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package org.eclipse.equinox.internal.p2.metadata.expression;
import java.util.List;
import org.eclipse.equinox.p2.metadata.expression.*;
public class ExpressionFactory implements IExpressionFactory, IExpressionConstants {
public static final IExpressionFactory INSTANCE = new ExpressionFactory();
public static final Variable THIS = new Variable(VARIABLE_THIS);
protected static Expression[] convertArray(IExpression[] operands) {
Expression[] ops = new Expression[operands.length];
System.arraycopy(operands, 0, ops, 0, operands.length);
return ops;
}
protected ExpressionFactory() {
// Maintain singleton
}
public IExpression all(IExpression collection, IExpression lambda) {
return new All((Expression) collection, (LambdaExpression) lambda);
}
public IExpression and(IExpression... operands) {
if (operands.length == 0)
return Literal.TRUE_CONSTANT;
if (operands.length == 1)
return operands[0];
return new And(convertArray(operands));
}
public IExpression at(IExpression target, IExpression key) {
return new At((Expression) target, (Expression) key);
}
@SuppressWarnings("unchecked")
public IExpression normalize(List<? extends IExpression> operands, int expressionType) {
return Expression.normalize((List<Expression>) operands, expressionType);
}
public IExpression constant(Object value) {
return Literal.create(value);
}
public IEvaluationContext createContext(Object... parameters) {
return EvaluationContext.create(parameters, (Variable[]) null);
}
public IEvaluationContext createContext(IExpression[] variables, Object... parameters) {
return EvaluationContext.create(parameters, variables);
}
public IFilterExpression filterExpression(IExpression expression) {
return new LDAPFilter((Expression) expression);
}
public IExpression equals(IExpression lhs, IExpression rhs) {
return new Equals((Expression) lhs, (Expression) rhs, false);
}
public IExpression exists(IExpression collection, IExpression lambda) {
return new Exists((Expression) collection, (LambdaExpression) lambda);
}
public IExpression greater(IExpression lhs, IExpression rhs) {
return new Compare((Expression) lhs, (Expression) rhs, false, false);
}
public IExpression greaterEqual(IExpression lhs, IExpression rhs) {
return new Compare((Expression) lhs, (Expression) rhs, false, true);
}
public IExpression indexedParameter(int index) {
return new Parameter(index);
}
public IExpression lambda(IExpression variable, IExpression body) {
return new LambdaExpression((Variable) variable, (Expression) body);
}
public IExpression less(IExpression lhs, IExpression rhs) {
return new Compare((Expression) lhs, (Expression) rhs, true, false);
}
public IExpression lessEqual(IExpression lhs, IExpression rhs) {
return new Compare((Expression) lhs, (Expression) rhs, true, true);
}
public IExpression matches(IExpression lhs, IExpression rhs) {
return new Matches((Expression) lhs, (Expression) rhs);
}
public <T> IMatchExpression<T> matchExpression(IExpression expression, Object... parameters) {
return new MatchExpression<T>((Expression) expression, parameters);
}
public IExpression member(IExpression target, String name) {
return new Member.DynamicMember((Expression) target, name);
}
public IExpression not(IExpression operand) {
if (operand instanceof Equals) {
Equals eq = (Equals) operand;
return new Equals(eq.lhs, eq.rhs, !eq.negate);
}
if (operand instanceof Compare) {
Compare cmp = (Compare) operand;
return new Compare(cmp.lhs, cmp.rhs, !cmp.compareLess, !cmp.equalOK);
}
if (operand instanceof Not)
return ((Not) operand).operand;
return new Not((Expression) operand);
}
public IExpression or(IExpression... operands) {
if (operands.length == 0)
return Literal.TRUE_CONSTANT;
if (operands.length == 1)
return operands[0];
return new Or(convertArray(operands));
}
public IExpression thisVariable() {
return THIS;
}
public IExpression variable(String name) {
if (VARIABLE_THIS.equals(name))
return THIS;
return new Variable(name);
}
}
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