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package org.netbeans.validation.api;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * A collection of problems, to which a Validator can add additional problems.
 *
 * @author Tim Boudreau
 */
public final class Problems {
    private final List<Problem> problems = new ArrayList<Problem>();
    private boolean hasFatal;
    /**
     * Convenience method to add a problem with the specified message and
     * Severity.FATAL
     * @param problem
     */
    public final void add (String problem) {
        add (problem, Severity.FATAL);
    }

    /**
     * Add a problem with the specified severity
     * @param problem the message
     * @param severity the severity
     */
    public final void add (String problem, Severity severity) {
        problems.add (new Problem (problem, severity));
        hasFatal |= severity == Severity.FATAL;
    }

    /**
     * Add a problem
     * @param problem The problem
     */
    public final void add (Problem problem) {
        problems.add (problem);
    }

    /**
     * Dump all problems in another instance of Problems into this one.
     * @param problems The other problems.
     */
    public final void putAll (Problems problems) {
        if (problems == this) throw new IllegalArgumentException (
                "putAll to self"); //NOI18N
        this.problems.addAll (problems.problems);
    }

    /**
     * Determine if this set of problems is empty
     * @return true if there are no problems here
     */
    public final boolean isEmpty() {
        return this.problems.isEmpty();
    }

    /**
     * Determine if this set of problems includes any that are fatal.
     * @return true if a fatal problem has been encountered
     */
    public final boolean hasFatal() {
        return hasFatal;
    }

    /**
     * Get the first problem of the highest severity
     *
     * @return The most severe problem in this set
     */
    public final Problem getLeadProblem() {
        Collections.sort (problems);
        return problems.isEmpty() ? null :
            problems.get(problems.size() - 1);
    }

    public String toString() {
        return problems.toString();
    }
}