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There is a newer version: 7.14.4

package com.enonic.xp.form;


import com.google.common.base.Preconditions;

import com.enonic.xp.annotation.PublicApi;

import static com.google.common.base.Strings.nullToEmpty;

@PublicApi
public abstract class Layout
    extends FormItem
{
    private final String name;

    Layout( final String name )
    {
        Preconditions.checkNotNull( name, "a name is required for a Layout" );
        Preconditions.checkArgument( !nullToEmpty( name ).isBlank(), "a name is required for a Layout" );
        Preconditions.checkArgument( !name.contains( "." ), "name cannot contain punctuations: " + name );
        this.name = name;
    }

    @Override
    public String getName()
    {
        return this.name;
    }

    @Override
    public FormItemType getType()
    {
        return FormItemType.LAYOUT;
    }

    @Override
    FormItemPath resolvePath()
    {
        return resolveParentPath();
    }

    public abstract FormItem getFormItem( String name );
}