/*   Copyright 2004 The Apache Software Foundation
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.apache.xmlbeans.impl.common;

import org.apache.xmlbeans.XmlError;

import java.util.AbstractCollection;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;

public class XmlErrorWatcher extends AbstractCollection<XmlError> {
    private final Collection<XmlError> _underlying;
    private XmlError _firstError;

    public XmlErrorWatcher(Collection<XmlError> underlying) {
        _underlying = underlying;
    }

    @Override
    public boolean add(XmlError o) {
        if (_firstError == null && o != null && o.getSeverity() == XmlError.SEVERITY_ERROR) {
            _firstError = o;
        }
        if (_underlying == null) {
            return false;
        }
        return _underlying.add(o);
    }

    @Override
    public Iterator<XmlError> iterator() {
        if (_underlying == null) {
            return Collections.emptyIterator();
        }

        return _underlying.iterator();
    }

    @Override
    public int size() {
        if (_underlying == null) {
            return 0;
        }

        return _underlying.size();
    }

    public boolean hasError() {
        return _firstError != null;
    }

    public XmlError firstError() {
        return _firstError;
    }
}
