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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 org.eclipse.equinox.p2.metadata.expression.IEvaluationContext;
import org.eclipse.equinox.p2.metadata.expression.IExpressionVisitor;
/**
* A function that executes some code
*/
final class CurryedLambdaExpression extends LambdaExpression {
private static final Assignment[] emptyAssignmentArray = new Assignment[0];
private final Assignment[] assignments;
CurryedLambdaExpression(Variable each, Assignment[] assignments, Expression body) {
super(each, body);
if (assignments == null)
assignments = emptyAssignmentArray;
this.assignments = assignments;
}
@Override
public boolean accept(IExpressionVisitor visitor) {
if (super.accept(visitor) && each.accept(visitor)) {
for (int idx = 0; idx < assignments.length; ++idx)
if (!assignments[idx].accept(visitor))
return false;
return true;
}
return false;
}
@Override
public int compareTo(Expression e) {
int cmp = super.compareTo(e);
if (cmp == 0)
cmp = compare(assignments, ((CurryedLambdaExpression) e).assignments);
return cmp;
}
@Override
public boolean equals(Object o) {
return super.equals(o) && equals(assignments, ((CurryedLambdaExpression) o).assignments);
}
@Override
public int hashCode() {
return 31 * super.hashCode() + hashCode(assignments);
}
@Override
public void toString(StringBuffer bld, Variable rootVariable) {
int top = assignments.length;
if (top > 0) {
for (int idx = 0; idx < top; ++idx) {
appendOperand(bld, rootVariable, assignments[idx].rhs, IExpressionConstants.PRIORITY_COMMA);
bld.append(", "); //$NON-NLS-1$
}
bld.append(OPERATOR_EACH);
bld.append(", {"); //$NON-NLS-1$
for (int idx = 0; idx < top; ++idx) {
appendOperand(bld, rootVariable, assignments[idx].lhs, IExpressionConstants.PRIORITY_COMMA);
bld.append(", "); //$NON-NLS-1$
}
}
super.toString(bld, rootVariable);
if (top > 0)
bld.append('}');
}
@Override
public IEvaluationContext prolog(IEvaluationContext context) {
IEvaluationContext lambdaContext;
int top = assignments.length + 1;
Variable[] vars = new Variable[top];
vars[0] = getItemVariable();
for (int idx = 1; idx < top; ++idx)
vars[idx] = (Variable) assignments[idx - 1].lhs;
lambdaContext = EvaluationContext.create(context, vars);
for (int idx = 1; idx < top; ++idx)
lambdaContext.setValue(vars[idx], assignments[idx - 1].rhs.evaluate(context));
return lambdaContext;
}
@Override
int countAccessToEverything() {
int cnt = 0;
for (int idx = 0; idx < assignments.length; ++idx)
cnt += assignments[idx].countAccessToEverything();
cnt += super.countAccessToEverything();
return cnt;
}
}
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