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/*
 * The contents of this file are subject to the terms
 * of the Common Development and Distribution License
 * (the "License").  You may not use this file except
 * in compliance with the License.
 *
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package org.glassfish.jersey.server.model;

import java.util.List;

/**
 * An abstract resource model validator.
 *
 * This base resource model validator class implements the visitor pattern to
 * traverse through all the {@link ResourceModelComponent resource model components}
 * to check validity of a resource model.
 * 
 * This validator maintains a list of all the {@link ResourceModelIssue issues}
 * found in the model. That way all the resource model components can be validated
 * in a single call to the {@link #validate(ResourceModelComponent) validate(...)}
 * method and collect all the validation issues from the model.
 *
 * @author Jakub Podlesak (jakub.podlesak at oracle.com)
 * @author Marek Potociar (marek.potociar at oracle.com)
 */
public abstract class ResourceModelValidator implements ResourceModelVisitor {

    private final List issueList;

    public ResourceModelValidator(final List issueList) {
        this.issueList = issueList;
    }

    /**
     * Returns a list of issues found after
     * {@link #validate(org.glassfish.jersey.server.model.ResourceModelComponent)}
     * method has been invoked.
     *
     * @return a non-null list of issues.
     */
    public List getIssueList() {
        return issueList;
    }

    protected final void addFatalIssue(Object source, String message) {
        issueList.add(new ResourceModelIssue(source, message, true));
    }

    protected final void addMinorIssue(Object source, String message) {
        issueList.add(new ResourceModelIssue(source, message, false));
    }

    /**
     * Convenience method to see if there were fatal issues found.
     *
     * @return {@code true} if there are any fatal issues present in the current
     *         issue list.
     */
    public boolean fatalIssuesFound() {
        for (ResourceModelIssue issue : getIssueList()) {
            if (issue.isFatal()) {
                return true;
            }
        }
        return false;
    }

    /**
     * Removes all issues from the current issue list. The method could be used
     * to re-use the same ResourceModelValidator for another resource model.
     */
    public void cleanIssueList() {
        issueList.clear();
    }

    /**
     * The validate method validates a component and adds possible
     * issues found to it's list. The list of issues could be then retrieved
     * via getIssueList method.
     *
     * @param component resource model component.
     */
    public void validate(final ResourceModelComponent component) {
        component.accept(this);
        List componentList = component.getComponents();
        if (null != componentList) {
            for (ResourceModelComponent subComponent : componentList) {
                validate(subComponent);
            }
        }
    }
}