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package org.apache.camel.builder; |
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import org.apache.camel.Exchange; |
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import org.apache.camel.Expression; |
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import java.util.ArrayList; |
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import java.util.List; |
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import java.util.StringTokenizer; |
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import java.util.Arrays; |
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import java.util.regex.Pattern; |
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public class ExpressionBuilder { |
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public static <E extends Exchange> Expression<E> headerExpression(final String headerName) { |
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return new Expression<E>() { |
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public Object evaluate(E exchange) { |
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Object header = exchange.getIn().getHeader(headerName); |
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if (header == null) { |
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header = exchange.getProperty(headerName); |
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} |
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return header; |
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} |
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@Override |
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public String toString() { |
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return "header(" + headerName + ")"; |
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} |
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}; |
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} |
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public static <E extends Exchange> Expression<E> propertyExpression(final String propertyName) { |
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return new Expression<E>() { |
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public Object evaluate(E exchange) { |
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return exchange.getProperty(propertyName); |
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} |
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@Override |
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public String toString() { |
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return "property(" + propertyName + ")"; |
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} |
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}; |
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} |
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public static <E extends Exchange> Expression<E> constantExpression(final Object value) { |
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return new Expression<E>() { |
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public Object evaluate(E exchange) { |
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return value; |
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} |
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@Override |
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public String toString() { |
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return "" + value; |
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} |
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}; |
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} |
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public static <E extends Exchange> Expression<E> bodyExpression() { |
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return new Expression<E>() { |
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public Object evaluate(E exchange) { |
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return exchange.getIn().getBody(); |
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} |
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@Override |
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public String toString() { |
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return "body"; |
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} |
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}; |
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} |
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public static <E extends Exchange, T> Expression<E> bodyExpression(final Class<T> type) { |
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return new Expression<E>() { |
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public Object evaluate(E exchange) { |
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return exchange.getIn().getBody(type); |
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} |
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@Override |
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public String toString() { |
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return "bodyAs[" + type.getName() + "]"; |
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} |
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}; |
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} |
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public static <E extends Exchange> Expression<E> outBodyExpression() { |
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return new Expression<E>() { |
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public Object evaluate(E exchange) { |
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return exchange.getOut().getBody(); |
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} |
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@Override |
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public String toString() { |
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return "outBody"; |
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} |
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}; |
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} |
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public static <E extends Exchange> Expression<E> exchangeExpression() { |
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return new Expression<E>() { |
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public Object evaluate(E exchange) { |
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return exchange; |
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} |
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@Override |
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public String toString() { |
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return "exchange"; |
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} |
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}; |
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} |
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public static <E extends Exchange> Expression<E> inMessageExpression() { |
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return new Expression<E>() { |
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public Object evaluate(E exchange) { |
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return exchange.getIn(); |
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} |
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@Override |
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public String toString() { |
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return "inMessage"; |
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} |
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}; |
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} |
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public static <E extends Exchange> Expression<E> convertTo(final Expression expression, final Class type) { |
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return new Expression<E>() { |
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public Object evaluate(E exchange) { |
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Object value = expression.evaluate(exchange); |
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return exchange.getContext().getTypeConverter().convertTo(type, value); |
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} |
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@Override |
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public String toString() { |
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return "convertTo(" + expression + ", " + type + ")"; |
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} |
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}; |
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} |
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public static <E extends Exchange> Expression<E> tokenizeExpression(final Expression<E> expression, final String token) { |
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return new Expression<E>() { |
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public Object evaluate(E exchange) { |
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String text = evaluateStringExpression(expression, exchange); |
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if (text == null) { |
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return null; |
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} |
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StringTokenizer iter = new StringTokenizer(text, token); |
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List<String> answer = new ArrayList<String>(); |
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while (iter.hasMoreTokens()) { |
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answer.add(iter.nextToken()); |
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} |
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return answer; |
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} |
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@Override |
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public String toString() { |
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return "tokenize(" + expression + ", " + token + ")"; |
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} |
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}; |
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} |
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public static <E extends Exchange> Expression<E> regexTokenize(final Expression<E> expression, String regexTokenizer) { |
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final Pattern pattern = Pattern.compile(regexTokenizer); |
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return new Expression<E>() { |
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public Object evaluate(E exchange) { |
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String text = evaluateStringExpression(expression, exchange); |
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if (text == null) { |
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return null; |
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} |
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return Arrays.asList(pattern.split(text)); |
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} |
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@Override |
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public String toString() { |
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return "regexTokenize(" + expression + ", " + pattern.pattern() + ")"; |
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} |
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}; |
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} |
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public static <E extends Exchange> Expression<E> regexReplaceAll(final Expression<E> expression, String regex, final String replacement) { |
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final Pattern pattern = Pattern.compile(regex); |
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return new Expression<E>() { |
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public Object evaluate(E exchange) { |
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String text = evaluateStringExpression(expression, exchange); |
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if (text == null) { |
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return null; |
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} |
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return pattern.matcher(text).replaceAll(replacement); |
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} |
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@Override |
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public String toString() { |
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return "regexReplaceAll(" + expression + ", " + pattern.pattern() + ")"; |
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} |
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}; |
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} |
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public static <E extends Exchange> Expression<E> regexReplaceAll(final Expression<E> expression, String regex, final Expression<E> replacementExpression) { |
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final Pattern pattern = Pattern.compile(regex); |
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return new Expression<E>() { |
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public Object evaluate(E exchange) { |
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String text = evaluateStringExpression(expression, exchange); |
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String replacement = evaluateStringExpression(replacementExpression, exchange);; |
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if (text == null || replacement == null) { |
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return null; |
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} |
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return pattern.matcher(text).replaceAll(replacement); |
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} |
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@Override |
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public String toString() { |
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return "regexReplaceAll(" + expression + ", " + pattern.pattern() + ")"; |
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} |
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}; |
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} |
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public static <E extends Exchange> Expression<E> append(final Expression<E> left, final Expression<E> right) { |
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return new Expression<E>() { |
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public Object evaluate(E exchange) { |
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return evaluateStringExpression(left, exchange) + evaluateStringExpression(right, exchange); |
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} |
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@Override |
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public String toString() { |
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return "append(" + left + ", " + right + ")"; |
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} |
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}; |
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} |
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public static <E extends Exchange> String evaluateStringExpression(Expression<E> expression, E exchange) { |
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Object value = expression.evaluate(exchange); |
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return exchange.getContext().getTypeConverter().convertTo(String.class, value); |
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} |
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public static <E extends Exchange> Expression<E> systemProperty(final String name) { |
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return systemProperty(name, null); |
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} |
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public static <E extends Exchange> Expression<E> systemProperty(final String name, final String defaultValue) { |
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return new Expression<E>() { |
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public Object evaluate(E exchange) { |
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return System.getProperty(name, defaultValue); |
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} |
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}; |
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} |
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} |