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    • com.github.datalking.web.mvc.condition.RequestConditionHolder Maven / Gradle / Ivy

    package com.github.datalking.web.mvc.condition;

import javax.servlet.http.HttpServletRequest;
import java.util.Collection;
import java.util.Collections;

/**
 */
public class RequestConditionHolder extends AbstractRequestCondition {

	private final RequestCondition condition;


	public RequestConditionHolder(RequestCondition requestCondition) {
		this.condition = (RequestCondition) requestCondition;
	}


	public RequestCondition getCondition() {
		return this.condition;
	}

	@Override
	protected Collection getContent() {
		return (this.condition != null ? Collections.singleton(this.condition) : Collections.emptyList());
	}

	@Override
	protected String getToStringInfix() {
		return " ";
	}


	public RequestConditionHolder combine(RequestConditionHolder other) {
		if (this.condition == null && other.condition == null) {
			return this;
		}
		else if (this.condition == null) {
			return other;
		}
		else if (other.condition == null) {
			return this;
		}
		else {
			assertEqualConditionTypes(other);
			RequestCondition combined = (RequestCondition) this.condition.combine(other.condition);
			return new RequestConditionHolder(combined);
		}
	}

	/**
	 * Ensure the held request conditions are of the same type.
	 */
	private void assertEqualConditionTypes(RequestConditionHolder other) {
		Class clazz = this.condition.getClass();
		Class otherClazz = other.condition.getClass();
		if (!clazz.equals(otherClazz)) {
			throw new ClassCastException("Incompatible request conditions: " + clazz + " and " + otherClazz);
		}
	}


	public RequestConditionHolder getMatchingCondition(HttpServletRequest request) {
		if (this.condition == null) {
			return this;
		}
		RequestCondition match = (RequestCondition) this.condition.getMatchingCondition(request);
		return (match != null ? new RequestConditionHolder(match) : null);
	}


	public int compareTo(RequestConditionHolder other, HttpServletRequest request) {
		if (this.condition == null && other.condition == null) {
			return 0;
		}
		else if (this.condition == null) {
			return 1;
		}
		else if (other.condition == null) {
			return -1;
		}
		else {
			assertEqualConditionTypes(other);
			return this.condition.compareTo(other.condition, request);
		}
	}

}
    
    
    
    

    




    
    
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