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| package org.apache.hivemind.methodmatch; |
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| import java.util.ArrayList; |
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| import java.util.List; |
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| import org.apache.hivemind.ApplicationRuntimeException; |
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| import org.apache.hivemind.util.StringUtils; |
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| public class MethodPatternParser |
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| { |
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| private List _filters; |
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| |
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| public MethodFilter parseMethodPattern(String pattern)
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| { |
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| _filters = new ArrayList();
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| int parenx = pattern.indexOf('(');
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| String namePattern = parenx < 0 ? pattern : pattern.substring(0, parenx);
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| parseNamePattern(pattern, namePattern);
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| if (parenx >= 0)
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| parseParametersPattern(pattern, pattern.substring(parenx));
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| switch (_filters.size())
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| { |
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| case 0:
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| return new MatchAllFilter();
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| case 1:
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| return (MethodFilter) _filters.get(0);
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| default:
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| return new CompositeFilter(_filters);
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| } |
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| } |
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| private void parseNamePattern(String methodPattern, String namePattern)
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| { |
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| if (namePattern.equals("*"))
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| return;
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| if (namePattern.length() == 0)
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| throw new ApplicationRuntimeException(MethodMatchMessages
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| .missingNamePattern(methodPattern)); |
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| if (namePattern.startsWith("*") && namePattern.endsWith("*"))
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| { |
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| String substring = namePattern.substring(1, namePattern.length() - 1);
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| validateNamePattern(methodPattern, substring);
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| _filters.add(new InfixNameFilter(substring));
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| return;
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| } |
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| if (namePattern.startsWith("*"))
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| { |
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| String suffix = namePattern.substring(1);
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| validateNamePattern(methodPattern, suffix);
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| _filters.add(new NameSuffixFilter(suffix));
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| return;
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| } |
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| if (namePattern.endsWith("*"))
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| { |
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| String prefix = namePattern.substring(0, namePattern.length() - 1);
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| validateNamePattern(methodPattern, prefix);
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| _filters.add(new NamePrefixFilter(prefix));
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| return;
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| } |
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| validateNamePattern(methodPattern, namePattern);
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| _filters.add(new ExactNameFilter(namePattern));
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| } |
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| private void parseParametersPattern(String methodPattern, String pattern)
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| { |
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| if (pattern.equals("()"))
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| { |
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| addParameterCountFilter(0);
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| return;
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| } |
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| |
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| if (!pattern.endsWith(")"))
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| throw new ApplicationRuntimeException(MethodMatchMessages
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| .invalidParametersPattern(methodPattern)); |
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| pattern = pattern.substring(1, pattern.length() - 1);
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| char ch = pattern.charAt(0);
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| if (Character.isDigit(ch))
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| { |
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| addParameterCountFilter(methodPattern, pattern);
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| return;
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| } |
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| String[] names = StringUtils.split(pattern);
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| addParameterCountFilter(names.length);
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| for (int i = 0; i < names.length; i++)
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| _filters.add(new ParameterFilter(i, names[i].trim()));
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| } |
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| private void addParameterCountFilter(String methodPattern, String pattern)
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| { |
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| try
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| { |
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| int count = Integer.parseInt(pattern);
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| addParameterCountFilter(count);
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| } |
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| catch (NumberFormatException ex) |
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| { |
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| throw new ApplicationRuntimeException(MethodMatchMessages
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| .invalidParametersPattern(methodPattern)); |
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| } |
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| } |
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| private void addParameterCountFilter(int count)
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| { |
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| _filters.add(0, new ParameterCountFilter(count));
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| } |
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| private void validateNamePattern(String methodPattern, String nameSubstring)
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| { |
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| if (nameSubstring.indexOf('*') >= 0)
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| throw new ApplicationRuntimeException(MethodMatchMessages
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| .invalidNamePattern(methodPattern)); |
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| } |
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| } |