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package com.davfx.string;

final class BeforeStringInput implements StringInput {
	private final StringInput separator;
	private final StringInput wrappee;

	public BeforeStringInput(StringInput separator, StringInput wrappee) {
		this.separator = separator;
		this.wrappee = wrappee;
	}
	@Override
	public String get(T h) {
		String s = wrappee.get(h);
		if (s == null) {
			return null;
		}
		String sep = separator.get(h);
		if (sep == null) {
			return null;
		}
		int k = s.indexOf(sep);
		if (k < 0) {
			return null;
		}
		return s.substring(0, k);
	}
}