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package jedi.assertion;

public class ErrorThrowingAssertionDelegate implements AssertionDelegate {

	public void assertTrue(boolean value, String message, Object... context) {
		if (!value) {
			throw new AssertionError(message + getContextAsString(context));
		}
	}

	private String getContextAsString(Object... context) {
		if (context == null || context.length == 0) {
			return "";
		}

		StringBuffer sb = new StringBuffer(256);
		sb.append(": context {");
		append(sb, context[0]);
		for (int i = 1; i < context.length; i++) {
			sb.append(", ");
			append(sb, context[i]);
		}
		sb.append("}");

		return sb.toString();
	}

	private void append(StringBuffer sb, Object obj) {
		sb.append('[');
		try {
			sb.append(obj);
		} catch (Exception ex) {
			sb.append(nonNullToString(obj)).append(".toString() threw ").append(ex.getClass().getName()).append("(\"").append(
					ex.getMessage()).append("\")");
		}
		sb.append(']');
	}

	private String nonNullToString(Object obj) {
		return obj.getClass().getName() + "@" + Integer.toHexString(System.identityHashCode(obj));
	}
}