// This Source Code is in the Public Domain per: http://unlicense.org
package org.litesoft.uispecification;

public enum ErrorChangeState {
    NoErrors_NoChanges( false, false ) {
        @Override
        public ErrorChangeState setErrors( boolean pYes ) {
            return pYes ? Errors_NoChanges : NoErrors_NoChanges;
        }

        @Override
        public ErrorChangeState setChanges( boolean pYes ) {
            return pYes ? NoErrors_Changes : NoErrors_NoChanges;
        }

        @Override
        public ErrorChangeState mergeToTrueFrom( ErrorChangeProvider pProvider ) {
            return setErrors( pProvider.isErrored() ).setChanges( pProvider.isChanged() );
        }
    }, //
    NoErrors_Changes( false, true ) {
        @Override
        public ErrorChangeState setErrors( boolean pYes ) {
            return pYes ? Errors_Changes : NoErrors_Changes;
        }

        @Override
        public ErrorChangeState setChanges( boolean pYes ) {
            return pYes ? NoErrors_Changes : NoErrors_NoChanges;
        }

        @Override
        public ErrorChangeState mergeToTrueFrom( ErrorChangeProvider pProvider ) {
            return setErrors( pProvider.isErrored() );
        }
    },//
    Errors_NoChanges( true, false ) {
        @Override
        public ErrorChangeState setErrors( boolean pYes ) {
            return pYes ? Errors_NoChanges : NoErrors_NoChanges;
        }

        @Override
        public ErrorChangeState setChanges( boolean pYes ) {
            return pYes ? Errors_Changes : Errors_NoChanges;
        }

        @Override
        public ErrorChangeState mergeToTrueFrom( ErrorChangeProvider pProvider ) {
            return setChanges( pProvider.isChanged() );
        }
    },//
    Errors_Changes( true, true ) {
        @Override
        public ErrorChangeState setErrors( boolean pYes ) {
            return pYes ? Errors_Changes : NoErrors_Changes;
        }

        @Override
        public ErrorChangeState setChanges( boolean pYes ) {
            return pYes ? Errors_Changes : Errors_NoChanges;
        }

        @Override
        public ErrorChangeState mergeToTrueFrom( ErrorChangeProvider pProvider ) {
            return this;
        }
    };

    private boolean mErrors, mChanges;

    private ErrorChangeState( boolean pErrors, boolean pChanges ) {
        mErrors = pErrors;
        mChanges = pChanges;
    }

    public boolean hasErrors() {
        return mErrors;
    }

    public boolean hasChanges() {
        return mChanges;
    }

    abstract public ErrorChangeState setErrors( boolean pYes );

    abstract public ErrorChangeState setChanges( boolean pYes );

    abstract public ErrorChangeState mergeToTrueFrom( ErrorChangeProvider pProvider );
}