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package org.apache.camel.language.simple; |
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import org.apache.camel.Exchange; |
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import org.apache.camel.Expression; |
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import org.apache.camel.Predicate; |
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import org.apache.camel.builder.ExpressionBuilder; |
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import org.apache.camel.builder.PredicateBuilder; |
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import org.apache.camel.language.IllegalSyntaxException; |
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import org.apache.camel.spi.Language; |
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import org.apache.camel.util.ObjectHelper; |
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public class SimpleLanguage implements Language { |
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public Predicate<Exchange> createPredicate(String expression) { |
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return PredicateBuilder.toPredicate(createExpression(expression)); |
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} |
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public Expression<Exchange> createExpression(String expression) { |
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if (ObjectHelper.isEqualToAny(expression, "body", "in.body")) { |
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return ExpressionBuilder.bodyExpression(); |
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} else if (ObjectHelper.equals(expression, "out.body")) { |
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return ExpressionBuilder.outBodyExpression(); |
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} |
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String remainder = ifStartsWithReturnRemainder("in.header.", expression); |
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if (remainder == null) { |
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remainder = ifStartsWithReturnRemainder("header.", expression); |
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} |
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if (remainder != null) { |
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return ExpressionBuilder.headerExpression(remainder); |
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} |
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remainder = ifStartsWithReturnRemainder("out.header.", expression); |
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if (remainder != null) { |
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return ExpressionBuilder.outHeaderExpression(remainder); |
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} |
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remainder = ifStartsWithReturnRemainder("property.", expression); |
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if (remainder != null) { |
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return ExpressionBuilder.propertyExpression(remainder); |
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} |
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remainder = ifStartsWithReturnRemainder("sys.", expression); |
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if (remainder != null) { |
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return ExpressionBuilder.propertyExpression(remainder); |
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} |
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throw new IllegalSyntaxException(this, expression); |
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} |
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protected String ifStartsWithReturnRemainder(String prefix, String text) { |
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if (text.startsWith(prefix)) { |
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String remainder = text.substring(prefix.length()); |
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if (remainder.length() > 0) { |
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return remainder; |
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} |
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} |
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return null; |
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} |
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} |