((IInstallableUnit) instance).getProperty((String) rhs.evaluate(context));
}
}
lval = lm.invoke(instance);
} else
lval = lhs.evaluate(context);
Object rval = rhs.evaluate(context);
if (lval == null)
throw new IllegalArgumentException("Unable to use [] on null"); //$NON-NLS-1$
if (lval instanceof Map<?, ?>)
return ((Map<?, ?>) lval).get(rval);
if (rval instanceof Number) {
if (lval instanceof List<?>)
return ((List<?>) lval).get(((Number) rval).intValue());
if (lval != null && lval.getClass().isArray())
return ((Object[]) lval)[((Number) rval).intValue()];
}
if (lval instanceof Dictionary<?, ?>)
return ((Dictionary<?, ?>) lval).get(rval);
throw new IllegalArgumentException("Unable to use [] on a " + lval.getClass().getName()); //$NON-NLS-1$
}
@Override
public Iterator<?> evaluateAsIterator(IEvaluationContext context) {
Object value = evaluate(context);
if (!(value instanceof Iterator<?>))
value = RepeatableIterator.create(value);
return (Iterator<?>) value;
}
@Override
public int getExpressionType() {
return TYPE_AT;
}
@Override
public void toString(StringBuffer bld, Variable rootVariable) {
appendOperand(bld, rootVariable, lhs, getPriority());
bld.append('[');
appendOperand(bld, rootVariable, rhs, PRIORITY_MAX);
bld.append(']');
}
@Override
public String getOperator() {
return OPERATOR_AT;
}
@Override
public int getPriority() {
return PRIORITY_MEMBER;
}
}
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