


import org.apache.commons.lang.StringUtils;

import java.util.LinkedHashSet;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * 公式实体
 *
 * @author iBit程序猿
 */
public class FormulaEntity {

    /**
     * 默认变量前缀，#
     */
    private static final String DEFAULT_VARIABLE_PREFIX = "#";

    /**
     * 默认变量前缀正则
     */
    private static final String DEFAULT_VARIABLE_PREFIX_PATTERN = "([A-Za-z0-9_]+)";

    /**
     * 正则组1
     */
    private static final Integer VARIABLE_GROUP_1 = 1;

    /**
     * 公式key（等号左边部分）
     */
    private final String formulaKey;

    /**
     * 公式部分（等号右边部分）
     */
    private final String formulaPart;


    /**
     * 变量名称
     */
    private Set<String> variableNames;

    /**
     * 变量名称前缀
     */
    private final String variablePrefix;

    /**
     * 变量正则加前缀
     */
    private final String variablePatternWithPrefix;


    /**
     * 构造函数
     *
     * @param formulaKey  公式键（等号左边）
     * @param formulaPart 公式部分（等号右边）
     */
    public FormulaEntity(String formulaKey, String formulaPart) {
        this(null, formulaKey, formulaPart);
    }

    /**
     * 构造函数
     *
     * @param variablePrefix 变量前缀（标识变量）
     * @param formulaKey     公式键（等号左边）
     * @param formulaPart    公式部分（等号右边）
     */
    public FormulaEntity(String variablePrefix, String formulaKey, String formulaPart) {
        this.variablePrefix = StringUtils.isBlank(variablePrefix)? DEFAULT_VARIABLE_PREFIX : variablePrefix.trim();
        this.variablePatternWithPrefix = this.variablePrefix + DEFAULT_VARIABLE_PREFIX_PATTERN;
        this.formulaKey = removePrefix(formulaKey);
        this.formulaPart = removePrefix(formulaPart);
        initVariables(formulaPart);
    }

    /**
     * 删除变量前缀
     *
     * @param variableName 变量名称
     * @return 删除前缀后的变量名称
     */
    private String removePrefix(String variableName) {
        // 注意 '\u00A0' 特殊的空格
        return variableName.replace(variablePrefix, StringUtils.EMPTY)
               .replaceAll("\\s+", StringUtils.EMPTY)
               .replace("\u00A0", StringUtils.EMPTY);
    }

    /**
     * 初始化变量
     *
     * @param formula 公式
     */
    private void initVariables(String formula) {
        variableNames = new LinkedHashSet<>();
        Pattern pattern = Pattern.compile(variablePatternWithPrefix);
        Matcher matcher = pattern.matcher(formula);
        while (matcher.find()) {
            variableNames.add(matcher.group(VARIABLE_GROUP_1));
        }
    }

    /**
     * 获取公式key（等号左边部分）
     *
     * @return 公式key（等号左边部分）
     */
    public String getFormulaKey() {
        return formulaKey;
    }

    /**
     * 公式部分（等号右边部分）
     *
     * @return 公式部分（等号右边部分）
     */
    public String getFormulaPart() {
        return formulaPart;
    }

    /**
     * 获取变量名称（等号右边部分）
     *
     * @return 获取变量名称（等号右边部分）
     */
    public Set<String> getVariableNames() {
        return variableNames;
    }

    /**
     * 判断是否无变量名称
     *
     * @return 是否无变量名称
     */
    boolean isNoVariableNames() {
        return variableNames.isEmpty();
    }

    /**
     * 获取变量前缀
     *
     * @return 变量前缀
     */
    public String getVariablePrefix() {
        return variablePrefix;
    }
}
Exit Poll: If it is right we are in for a massive shock.
If the exit poll that has just been announced is right, we are heading for a Conservative Government. The exit poll has absolutely poleaxed political commentators and resulted in Kevin Maguire, from the Mirror, just tweeting the following line “Taxi for the polling industry”.
1) The Conservatives can, with just the Liberal Democrats, form a coalition that would mean they have a majority. 326 seats. They could invite the DUP to join them to get a bigger majority. It seems that the “Shy Tories” have come out of the woodwork and struck with a vengeance.
2) But, with 10 seats, the Lib Dems will probably not want to join the coalition, they will want to regroup. They may not have Nick Clegg as an MP anymore, and if he is one would imagine there might be a push to remove him as leader. So that leaves the DUP.
3) For Labour, it is just about their worst nightmare. 239 seats is way below anything they were considering, and makes it just about impossible for them to form a government. If this exit poll is true, after 5 million doorstep conversations and a campaign generally considered to be better than expected, they really need to take a very close look at themselves.
4) The main reason for the low number of seats Labour got is the SNP. Not only have the SNP got 58 seats, which means they only lost one seat in the entire country. What will happen now is anyone’s guess. Labour plus SNP = 297 seats and that won’t be enough, even if they add the small nationalist parties and the Greens. But still, you can bet those 58 SNP MPs will cause trouble.
5) UKIP will be disappointed, and the Greens may be too. It will be interesting to see what percentage of the vote each got to see just how much damage the vagaries of First Past the Post has done to them.
But, bear this in mind. This is all true if the exit poll is correct. Paddy Ashdown, the ex-leader of the Liberal Democrats, has just said that if the exit poll is right he will eat his hat. We’ll see.
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