Android Open Source - NexusData Compound Predicate

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License

The source code is released under:

Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCT...

Java Source Code

package com.github.dkharrat.nexusdata.predicate;
/* ww  w .ja  v  a 2s . c  om*/

public class CompoundPredicate implements Predicate {
    public static enum Operator {
        AND,
        OR,
    }

    private final Predicate lhs, rhs;
    private final Operator op;

    public CompoundPredicate(Predicate lhs, Operator op, Predicate rhs) {
        this.lhs = lhs;
        this.op = op;
        this.rhs = rhs;
    }

    public Predicate getLhs() {
        return lhs;
    }

    public Operator getOperator() {
        return op;
    }

    public Predicate getRhs() {
        return rhs;
    }

    @Override
    public <T> T accept(ExpressionVisitor<T> visitor) {
        return visitor.visit(this);
    }

    @Override
    public Boolean evaluate(Object object) {
        boolean lhsValue = lhs.evaluate(object);
        boolean rhsValue = rhs.evaluate(object);

        switch (op) {
            case AND:
                return lhsValue && rhsValue;
            case OR:
                return lhsValue || rhsValue;
            default:
                throw new UnsupportedOperationException("Unsupported compound operator: " + op);
        }
    }

    @Override
    public String toString() {
        return "(" + lhs + " " + op + " " + rhs + ")";
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        CompoundPredicate that = (CompoundPredicate) o;

        if (!lhs.equals(that.lhs)) return false;
        if (op != that.op) return false;
        if (!rhs.equals(that.rhs)) return false;

        return true;
    }

    @Override
    public int hashCode() {
        int result = lhs.hashCode();
        result = 31 * result + rhs.hashCode();
        result = 31 * result + op.hashCode();
        return result;
    }
}

Java Source Code List

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