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/*
 * Copyright (c) 2010 Mysema Ltd.
 * All rights reserved.
 * 
 */
package com.mysema.rdfbean.model;

import javax.annotation.Nullable;
import javax.annotation.concurrent.Immutable;

import com.google.common.base.Objects;

/**
 * @author sasa
 * 
 */
@Immutable
public final class STMTMatcher {

    @Nullable
    private final ID subject;

    @Nullable
    private final UID predicate;

    @Nullable
    private final NODE object;

    @Nullable
    private final UID context;

    private final boolean includeInferred;

    public STMTMatcher(@Nullable ID subject, @Nullable UID predicate, @Nullable NODE object, @Nullable UID context,
            boolean includeInferred) {
        super();
        this.subject = subject;
        this.predicate = predicate;
        this.object = object;
        this.context = context;
        this.includeInferred = includeInferred;
    }

    @Nullable
    public ID getSubject() {
        return subject;
    }

    @Nullable
    public UID getPredicate() {
        return predicate;
    }

    @Nullable
    public NODE getObject() {
        return object;
    }

    @Nullable
    public UID getContext() {
        return context;
    }

    public boolean isIncludeInferred() {
        return includeInferred;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((subject == null) ? 0 : subject.hashCode());
        result = prime * result + ((predicate == null) ? 0 : predicate.hashCode());
        result = prime * result + ((object == null) ? 0 : object.hashCode());
        result = prime * result + ((context == null) ? 0 : context.hashCode());
        result = prime * result + (includeInferred ? 1231 : 1237);
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        } else if (obj instanceof STMTMatcher) {
            STMTMatcher other = (STMTMatcher) obj;

            // s
            if (!Objects.equal(subject, other.subject)) {
                return false;
                // p
            } else if (!Objects.equal(predicate, other.predicate)) {
                return false;
                // o
            } else if (!Objects.equal(object, other.object)) {
                return false;
                // c
            } else if (!Objects.equal(context, other.context)) {
                return false;
            }

            if (includeInferred != other.includeInferred) {
                return false;
            }

            return true;

        } else {
            return false;
        }
    }

    public static boolean matches(STMT stmt, ID subject, UID predicate, NODE object, UID context, boolean includeInferred) {
        return
        // Subject match
        (subject == null || subject.equals(stmt.getSubject())) &&

                // Predicate match
                (predicate == null || predicate.equals(stmt.getPredicate())) &&

                // Object match
                (object == null || object.equals(stmt.getObject())) &&

                // Context match
                (context == null || context.equals(stmt.getContext())) &&

                // Asserted or includeInferred statement
                (includeInferred || stmt.isAsserted());
    }

    public boolean matches(STMT stmt) {
        return matches(stmt, subject, predicate, object, context, includeInferred);
    }
}