com.github.datalking.web.mvc.condition.ParamsRequestCondition Maven / Gradle / Ivy

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

import com.github.datalking.util.web.WebUtils;

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

/**
 * @author yaoo on 4/28/18
 */
public class ParamsRequestCondition extends AbstractRequestCondition {

    private final Set expressions;

    public ParamsRequestCondition(String... params) {
        this(parseExpressions(params));
    }

    private ParamsRequestCondition(Collection conditions) {
        this.expressions = Collections.unmodifiableSet(new LinkedHashSet<>(conditions));
    }

    private static Collection parseExpressions(String... params) {
        Set expressions = new LinkedHashSet<>();
        if (params != null) {
            for (String param : params) {
                expressions.add(new ParamExpression(param));
            }
        }
        return expressions;
    }

    public Set> getExpressions() {
        return new LinkedHashSet<>(this.expressions);
    }

    @Override
    protected Collection getContent() {
        return this.expressions;
    }

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

    public ParamsRequestCondition combine(ParamsRequestCondition other) {
        Set set = new LinkedHashSet<>(this.expressions);
        set.addAll(other.expressions);
        return new ParamsRequestCondition(set);
    }

    public ParamsRequestCondition getMatchingCondition(HttpServletRequest request) {
        for (ParamExpression expression : expressions) {
            if (!expression.match(request)) {
                return null;
            }
        }
        return this;
    }

    public int compareTo(ParamsRequestCondition other, HttpServletRequest request) {
        return (other.expressions.size() - this.expressions.size());
    }

    static class ParamExpression extends AbstractNameValueExpression {

        ParamExpression(String expression) {
            super(expression);
        }

        @Override
        protected String parseValue(String valueExpression) {
            return valueExpression;
        }

        @Override
        protected boolean matchName(HttpServletRequest request) {
            return WebUtils.hasSubmitParameter(request, name);
        }

        @Override
        protected boolean matchValue(HttpServletRequest request) {
            return value.equals(request.getParameter(name));
        }
    }

}